Research Topics
| S M McGillSummaryAffiliation: University of Waterloo Country: Canada Publications
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Detail Information
Publications
Evidence of a double peak in muscle activation to enhance strike speed and force: an example with elite mixed martial arts fightersStuart M McGill
Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
J Strength Cond Res 24:348-57. 2010....- Sitting on a chair or an exercise ball: various perspectives to guide decision makingS M McGill
Clinical Biomechanics, Department of Kinesiology, University of Waterloo, Ont, Canada
Clin Biomech (Bristol, Avon) 21:353-60. 2006..Also, differences in the pressure distribution at the seat-user interface were quantified for the different seat surfaces to provide an objective perspective on the mechanism influencing perceived comfort levels... - Transfer of the horizontal patient: the effect of a friction reducing assistive device on low back mechanicsS M McGill
Department of Kinesiology, University of Waterloo, Ontario, Canada
Ergonomics 48:915-29. 2005..The direction of hand forces and torso position remains important... - Muscle activity and low back loads under external shear and compressive loadingJ P Callaghan
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 20:992-8. 1995..Biomechanical models that use the objective criterion of minimum joint load may not be representative of the motor control system, at least in the low back... - Spinal manipulation causes variable spine kinematic and trunk muscle electromyographic responsesG J Lehman
Faculty of Applied Health Sciences, UW Canadian Memorial Chiropractic College Research Clinic, University of Waterloo, Ont, Canada
Clin Biomech (Bristol, Avon) 16:293-9. 2001..Analytic cohort with a convenience sample in a research clinic... - Changes in lumbar lordosis modify the role of the extensor musclesS M McGill
Faculty of Applied Health Sciences, Department of Kinesiology, Occupational Biomechanics Laboratory, University of Waterloo, Waterloo, N2L 3G1, Ontario, Canada
Clin Biomech (Bristol, Avon) 15:777-80. 2000..Fiber angles of longissimus thoracis and iliocostalis lumborum at L3 were documented in vivo, using high resolution ultrasound, with the lumbar spine in neutral curve and when fully flexed... - Transfer of loads between lumbar tissues during the flexion-relaxation phenomenonS M McGill
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 19:2190-6. 1994..Loading of the interspinous and supraspinous ligaments, in particular, was high relative to their failure tolerance... - Lumbar erector spinae oxygenation during prolonged contractions: implications for prolonged workS M McGill
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Canada
Ergonomics 43:486-93. 2000.... - The influence of lordosis on axial trunk torque and trunk muscle myoelectric activityS M McGill
Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 17:1187-93. 1992..e., passive tissue) contribute significantly to axial torque production and that the flexed and twisted spine is less able to resist applied axial torques, possibly increasing the risk of torsional injury... - Three-dimensional kinematics and trunk muscle myoelectric activity in the elderly spine - a database compared to young peopleS M McGill
Occupational Biomechanics Laboratory, Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Waterloo, Ont, Canada
Clin Biomech (Bristol, Avon) 14:389-95. 1999..To establish a database of lumbar spine kinematics and muscle activation profiles for a healthy elderly population... - Assessment of an EMG-based method for continuous estimates of low back compression during asymmetrical occupational tasksM I Mientjes
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
Ergonomics 42:868-79. 1999..Estimates of spine compression at a specific probability, and estimates obtained during task combinations dominated by an axial twisting moment, are poor... - Trunk muscle and lumbar ligament contributions to dynamic lifts with varying degrees of trunk flexionJ R Potvin
Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 16:1099-107. 1991..The risk of injury may be influenced more by the degree of lumbar flexion than the choice of stoop or squat technique... - Distribution of tissue loads in the low back during a variety of daily and rehabilitation tasksS M McGill
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, ON, Canada
J Rehabil Res Dev 34:448-58. 1997..Specific data are provided to guide selection of various abdominal and low back exercises. Finally, some hypotheses and opinions are offered for possible improvements in clinical success... - Does methocarbamol affect fatigue markers in the low-back electromyogram?J Boakes
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
J Electromyogr Kinesiol 8:423-7. 1998.... - Anterior shear of spinal motion segments. Kinematics, kinetics, and resultant injuries observed in a porcine modelV R Yingling
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 24:1882-9. 1999..Fractures in the pars interarticularis may not greatly weaken the joint, given the dominant role of the disc, but compromise its normal kinematics. Clinically, this may explain the occurrence of pars fractures, without total disability... - Intervertebral disc herniation: studies on a porcine model exposed to highly repetitive flexion/extension motion with compressive forceJ P Callaghan
Occupational Biomechanics and Safety Laboratories, Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Ont, N2L 3G1, Waterloo, Canada
