Walter Herzog

Summary

Affiliation: University of Calgary
Country: Canada

Publications

  1. doi request reprint Residual force enhancement exceeds the isometric force at optimal sarcomere length for optimized stretch conditions
    Eun Jeong Lee
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 Univ Dr NW, Calgary, AB, Canada T2N 1N4
    J Appl Physiol (1985) 105:457-62. 2008
  2. doi request reprint Vertebral artery strains during high-speed, low amplitude cervical spinal manipulation
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, Canada
    J Electromyogr Kinesiol 22:740-6. 2012
  3. ncbi request reprint The three filament model of skeletal muscle stability and force production
    Walter Herzog
    University of Calgary, 2500 University Drive NW, KNB 402, Calgary, AB T2N 1N4
    Mol Cell Biomech 9:175-91. 2012
  4. pmc Simulating the swelling and deformation behaviour in soft tissues using a convective thermal analogy
    John Z Wu
    National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
    Biomed Eng Online 1:8. 2002
  5. doi request reprint The biomechanics of spinal manipulation
    Walter Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada
    J Bodyw Mov Ther 14:280-6. 2010
  6. doi request reprint Preliminary report: biomechanics of vertebral artery segments C1-C6 during cervical spinal manipulation
    Sarah Wuest
    Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada
    J Manipulative Physiol Ther 33:273-8. 2010
  7. ncbi request reprint The effective forces transmitted by high-speed, low-amplitude thoracic manipulation
    W Herzog
    Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada
    Spine (Phila Pa 1976) 26:2105-10; discussion 2110-1. 2001
  8. ncbi request reprint Considerations on joint and articular cartilage mechanics
    W Herzog
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, 2500 University Drive NW Calgary, Alberta, Canada, T2N 1N4
    Biomech Model Mechanobiol 5:64-81. 2006
  9. ncbi request reprint History dependence of skeletal muscle force production: implications for movement control
    Walter Herzog
    Faculties of Kinesiology, Engineering and Medicine, University of Calgary, 2500 University Drive N W, Calgary, AB, Canada T2N 1N4
    Hum Mov Sci 23:591-604. 2004
  10. ncbi request reprint Force enhancement at different levels of voluntary contraction in human adductor pollicis
    Ali E Oskouei
    Human Performance Laboratory, University of Calgary, Calgary, Alta, Canada, T2N 1N4
    Eur J Appl Physiol 97:280-7. 2006

Collaborators

Detail Information

Publications145 found, 100 shown here

  1. doi request reprint Residual force enhancement exceeds the isometric force at optimal sarcomere length for optimized stretch conditions
    Eun Jeong Lee
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 Univ Dr NW, Calgary, AB, Canada T2N 1N4
    J Appl Physiol (1985) 105:457-62. 2008
    ....
  2. doi request reprint Vertebral artery strains during high-speed, low amplitude cervical spinal manipulation
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, Canada
    J Electromyogr Kinesiol 22:740-6. 2012
    ..We conclude from this work that cervical SMT performed by trained clinicians does not appear to place undue strain on VA, and thus does not seem to be a factor in vertebro-basilar injuries...
  3. ncbi request reprint The three filament model of skeletal muscle stability and force production
    Walter Herzog
    University of Calgary, 2500 University Drive NW, KNB 402, Calgary, AB T2N 1N4
    Mol Cell Biomech 9:175-91. 2012
    ..Therefore, we propose that skeletal muscle force regulation is based on a three filament model that includes titin, rather than a two filament model consisting only of actin and myosin filaments...
  4. pmc Simulating the swelling and deformation behaviour in soft tissues using a convective thermal analogy
    John Z Wu
    National Institute for Occupational Safety and Health, Morgantown, West Virginia, USA
    Biomed Eng Online 1:8. 2002
    ..It is well accepted that the swelling of soft tissues is associated with mechanical, chemical, and electrical events...
  5. doi request reprint The biomechanics of spinal manipulation
    Walter Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, AB T2N 1N4, Canada
    J Bodyw Mov Ther 14:280-6. 2010
    ..Stresses and strains on the vertebral artery during chiropractic spinal manipulation of the neck were always much smaller than those produced during passive range of motion testing and diagnostic procedures...
  6. doi request reprint Preliminary report: biomechanics of vertebral artery segments C1-C6 during cervical spinal manipulation
    Sarah Wuest
    Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada
    J Manipulative Physiol Ther 33:273-8. 2010
    ....
