RICHARD NEPTUNE

Summary

Affiliation: University of Texas
Country: USA

Publications

  1. ncbi request reprint Muscle activation and deactivation dynamics: the governing properties in fast cyclical human movement performance?
    R R Neptune
    Rehabilitation R and D Center 153, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
    Exerc Sport Sci Rev 29:76-80. 2001
  2. pmc Forward dynamics simulations provide insight into muscle mechanical work during human locomotion
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 78712, USA
    Exerc Sport Sci Rev 37:203-10. 2009
  3. doi request reprint The influence of muscle physiology and advanced technology on sports performance
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas, Austin, Texas 78712, USA
    Annu Rev Biomed Eng 11:81-107. 2009
  4. pmc Modular control of human walking: a simulation study
    Richard R Neptune
    Department of Mechanical Engineering, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    J Biomech 42:1282-7. 2009
  5. pmc The effect of walking speed on muscle function and mechanical energetics
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas, 1 University Station C2200, Austin, TX, USA
    Gait Posture 28:135-43. 2008
  6. pmc Muscle contributions to whole-body sagittal plane angular momentum during walking
    R R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712 0292, USA
    J Biomech 44:6-12. 2011
  7. ncbi request reprint An experimental and theoretical framework for manufacturing prosthetic sockets for transtibial amputees
    Mario C Faustini
    Department of Mechanical Engineering, The University of Texas, Austin, TX 78712 0292, USA
    IEEE Trans Neural Syst Rehabil Eng 14:304-10. 2006
  8. ncbi request reprint The neuromuscular demands of toe walking: a forward dynamics simulation analysis
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    J Biomech 40:1293-300. 2007
  9. ncbi request reprint Contributions of the individual ankle plantar flexors to support, forward progression and swing initiation during walking
    R R Neptune
    Rehabilitation R and D Center 153, VA Palo Alto Health Care System, 3801 Miranda Avenue, Palo Alto, CA 94304, USA
    J Biomech 34:1387-98. 2001
  10. ncbi request reprint Muscle force redistributes segmental power for body progression during walking
    R R Neptune
    Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712 1063, USA
    Gait Posture 19:194-205. 2004