Clin Biomech (Bristol, Avon) 16:28-37. 2001..This study was designed to examine the biomechanical response and failure mechanics of spine motion segments to highly repetitive low magnitude complex loading... - Low back exercises: evidence for improving exercise regimensS M McGill
Department of Kinesiology, Faculty of Applied Health Sciences, University of Waterloo, Ontario, Canada
Phys Ther 78:754-65. 1998..These exercises form a basic program for rehabilitation and maintenance of low back health... - Kinetic potential of the lumbar trunk musculature about three orthogonal orthopaedic axes in extreme posturesS M McGill
Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 16:809-15. 1991..This observation supports the notion held by some therapists that conditioning of the erector spinae is of utmost importance... - Effects of a mechanical pain stimulus on erector spinae activity before and after a spinal manipulation in patients with back pain: a preliminary investigationG J Lehman
University of Waterloo Canadian Memorial Chiropractic College Research Clinic, Faculty of Applied Health Sciences, University of Waterloo, Toronto, Ontario, Canada
J Manipulative Physiol Ther 24:402-6. 2001.... - Spinal shrinkage during repetitive controlled torsional, flexion and lateral bend motion exertionsG Au
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Canada
Ergonomics 44:373-81. 2001..These data suggest that repetitive torsional motions impose a larger cumulative loading on the spine when compared with controlled lateral or flexion motion tasks of a similar moment... - Low back stability: from formal description to issues for performance and rehabilitationS M McGill
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Waterloo, Ontario, Canada
Exerc Sport Sci Rev 29:26-31. 2001..The objective is to challenge muscle systems to achieve sufficient functional stability but in a way that spares the spine of excessive exacerbating load... - Atlas-axis facet asymmetry. Implications in manual palpationJ K Ross
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 24:1203-9. 1999..For spine palpation to be a valid indicator for manipulation, the clinician applying it must first be able to differentiate between asymmetrical motion caused by vertebral fixation and that caused by asymmetrical joint anatomy... - Classification of low back pain with the use of spectral electromyogram parametersJ P Peach
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 23:1117-23. 1998..Models based on 60% of maximum voluntary contraction demonstrated results comparable with those of previous research using 40% and 80% of maximum voluntary contraction... - Spinal posture and prior loading history modulate compressive strength and type of failure in the spine: a biomechanical study using a porcine cervical spine modelJ L Gunning
Department of Kinesiology, Spine Biomechanics Laboratory, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON, Canada N2L 3G1
Clin Biomech (Bristol, Avon) 16:471-80. 2001..Loading history also modulated the site of failure. CONCLUSIONS: The spine may be more prone to injury early in the morning when the discs are at their greatest level of hydration and/or when they are in a fully flexed posture... - On the implications of interpreting the stability index: a spine exampleS J Howarth
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Waterloo, Ont, Canada N2L 3G1
J Biomech 37:1147-54. 2004..However they appear to differ in their sensitivity to the effect of muscle activation patterns... - Traction may enhance the imaging of spine injuries with plane radiographs: implications for the laboratory versus the clinicS M McGill
Faculty of Applied Health Sciences, Department of Kinesiology, University of Waterloo, Ont, Canada
Clin Biomech (Bristol, Avon) 14:291-5. 1999..It was hypothesized that traction loads would enhance injury manifestation on planar radiographic images... - Estimation of force and extensor moment contributions of the disc and ligaments at L4-L5S M McGill
Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 13:1395-402. 1988..Simulated compressive loads of 6300 N were noted to allow an additional 2 degrees of flexion at the joint... - Changes in spine length during and after seated whole-body vibrationA Sullivan
Department of Kinesiology, University of Waterloo, Ontario, Canada
Spine (Phila Pa 1976) 15:1257-60. 1990..It is hypothesized that this "rebound" effect is due to an inflammatory response in the spine... - Quantification of the differences in electromyographic activity magnitude between the upper and lower portions of the rectus abdominis muscle during selected trunk exercisesG J Lehman
University of Waterloo-Canadian Memorial Chiropractic College (UW-CMCC) Research Clinic, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
Phys Ther 81:1096-101. 2001..DISCUSSION AND CONCLUSION: Normalizing the EMG signal led the authors to believe that the differences between the portions of the rectus abdominis muscle are small and may lack clinical or therapeutic relevance... - A comparison of lumbar range of motion and functional ability scores in patients with low back pain: assessment for range of motion validityK A Parks
Faculty of Applied Health Sciences, University of Waterloo, Waterloo, Ontario, Canada
Spine 28:380-4. 2003..This has implications for clinical practice as it relates to disability determination for patients with chronic low back pain, and perhaps for the current impairment guidelines of the American Medical Association...