  7. ncbi request reprint The effective forces transmitted by high-speed, low-amplitude thoracic manipulation
    W Herzog
    Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada
    Spine (Phila Pa 1976) 26:2105-10; discussion 2110-1. 2001
    ..All treatments were given by a full-time practicing clinician with 3 years of experience...
  8. ncbi request reprint Considerations on joint and articular cartilage mechanics
    W Herzog
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, 2500 University Drive NW Calgary, Alberta, Canada, T2N 1N4
    Biomech Model Mechanobiol 5:64-81. 2006
    ....
  9. ncbi request reprint History dependence of skeletal muscle force production: implications for movement control
    Walter Herzog
    Faculties of Kinesiology, Engineering and Medicine, University of Calgary, 2500 University Drive N W, Calgary, AB, Canada T2N 1N4
    Hum Mov Sci 23:591-604. 2004
    ..These results lead to the conclusion that history-dependent force production should be considered in models of movement control and voluntary force production...
  10. ncbi request reprint Force enhancement at different levels of voluntary contraction in human adductor pollicis
    Ali E Oskouei
    Human Performance Laboratory, University of Calgary, Calgary, Alta, Canada, T2N 1N4
    Eur J Appl Physiol 97:280-7. 2006
    ..The mechanisms responsible for this increased FE remain unclear...
  11. pmc Residual force enhancement in skeletal muscle
    W Herzog
    University of Calgary, 2500 University Dr N W, Calgary, AB, Canada T2N 1N4
    J Physiol 574:635-42. 2006
    ....
  12. ncbi request reprint Force enhancement following stretching of skeletal muscle: a new mechanism
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4
    J Exp Biol 205:1275-83. 2002
    ..Furthermore, the results indicate that mechanisms other than sarcomere length non-uniformity alone are operative...
  13. ncbi request reprint Residual force depression is not abolished following a quick shortening step
    W Herzog
    University of Calgary, 2500 University Dr N W Calgary, Canada
    J Biomech 40:2806-10. 2007
    ..We conclude from these results that a small amount of force depression persists following stress release caused by quick shortening, and therefore that the cross-bridge inhibition theory cannot be the sole cause of force depression...
  14. ncbi request reprint The role of muscles in joint adaptation and degeneration
    W Herzog
    University of Calgary, 2500 University Drive N W, Calgary, Alberta, T2N 1N4, Canada
    Langenbecks Arch Surg 388:305-15. 2003
    ..We attempt to emphasize the close dependence of muscle forces, joint loading and degeneration and, vice versa, try to point out how joint degeneration affects muscle forces and joint loading...
  15. ncbi request reprint Characterization of the passive component of force enhancement following active stretching of skeletal muscle
    W Herzog
    University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
    J Exp Biol 206:3635-43. 2003
    ..Based on these results, the molecular spring titin emerges as a possible candidate for the passive component of the steady-state force enhancement observed in this and previous studies...
  16. ncbi request reprint Considerations on muscle contraction
    W Herzog
    Faculty of Kinesiology, University of Calgary, 2500 University Dr N W, AB, Canada
    J Electromyogr Kinesiol 12:425-33. 2002
    ..We briefly consider the conceptual idea of myosin II working as a ratchet rather than a power stroke model, an idea that is explored in detail in the companion paper...
  17. ncbi request reprint Resultant and local loading in models of joint disease
    W Herzog
    The University of Calgary, Faculty of Kinesiology, Alberta, Canada
    Arthritis Rheum 49:239-47. 2003
  18. doi request reprint The force-length relationship of mechanically isolated sarcomeres
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
    Adv Exp Med Biol 682:141-61. 2010
    ..These results have direct implications for our understanding of the molecular mechanisms of muscle contraction...
  19. ncbi request reprint The relationship between force depression following shortening and mechanical work in skeletal muscle
    W Herzog
    Human Performance Laboratory, The University of Calgary, Faculty of Kinesiology, 2500 University Drive, N W, Calgary, Canada
    J Biomech 33:659-68. 2000
    ..Journal of Bimechanics 30 (9), 865-872; Maréchal and Plaghki, 1979...
  20. ncbi request reprint Muscle inhibition following knee injury and disease
    W Herzog
    Faculty of Kinesiology, University of Calgary
    Sportverletz Sportschaden 11:74-8. 1997
    ..Aggressive physiotherapy can eliminate strength deficits following knee injury through an increased ability to recruit the knee extensors in patients more completely compared to normal subjects...
  21. ncbi request reprint EMG-force relation in dynamically contracting cat plantaris muscle
    W Herzog
    Faculty of Kinesiology, University of Calgary, Alberta, Canada
    J Electromyogr Kinesiol 8:147-55. 1998
    ....