Collaborators

Detail Information

Publications36

  1. ncbi request reprint Muscle activation and deactivation dynamics: the governing properties in fast cyclical human movement performance?
    R R Neptune
    Rehabilitation R and D Center 153, Veterans Affairs Palo Alto Health Care System, Palo Alto, California, USA
    Exerc Sport Sci Rev 29:76-80. 2001
    ..Pedaling and animal studies provide supporting data...
  2. pmc Forward dynamics simulations provide insight into muscle mechanical work during human locomotion
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 78712, USA
    Exerc Sport Sci Rev 37:203-10. 2009
    ....
  3. doi request reprint The influence of muscle physiology and advanced technology on sports performance
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas, Austin, Texas 78712, USA
    Annu Rev Biomed Eng 11:81-107. 2009
    ..This review discusses the influence of intrinsic muscle properties in sports and how advanced technology can be used to extend the limits of human performance...
  4. pmc Modular control of human walking: a simulation study
    Richard R Neptune
    Department of Mechanical Engineering, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    J Biomech 42:1282-7. 2009
    ..These results provide evidence that the identified modules can act as basic neural control elements that generate task-specific biomechanical functions to produce well-coordinated walking...
  5. pmc The effect of walking speed on muscle function and mechanical energetics
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas, 1 University Station C2200, Austin, TX, USA
    Gait Posture 28:135-43. 2008
    ....
  6. pmc Muscle contributions to whole-body sagittal plane angular momentum during walking
    R R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712 0292, USA
    J Biomech 44:6-12. 2011
    ..These results may provide insight into balance and movement disorders and provide a basis for developing locomotor therapies that target specific muscle groups...
  7. ncbi request reprint An experimental and theoretical framework for manufacturing prosthetic sockets for transtibial amputees
    Mario C Faustini
    Department of Mechanical Engineering, The University of Texas, Austin, TX 78712 0292, USA
    IEEE Trans Neural Syst Rehabil Eng 14:304-10. 2006
    ..In the case study performed, the FEM results were within 3% of the experimental failure loads for the socket and were considered satisfactory...
  8. ncbi request reprint The neuromuscular demands of toe walking: a forward dynamics simulation analysis
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    J Biomech 40:1293-300. 2007
    ..Therefore, medical decisions concerning whether to reduce equinus should consider not only the impact on the ankle moment, but also the expected change to the plantar flexor's force generating capacity...
  9. ncbi request reprint Contributions of the individual ankle plantar flexors to support, forward progression and swing initiation during walking
    R R Neptune
    Rehabilitation R and D Center 153, VA Palo Alto Health Care System, 3801 Miranda Avenue, Palo Alto, CA 94304, USA
    J Biomech 34:1387-98. 2001
    ....
  10. ncbi request reprint Muscle force redistributes segmental power for body progression during walking
    R R Neptune
    Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712 1063, USA
    Gait Posture 19:194-205. 2004
    ....
  11. ncbi request reprint Ankle plantar flexor force production is an important determinant of the preferred walk-to-run transition speed
    Richard R Neptune
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    J Exp Biol 208:799-808. 2005
    ....
  12. ncbi request reprint Muscle mechanical work requirements during normal walking: the energetic cost of raising the body's center-of-mass is significant
    R R Neptune
    Department of Mechanical Engineering, University of Texas at Austin, TX 78712, USA
    J Biomech 37:817-25. 2004
    ....
  13. ncbi request reprint The quasi-static response of compliant prosthetic sockets for transtibial amputees using finite element methods
    Mario C Faustini
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    Med Eng Phys 28:114-21. 2006
    ..These results suggest that the integration of local compliant features is an effective method to reduce local contact pressure and improve the functional performance of prosthetic sockets...
  14. ncbi request reprint Muscle mechanical work and elastic energy utilization during walking and running near the preferred gait transition speed
    Kotaro Sasaki
    Department of Mechanical Engineering, The University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    Gait Posture 23:383-90. 2006
    ..These results support previous suggestions that muscle mechanical energy expenditure is an important determinant for the preferred gait mode at a given speed...
  15. pmc Pre-swing deficits in forward propulsion, swing initiation and power generation by individual muscles during hemiparetic walking
    Carrie L Peterson
    Department of Mechanical Engineering, The University of Texas at Austin, TX, USA
    J Biomech 43:2348-55. 2010
    ..Rehabilitation strategies aimed at diminishing these deficits have much potential to improve walking function in these hemiparetic subjects and those with similar deficits...
  16. ncbi request reprint Muscle compensatory mechanisms during able-bodied toe walking
    Kotaro Sasaki
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    Gait Posture 27:440-6. 2008
    ....
  17. ncbi request reprint Mechanical energetic contributions from individual muscles and elastic prosthetic feet during symmetric unilateral transtibial amputee walking: a theoretical study
    Robert J Zmitrewicz
    Department of Mechanical Engineering, University of Texas at Austin, 1 University Station C2200, Austin, TX 78712, USA
    J Biomech 40:1824-31. 2007
    ....
  18. ncbi request reprint The effect of foot and ankle prosthetic components on braking and propulsive impulses during transtibial amputee gait
    Robert J Zmitrewicz
    Department of Mechanical Engineering, University of Texas, Austin, TX 78712, USA
    Arch Phys Med Rehabil 87:1334-9. 2006
    ..To assess the influence of energy storage and return (ESAR) prosthetic feet and multi-axis ankles on ground reaction forces and loading asymmetry between lower limbs in transtibial amputees...
  19. ncbi request reprint Differences in muscle function during walking and running at the same speed
    Kotaro Sasaki
    Department of Mechanical Engineering, University of Texas at Austin, Austin, TX 78712, USA
    J Biomech 39:2005-13. 2006
    ..All other muscle groups distributed mechanical power among the body segments and provided support and forward propulsion in a qualitatively similar manner in both walking and running...
  20. ncbi request reprint Design and analysis of orthogonally compliant features for local contact pressure relief in transtibial prostheses