  22. ncbi request reprint History dependence of force production in skeletal muscle: a proposal for mechanisms
    W Herzog
    Faculty of Kinesiology, University of Calgary, Alberta, Canada
    J Electromyogr Kinesiol 8:111-7. 1998
    ..It is hoped that the considerations made here might stimulate a renewed interest in an old but unresolved topic in muscle mechanics...
  23. ncbi request reprint Force enhancement following stretch of activated muscle: critical review and proposal for mechanisms
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, Canada
    Med Biol Eng Comput 43:173-80. 2005
    ..The review is completed by the proposal of some questions and selected experiments that would test the proposed mechanisms in a rigorous way...
  24. ncbi request reprint The role of passive structures in force enhancement of skeletal muscles following active stretch
    W Herzog
    Human Performance Laboratory, University of Calgary, 2500 University Drive, NW, Calgary, Canada AB T2N 1N4
    J Biomech 38:409-15. 2005
    ..Therefore, the passive force-length relationship is not a constant property of skeletal muscle, but depends critically on the muscle's contractile history...
  25. ncbi request reprint Material and functional properties of articular cartilage and patellofemoral contact mechanics in an experimental model of osteoarthritis
    W Herzog
    Faculty of Kinesiology, The University of Calgary, Human Performance Laboratory, Alberta, Canada
    J Biomech 31:1137-45. 1998
    ..We conclude that the joint contact mechanics in the ACL-transected cat change within 16 weeks of experimental intervention...
  26. ncbi request reprint Force-sharing among the primary cat ankle muscles
    W Herzog
    University of Calgary, Faculty of Kinesiology, AB, Canada
    Eur J Morphol 36:280-7. 1998
    ....
  27. ncbi request reprint Muscle properties and coordination during voluntary movement
    W Herzog
    Faculty of Kinesiology, The University of Calgary, Alberta, Canada
    J Sports Sci 18:141-52. 2000
    ..Furthermore, the plasticity of skeletal muscle properties is illustrated using examples from high-performance sports. The review ends with a summary of the topics discussed and suggestions for future research...
  28. ncbi request reprint Force depression following skeletal muscle shortening is long lasting
    W Herzog
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, AB, Canada
    J Biomech 31:1163-8. 1998
    ..Although the present study was not designed to test this hypothesis, pilot results support the idea that force depression following shortening contractions might be explained exclusively by the muscular work during the shortening phase...
  29. ncbi request reprint The history dependence of force production in mammalian skeletal muscle following stretch-shortening and shortening-stretch cycles
    W Herzog
    Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada
    J Biomech 33:531-42. 2000
    ....
  30. ncbi request reprint Electromyographic responses of back and limb muscles associated with spinal manipulative therapy
    W Herzog
    Faculty of Kinesiology, University of Calgary, Alberta, Canada
    Spine (Phila Pa 1976) 24:146-52; discussion 153. 1999
    ..Ten young, asymptomatic male subjects underwent 11 clinically relevant spinal manipulative treatments along the length of the spine to test the magnitude and extent of reflex responses associated with the treatments...
  31. ncbi request reprint Effect of altering starting length and activation timing of muscle on fiber strain and muscle damage
    Timothy A Butterfield
    Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4
    J Appl Physiol 100:1489-98. 2006
    ....
  32. ncbi request reprint New insights into the passive force enhancement in skeletal muscles
    Eun Jeong Lee
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive N W, Calgary, Canada T2N 1N4
    J Biomech 40:719-27. 2007
    ....
  33. ncbi request reprint Increasing the moment arm of the tibialis anterior induces structural and functional adaptation: implications for tendon transfer
    T J Koh
    Faculty of Kinesiology, University of Calgary, Alberta, Canada
    J Biomech 31:593-9. 1998
    ..These findings have important implications for tendon transfer procedures that increase the moment arm and/or excursion of the released muscle...
  34. ncbi request reprint Is the force-length relationship a useful indicator of contractile element damage following eccentric exercise?
    Timothy A Butterfield
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alta Canada T2N 1N4
    J Biomech 38:1932-7. 2005
    ..We conclude from these results, that the shift in peak torque may not be a simple and reliable indicator of muscle damage, but is caused by a combination of damage and post-exercise fatigue...
  35. ncbi request reprint Proposed model of botulinum toxin-induced muscle weakness in the rabbit
    D Longino
    Faculty of Medicine, University of Calgary, Calgary, AB, Canada T2N 1N4
    J Orthop Res 23:1411-8. 2005
    ....
  36. ncbi request reprint An articular cartilage contact model based on real surface geometry
    S K Sang Kuy Han
    Department of Mechanical and Manufacturing Engineering, The University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
    J Biomech 38:179-84. 2005
    ..These results suggest that misalignment might be studied as one of the factors causing articular cartilage disorder and joint degeneration...
  37. pmc Modulation of passive force in single skeletal muscle fibres
    Dilson E Rassier
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary AB, Canada T2N 1N4
    Biol Lett 1:342-5. 2005
    ..Based on these results and recently published findings of the effects of Ca2+ on titin stiffness, we propose that the observed increase in passive force is caused by the molecular spring titin...
  38. ncbi request reprint Rabbit tendon cells produce MMP-3 in response to fluid flow without significant calcium transients
    Joanne M Archambault
    Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, 2500 University Drive, NW Calgary, Alberta, Canada T2N 1N4
    J Biomech 35:303-9. 2002
    ..The upregulation of the MMP-1, MMP-3 and COX-2 genes shows that fluid flow could be an important mechanical stimulus for tendon remodelling or injury...
  39. ncbi request reprint Coordination of medial gastrocnemius and soleus forces during cat locomotion
    Motoshi Kaya
    Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada, T2N 1N4
    J Exp Biol 206:3645-55. 2003
    ..In contrast, MG peak forces correlated well with EMG activities, suggesting that MG forces are primarily associated with activation while its contractile conditions play a minor role for the movement conditions tested here...
  40. ncbi request reprint Control of ground reaction forces by hindlimb muscles during cat locomotion
    Motoshi Kaya
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    J Biomech 39:2752-66. 2006
    ..We concluded from these results that MG and PL are primarily responsible for the control of the direction of the GRF, while SOL primarily functions as an anti-gravity muscle, and VL as an acceleration/deceleration muscle...
  41. ncbi request reprint Predictions of co-contraction depend critically on degrees-of-freedom in the musculoskeletal model
    Azim Jinha
    Human Performance Laboratory, The University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4
    J Biomech 39:1145-52. 2006
    ..They further emphasise the need for precise geometric representation of the musculoskeletal system, if general force-sharing rules are to be derived...
  42. doi request reprint Importance of collagen orientation and depth-dependent fixed charge densities of cartilage on mechanical behavior of chondrocytes
    Rami K Korhonen
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, AB, T2N 1N4, Canada
    J Biomech Eng 130:021003. 2008
    ....
  43. doi request reprint Changes in patellofemoral joint contact pressures caused by vastus medialis muscle weakness
    Andrew Sawatsky
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
    Clin Biomech (Bristol, Avon) 27:595-601. 2012
    ..The purpose of this study was to create an animal model of vastus medialis weakness and to test the effect of this weakness on patellofemoral contact pressures...
  44. doi request reprint Does residual force enhancement increase with increasing stretch magnitudes?
    Brandon Hisey
    Human Performance Lab, Faculty of Kinesiology, University of Calgary, 2500 University Drive N W Calgary, Alberta, Canada T2N 1N4
    J Biomech 42:1488-92. 2009
    ....
  45. ncbi request reprint Effects of shortening on stretch-induced force enhancement in single skeletal muscle fibers
    Dilson E Rassier
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive, N W Calgary AB, T2N 1N4, Canada
    J Biomech 37:1305-12. 2004
    ....
  46. ncbi request reprint Joint mechanics in osteoarthritis
    Walter Herzog
    Faculty of Kinesiology, Department of Mechanical Engineering, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
    Novartis Found Symp 260:79-95; discussion 95-9, 100-4, 277-9. 2004
    ..Based on our results, we speculate that unloading of the joint (rather than overloading), combined with poor muscular control and weakness, might constitute risks for the onset of joint degeneration...
  47. ncbi request reprint Muscular lower leg asymmetry in middle-aged people
    Victor Valderrabano
    Human Performance Laboratory and Orthopaedic Department, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N1N4, Canada
    Foot Ankle Int 28:242-9. 2007
    ..The purpose of this study was to determine whether muscular asymmetries were present in the lower legs of recreationally active middle-aged people grouped by leg dominance...
  48. ncbi request reprint Observations on force enhancement in submaximal voluntary contractions of human adductor pollicis muscle
    Ali E Oskouei
    University of Calgary, Calgary, Alberta, Canada T2N 1N4
    J Appl Physiol 98:2087-95. 2005
    ..On the basis of follow-up testing, it appears that force enhancement during voluntary contractions is linked to potentiation and fatigue resistance and therefore possibly to the fiber-type distribution in the adductor pollicis muscle...