    Mario C Faustini
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA
    J Biomech Eng 127:946-51. 2005
    ..These results indicate that the integration of compliant features within the socket structure is an effective way to reduce potentially harmful contact pressure and increase patient comfort...
  21. pmc Relationships between muscle activity and anteroposterior ground reaction forces in hemiparetic walking
    Lindsey J Turns
    Department of Mechanical Engineering, University of Texas, Austin, TX 78712, USA
    Arch Phys Med Rehabil 88:1127-35. 2007
    ..To determine relationships between muscle activity and propulsive impulse in hemiparetic walking...
  22. pmc A phenomenological model and validation of shortening-induced force depression during muscle contractions
    Craig P McGowan
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    J Biomech 43:449-54. 2010
    ..However, to fully understand the impact of this phenomenon on human movement, more research is needed to characterize the relationship between force depression and mechanical work in large muscles with different morphologies...
  23. pmc Modular control of human walking: Adaptations to altered mechanical demands
    Craig P McGowan
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    J Biomech 43:412-9. 2010
    ..These results support the idea that the nervous system may use a modular control strategy and that flexible modulation of module recruitment intensity may be sufficient to meet large changes in mechanical demand...
  24. ncbi request reprint Biomechanical determinants of pedaling energetics: internal and external work are not independent
    Steven A Kautz
    Rehabilitation Research and Development Center, Veterans Affairs Palo Alto Health Care System, CA, USA
    Exerc Sport Sci Rev 30:159-65. 2002
    ..The work done by the muscles to accelerate the leg segments ultimately drives the pedals because when the legs decelerate, their mechanical energy is used to overcome the external load...
  25. doi request reprint Compensatory mechanisms in below-knee amputee gait in response to increasing steady-state walking speeds
    Anne K Silverman
    Department of Mechanical Engineering, The University of Texas, 1 University Station, Austin, TX 78712, USA
    Gait Posture 28:602-9. 2008
    ..Thus, increasing residual leg hip extensor strength and output may be a useful mechanism to reduce GRF loading asymmetry between the intact and residual legs...
  26. ncbi request reprint Compensatory strategies during normal walking in response to muscle weakness and increased hip joint stiffness
    Evan J Goldberg
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    Gait Posture 25:360-7. 2007
    ..Thus, rehabilitation or preventative exercise programs may consider focusing on increasing or maintaining plantar flexor strength, which appears critical to maintaining normal walking mechanics...
  27. ncbi request reprint Advanced trans-tibial socket fabrication using selective laser sintering
    Bill Rogers
    Department of Rehabilitation Medicine, University of Texas Health Science Center at San Antonio, TX, USA
    Prosthet Orthot Int 31:88-100. 2007
    ..This paper details the development of SLS prosthetic socket fabrication techniques at UTHSCSA/UTA over a six-year period...
  28. doi request reprint Manufacture of Passive Dynamic ankle-foot orthoses using selective laser sintering
    Mario C Faustini
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712 0292, USA
    IEEE Trans Biomed Eng 55:784-90. 2008
    ..Mechanical damping evaluation ranked the materials as Rilsan D80 (best), followed by DuraForm PA and DuraForm GF. In addition, Rilsan D80 was the only SLS material able to withstand large deformations...
  29. ncbi request reprint Biomechanics and muscle coordination of human walking: part II: lessons from dynamical simulations and clinical implications
    Felix E Zajac
    Rehabilitation R and D Center 153, VA Palo Alto Health Care System and Department of Mechanical Engineering, Stanford University, CA, USA
    Gait Posture 17:1-17. 2003
    ..Finally, we discuss how biomechanical models and simulations may enhance our understanding of the mechanics and muscle function of walking in individuals with gait impairments...
  30. doi request reprint Manufacture of energy storage and return prosthetic feet using selective laser sintering
    Brian J South
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    J Biomech Eng 132:015001. 2010
    ..This validated the current framework as a means to fabricate SLS-based ESAR prosthetic feet. Future work will be directed at creating feet with a range of stiffness levels to investigate appropriate prescription criteria...
  31. ncbi request reprint Biomechanics and muscle coordination of human walking. Part I: introduction to concepts, power transfer, dynamics and simulations
    Felix E Zajac
    Rehabilitation R and D Center 153, VA Palo Alto Health Care System, Bldg 51, 3801 Miranda Avenue, Palo Alto, CA 94304 1200, USA
    Gait Posture 16:215-32. 2002
    ..Part II reviews how dynamical simulations provide insight into muscle coordination of walking...
  32. doi request reprint A theoretical analysis of an optimal chainring shape to maximize crank power during isokinetic pedaling
    Jeffery W Rankin
    Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
    J Biomech 41:1494-502. 2008
    ....
  33. ncbi request reprint Relationship between step length asymmetry and walking performance in subjects with chronic hemiparesis
    Chitralakshmi K Balasubramanian
    Department of Physical Therapy, University of Florida, Gainesville, FL, USA
    Arch Phys Med Rehabil 88:43-9. 2007
    ..To understand the relationship between step length asymmetry and hemiparetic walking performance...
  34. ncbi request reprint Coordination of hemiparetic locomotion after stroke rehabilitation
    Steven A Kautz
    Brain Rehabilitation Research Center, Malcom Randall VA Medical Center, Gainesville FL, 32608, USA
    Neurorehabil Neural Repair 19:250-8. 2005
    ..Determine whether a rehabilitation program targeting functional motor recovery of persons with poststroke hemiparesis improved motor coordination...
  35. ncbi request reprint Anterior-posterior ground reaction forces as a measure of paretic leg contribution in hemiparetic walking
    Mark G Bowden
    Brain Rehabilitation Research Center, Malcom Randall VA Medical Center, Gainesville, FL 32608, USA
    Stroke 37:872-6. 2006
    ....
  36. pmc Can treadmill walking be used to assess propulsion generation?
    Evan J Goldberg
    Department of Orthopaedic Surgery, University of California at Los Angeles, Los Angeles, CA, USA
    J Biomech 41:1805-8. 2008
    ..We conclude that treadmill walking can be used to investigate propulsion generation in healthy and by implication clinical populations...