  49. ncbi request reprint Force recovery after activated shortening in whole skeletal muscle: transient and steady-state aspects of force depression
    David T Corr
    Human Performance Laboratory, Univ of Calgary, Calgary, AB, Canada
    J Appl Physiol (1985) 99:252-60. 2005
    ....
  50. ncbi request reprint Force enhancement in single skeletal muscle fibres on the ascending limb of the force-length relationship
    Daniel R Peterson
    University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4
    J Exp Biol 207:2787-91. 2004
    ....
  51. ncbi request reprint In situ chondrocyte deformation with physiological compression of the feline patellofemoral joint
    A L Clark
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    J Biomech 36:553-68. 2003
    ....
  52. doi request reprint The effects of electrical stimulation exercise on muscles injected with botulinum toxin type-A (botox)
    Rafael Fortuna
    Human Performance Laboratory, University of Calgary, Calgary, Alberta, Canada, T2N 1N4
    J Biomech 46:36-42. 2013
    ..We conclude that ES exercise provides some protection from degeneration to target and non-target muscles during BTX-A treatments...
  53. doi request reprint In situ chondrocyte viscoelasticity
    Sang Kuy Han
    Human Performance Laboratory, University of Calgary, Canada
    J Biomech 45:2450-6. 2012
    ....
  54. ncbi request reprint Estimation of cat medial gastrocnemius fascicle lengths during dynamic contractions
    Motoshi Kaya
    Faculty of Kinesiology, Human Performance Laboratory, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada
    J Biomech 35:893-902. 2002
    ....
  55. doi request reprint The influence of cyclic concentric and eccentric submaximal muscle loading on cell viability in the rabbit knee joint
    Monika Horisberger
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada
    Clin Biomech (Bristol, Avon) 27:292-8. 2012
    ..We hypothesised that eccentric muscle activation leads to increased cell death rates compared to concentric loading and to controls...
  56. ncbi request reprint Active force inhibition and stretch-induced force enhancement in frog muscle treated with BDM
    Dilson E Rassier
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Dr, Calgary, AB, Canada T2N 1N4
    J Appl Physiol 97:1395-400. 2004
    ....
  57. ncbi request reprint The magnitude of muscle strain does not influence serial sarcomere number adaptations following eccentric exercise
    Timothy A Butterfield
    Faculty of Kinesiology, University of Calgary, T2 N 1N4, Calgary, AB, Canada
    Pflugers Arch 451:688-700. 2006
    ....
  58. pmc Force enhancement and relaxation rates after stretch of activated muscle fibres
    Dilson E Rassier
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive, Calgary, AB, Canada T2N 1N4
    Proc Biol Sci 272:475-80. 2005
    ..Together, these results support the idea that force enhancement is caused, at least in part, by a decrease in cross-bridge detachment rates, as manifested by the increased relaxation times following fibre stretch...
  59. ncbi request reprint Multi-functionality of the cat medical gastrocnemius during locomotion
    Motoshi Kaya
    Human Performance Laboratory, University of Calgary, Faculty of Kinesiology, 2500 University Drive NW, Calgary, Alberta, T2N 1N4, Canada
    J Biomech 38:1291-301. 2005
    ..We conclude that cat MG has multiple functional roles during the stance phase of locomotion, and speculate that such multi-functionality also exists in other bi- and multi-articular muscles...
  60. ncbi request reprint The role of muscles in joint degeneration and osteoarthritis
    Walter Herzog
    Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, 2500 University Drive NW, Calgary, Alta, Canada T2N 1N4
    J Biomech 40:S54-63. 2007
    ....
  61. ncbi request reprint Acute botulinum toxin-induced muscle weakness in the anterior cruciate ligament-deficient rabbit
    David Longino
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4
    J Orthop Res 23:1404-10. 2005
    ..Hopefully, BTX-A injection for acutely enhancing the degree of muscle weakness in otherwise untreated animals, or in experimental models of osteoarthritis, will help in investigating the role of muscle weakness in joint degeneration...
  62. ncbi request reprint Stretch-induced, steady-state force enhancement in single skeletal muscle fibers exceeds the isometric force at optimum fiber length
    Dilson E Rassier
    Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, 2500, University Dr N W Calgary, AB T2N 1N4, Calgary, Canada
    J Biomech 36:1309-16. 2003
    ....
  63. ncbi request reprint Mysteries of muscle contraction
    Walter Herzog
    Faculty of Kinesiology, University of Calgary, AB
    J Appl Biomech 24:1-13. 2008
    ..The active component is associated with the cross-bridge kinetics, and the passive component is associated with a calcium-dependent increase in titin stiffness...
  64. doi request reprint Shortening-induced force depression is primarily caused by cross-bridges in strongly bound states
    Eun Jeong Lee
    Faculty of Kinesiology, University of Calgary 2500 University Drive N W, Calgary AB T2N 1N4, Canada
    J Biomech 42:2336-40. 2009
    ....
  65. ncbi request reprint Internal forces sustained by the vertebral artery during spinal manipulative therapy
    Bruce P Symons
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Canada
    J Manipulative Physiol Ther 25:504-10. 2002
    ..One major issue with the use of SMT is its safety, especially with respect to neck manipulation and the risk of stroke in the vertebrobasilar system...
  66. ncbi request reprint History-dependence of isometric muscle force: effect of prior stretch or shortening amplitude
    Sharon R Bullimore
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada T2N 1N4
    J Biomech 40:1518-24. 2007
    ..This finding has important consequences for determining the mechanisms underlying FE and passive FE because any mechanism that is proposed to explain them must be able to predict it...
  67. pmc Premature deactivation of soleus during the propulsive phase of cat jumping
    Motoshi Kaya
    Faculty of Kinesiology, Human Performance Laboratory, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    J R Soc Interface 5:415-26. 2008
    ....
  68. pmc Mechanical loading of in situ chondrocytes in lapine retropatellar cartilage after anterior cruciate ligament transection
    Sang Kuy Han
    Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, University of Calgary, Alberta, Canada
    J R Soc Interface 7:895-903. 2010
    ..Surprisingly, chondrocyte deformations increased in early OA in specific transverse directions which have received little attention to date but might be crucial to chondrocyte signalling in early OA...
  69. ncbi request reprint Heterogeneity in patellofemoral cartilage adaptation to anterior cruciate ligament transection; chondrocyte shape and deformation with compression
    A L Clark
    The Human Performance Laboratory, Faculties of Kinesiology and Medicine, The University of Calgary, Alberta, Canada
    Osteoarthritis Cartilage 14:120-30. 2006
    ..In situ static compression of physiological magnitude was applied to the feline patellofemoral cartilage 16 weeks post-ACL-T and cartilage and chondrocyte deformation were evaluated by histomorphometry...
  70. doi request reprint Regulation of muscle force in the absence of actin-myosin-based cross-bridge interaction
    T R Leonard
    Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
    Am J Physiol Cell Physiol 299:C14-20. 2010
    ....
  71. ncbi request reprint The origin of passive force enhancement in skeletal muscle
    V Joumaa
    Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
    Am J Physiol Cell Physiol 294:C74-8. 2008
    ..The findings of the present study suggest that passive force enhancement is partly caused by a calcium-induced increase in titin stiffness but also requires cross-bridge formation and/or active force production for full manifestation...
  72. ncbi request reprint The dependence of force enhancement on activation in human adductor pollicis
    Ali E Oskouei
    Human Performance Laboratory, University of Calgary, Calgary, Alta, Canada
    Eur J Appl Physiol 98:22-9. 2006
    ..We conclude from these results that force enhancement during voluntary contractions is activation-dependent with a threshold that is subject-specific...
  73. ncbi request reprint Relationship between force and stiffness in muscle fibers after stretch
    Dilson E Rassier
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 Univ Dr, Calgary, AB, Canada T2N 1N4
    J Appl Physiol (1985) 99:1769-75. 2005
    ..Because BDM places cross bridges in a weakly bound, pre-powerstroke state, our results further suggest that force enhancement is partially associated with a recruitment of weakly bound cross bridges into a strongly bound state...
  74. ncbi request reprint Differential serial sarcomere number adaptations in knee extensor muscles of rats is contraction type dependent
    Timothy A Butterfield
    Faculty of Kinesiology, University of Calgary, Alberta, Canada
    J Appl Physiol 99:1352-8. 2005
    ..Short muscle lengths for uphill concentric-biased contractions result in a loss of serial sarcomeres, and long muscle lengths for downhill eccentric-biased contractions result in a gain of serial sarcomeres...
  75. pmc Force depression following muscle shortening of voluntarily activated and electrically stimulated human adductor pollicis
    Hae Dong Lee
    Faculty of Kinesiology, University of Calgary, 2500 University Drive, NW, Calgary, Alberta, T2N 1N4, Canada
    J Physiol 551:993-1003. 2003
    ..Furthermore, it appears that force depression is established at the end of the shortening phase and is associated with a reduction in muscle stiffness and thus, presumably, a decrease in the proportion of attached cross-bridges...
  76. ncbi request reprint Eccentric training does not increase sarcomere number in rabbit dorsiflexor muscles
    T J Koh
    Faculty of Kinesiology, University of Calgary, AB, Canada
    J Biomech 31:499-501. 1998
    ..Thus eccentric training had little or no effect on sarcomere number. These results do not support previous speculation that eccentric training produces increases in sarcomere number...
  77. ncbi request reprint A framework for structured modeling of skeletal muscle
    R R Lemos
    Department of Computer Science, The University of Calgary, Calgary, Alta, Canada
    Comput Methods Biomech Biomed Engin 7:305-17. 2004
    ....
  78. ncbi request reprint Force enhancement above the initial isometric force on the descending limb of the force-length relationship
    R Schachar
    Faculty of Kinesiology Human Performance Laboratory, University of Calgary, 2500 University Drive NW, Calgary, Canada
    J Biomech 35:1299-306. 2002
    ....
  79. doi request reprint A task-specific validation of homogeneous non-linear optimisation approaches
    A Jinha
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, Calgary, AB, Canada T2N 1N4
    J Theor Biol 259:695-700. 2009
    ....
  80. ncbi request reprint Fluid pressure driven fibril reinforcement in creep and relaxation tests of articular cartilage
    L P Li
    Roger Jackson Centre for Health and Wellness Research, Faculty of Kinesiology, University of Calgary, 2500 University Drive, N W Calgary, Alberta, Canada T2N 1N4
    Med Eng Phys 30:182-9. 2008
    ..Fibril reinforcement played a relatively insignificant role in the compressive load response at equilibrium, in agreement with previous findings for cartilage stress relaxation testing...
  81. pmc Residual force enhancement in myofibrils and sarcomeres
    V Joumaa
    University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    Proc Biol Sci 275:1411-9. 2008
    ....
  82. ncbi request reprint The mechanical behaviour of chondrocytes predicted with a micro-structural model of articular cartilage
    S K Han
    Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, The University of Calgary, Calgary, AB, Canada
    Biomech Model Mechanobiol 6:139-50. 2007
    ..The novelty of this study is the use of a cartilage material model accounting for the intrinsic inhomogeneity and anisotropy of cartilage caused by its microstructure...
  83. ncbi request reprint Opposing cartilages in the patellofemoral joint adapt differently to long-term cruciate deficiency: chondrocyte deformation and reorientation with compression
    A L Clark
    The Human Performance Laboratory, Faculties of Kinesiology and Medicine, The University of Calgary, Calgary, Canada
    Osteoarthritis Cartilage 13:1100-14. 2005
    ....
  84. ncbi request reprint Quantification of muscle fiber strain during in vivo repetitive stretch-shortening cycles
    Timothy A Butterfield
    Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4
    J Appl Physiol 99:593-602. 2005
    ..This is due, in part, to temporal effects of repeated loading on fiber strain magnitude that may be explained by an increasing compliance of the contractile element as exercise progresses...
  85. doi request reprint Force depression in single myofibrils
    V Joumaa
    Human Performance Laboratory, University of Calgary, Alberta, Canada
    J Appl Physiol (1985) 108:356-62. 2010
    ..Rather, force depression seems an intrinsic property of individual (half-) sarcomeres and muscle contraction...
  86. ncbi request reprint Antagonistic activity of one-joint muscles in three-dimensions using non-linear optimisation
    A Jinha
    Human Performance Laboratory, The University of Calgary, Calgary, AB, Canada T2N 1N4
    Math Biosci 202:57-70. 2006
    ..Furthermore, we provide, for a given three-dimensional system consisting of single joint muscles, a method that describes all the possible joint moments that give co-contraction for a given pair of antagonistic muscles...
  87. ncbi request reprint Contact area and pressure distribution in the feline patellofemoral joint under physiologically meaningful loading conditions
    A L Clark
    The University of Calgary, Faculty of Kinesiology, Human Performance Laboratory, 2500, University Drive NW, AB, T2N 1N4, Calgary, Canada
    J Biomech 35:53-60. 2002
    ..It likely represents a natural protection of joints to high external load magnitudes...
  88. ncbi request reprint The effects of muscle stretching and shortening on isometric forces on the descending limb of the force-length relationship
    R Schachar
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Dr NW, Calgary, AB, Canada T2N 1N4
    J Biomech 37:917-26. 2004
    ..that force enhancement and force depression are critically affected by muscle length and stretch/shortening amplitude...
  89. ncbi request reprint Passive force enhancement in single myofibrils
    V Joumaa
    Human Performance Laboratory, University of Calgary, Calgary, Canada
    Pflugers Arch 455:367-71. 2007
    ..We propose that this might occur through an increase in stiffness when calcium concentration increases upon activation...
  90. pmc Excursion is important in regulating sarcomere number in the growing rabbit tibialis anterior
    T J Koh
    Faculty of Kinesiology, University of Calgary, Calgary, AB, Canada T2N 4N1
    J Physiol 508:267-80. 1998
    ....
  91. ncbi request reprint Arthroscopic evaluation of cartilage degeneration using indentation testing--influence of indenter geometry
    L P Li
    Faculty of Kinesiology, University of Calgary, Alta, Canada
    Clin Biomech (Bristol, Avon) 21:420-6. 2006
    ..Therefore, it is important to consider the collagen network as a distinct constituent in the study of arthroscopic evaluation of cartilage degeneration...
  92. doi request reprint Muscle weakness causes joint degeneration in rabbits
    A Rehan Youssef
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, AB, Canada
    Osteoarthritis Cartilage 17:1228-35. 2009
    ..The objective of this study was to investigate the effects of botulinum toxin type-A (BTX-A) induced quadriceps weakness on micro-structural changes in knee cartilage of New Zealand White (NZW) rabbits...
  93. doi request reprint Is a parallel elastic element responsible for the enhancement of steady-state muscle force following active stretch?
    S R Bullimore
    Human Performance Lab, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    J Exp Biol 211:3001-8. 2008
    ..0004 and P=0.03, respectively). Therefore, our hypothesis was not supported. We conclude that rFE is unlikely to be generated solely by a parallel elastic element...
  94. ncbi request reprint Does the speed of shortening affect steady-state force depression in cat soleus muscle?
    T R Leonard
    Human Performance Laboratory, University of Calgary, 2500 University Drive N W, Calgary, Canada AB T2N 1N4
    J Biomech 38:2190-7. 2005
    ..These results support, but do not prove, the current hypothesis that force depression is caused by a stress-related cross-bridge inhibition in the actin-myosin overlap zone that is newly formed during muscle shortening...
  95. ncbi request reprint Should tendon and aponeurosis be considered in series?
    Marcelo Epstein
    Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alta, Canada T2N 1N4
    J Biomech 39:2020-5. 2006
    ..Unfortunately, this requirement eliminates, for all but the simplest cases, a theoretical approach of muscle modeling based on intuitive free-body diagrams...
  96. ncbi request reprint On the anisotropy and inhomogeneity of permeability in articular cartilage
    Salvatore Federico
    Human Performance Laboratory, Faculty of Kinesiology, The University of Calgary, 2500 University Drive NW, Calgary, AB, Canada, T2N 1N4
    Biomech Model Mechanobiol 7:367-78. 2008
    ..Looking at the local anisotropy of permeability, we may infer that the arrangement of the collagen fibre network plays an important role in directing fluid flow to optimise tissue functioning...
  97. doi request reprint Towards an analytical model of soft biological tissues
    Salvatore Federico
    Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, The University of Calgary, Calgary, Alberta, Canada
    J Biomech 41:3309-13. 2008
    ..The present model is a first attempt in the development of a unified analytical microstructural model for non-linear elasticity and permeability of hydrated, fibre-reinforced soft tissues...
  98. ncbi request reprint Vibration training: an overview of the area, training consequences, and future considerations
    Matthew J Jordan
    Canadian Sport Centre Calgary, University of Calgary, Calgary, Alberta T2N 1N4, Canada
    J Strength Cond Res 19:459-66. 2005
    ..Future research should be done with the aim of understanding the biological effects of vibration on muscle performance and also the effects of different vibration protocols on muscle performance...
  99. ncbi request reprint Determining patterns of motor recruitment during locomotion
    James M Wakeling
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada T2N 1N4
    J Exp Biol 205:359-69. 2002
    ..Myoelectric signals are resolved into time/frequency space using wavelets to demonstrate how patterns of motor unit recruitment can be determined for a range of locomotor activities...
  100. doi request reprint Confocal microscopy indentation system for studying in situ chondrocyte mechanics
    Sang Kuy Han
    Department of Mechanical Engineering, Schulich School of Engineering, University of Calgary, Alberta, Canada
    Med Eng Phys 31:1038-42. 2009
    ..It can also provide novel information on the relationship between cell loading and cartilage adaptive/degenerative processes in the intact tissue...
  101. ncbi request reprint Depth-dependent analysis of the role of collagen fibrils, fixed charges and fluid in the pericellular matrix of articular cartilage on chondrocyte mechanics
    Rami K Korhonen
    Human Performance Laboratory, Faculty of Kinesiology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
    J Biomech 41:480-5. 2008
    ....