Robert J Gregor

Summary

Affiliation: Georgia Institute of Technology
Country: USA

Publications

  1. ncbi Mechanics of slope walking in the cat: quantification of muscle load, length change, and ankle extensor EMG patterns
    Robert J Gregor
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, Georgia 30332 0356, USA
    J Neurophysiol 95:1397-409. 2006
  2. ncbi Locomotor changes in length and EMG activity of feline medial gastrocnemius muscle following paralysis of two synergists
    Huub Maas
    School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA, USA
    Exp Brain Res 203:681-92. 2010
  3. ncbi Distinct muscle fascicle length changes in feline medial gastrocnemius and soleus muscles during slope walking
    Huub Maas
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, Georgia, USA
    J Appl Physiol 106:1169-80. 2009
  4. ncbi Effectiveness of force production in persons with unilateral transtibial amputation during cycling
    Walter Lee Childers
    Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    Prosthet Orthot Int 35:373-8. 2011
  5. ncbi Short-term motor compensations to denervation of feline soleus and lateral gastrocnemius result in preservation of ankle mechanical output during locomotion
    Boris I Prilutsky
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    Cells Tissues Organs 193:310-24. 2011
  6. ncbi The effects of sloped surfaces on locomotion: an electromyographic analysis
    Andrea N Lay
    Bioengineering Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    J Biomech 40:1276-85. 2007
  7. ncbi Characterization of a system for studying human gait during slope walking
    Andrea N Lay
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA 30332-0356, USA
    J Appl Biomech 21:153-66. 2005
  8. ncbi The effects of sloped surfaces on locomotion: a kinematic and kinetic analysis
    Andrea N Lay
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, 281 Ferst Drive, Atlanta, GA 30332 0356, USA
    J Biomech 39:1621-8. 2006
  9. ncbi The effects of self-reinnervation of cat medial and lateral gastrocnemius muscles on hindlimb kinematics in slope walking
    Huub Maas
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, GA, USA
    Exp Brain Res 181:377-93. 2007
  10. ncbi Pedaling asymmetries in cyclists with unilateral transtibial amputation: effect of prosthetic foot stiffness
    W Lee Childers
    School of Applied Physiology, Georgia Institute of Technology, Atlanta, Georgia, USA
    J Appl Biomech 27:314-21. 2011

Collaborators

Detail Information

Publications20

  1. ncbi Mechanics of slope walking in the cat: quantification of muscle load, length change, and ankle extensor EMG patterns
    Robert J Gregor
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, Georgia 30332 0356, USA
    J Neurophysiol 95:1397-409. 2006
    ..It was suggested that these differences between upslope and downslope walking might affect motion-dependent feedback, resulting in muscle activity changes recorded here or reported in the literature...
  2. ncbi Locomotor changes in length and EMG activity of feline medial gastrocnemius muscle following paralysis of two synergists
    Huub Maas
    School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA, USA
    Exp Brain Res 203:681-92. 2010
    ....
  3. ncbi Distinct muscle fascicle length changes in feline medial gastrocnemius and soleus muscles during slope walking
    Huub Maas
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, Georgia, USA
    J Appl Physiol 106:1169-80. 2009
    ..It was further suggested that the potential role of length feedback from muscle spindles is both task and muscle dependent...
  4. ncbi Effectiveness of force production in persons with unilateral transtibial amputation during cycling
    Walter Lee Childers
    Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    Prosthet Orthot Int 35:373-8. 2011
    ..Few published reports exist regarding the control of the human/prosthesis interface in persons with unilateral transtibial amputation...
  5. ncbi Short-term motor compensations to denervation of feline soleus and lateral gastrocnemius result in preservation of ankle mechanical output during locomotion
    Boris I Prilutsky
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    Cells Tissues Organs 193:310-24. 2011
    ....
  6. ncbi The effects of sloped surfaces on locomotion: an electromyographic analysis
    Andrea N Lay
    Bioengineering Program, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    J Biomech 40:1276-85. 2007
    ..Collectively these data suggest that the nervous system uses different control strategies to successfully locomote on slopes, and that joint power requirements are an important factor in determining these control strategies...
  7. ncbi Characterization of a system for studying human gait during slope walking
    Andrea N Lay
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, Atlanta, GA 30332-0356, USA
    J Appl Biomech 21:153-66. 2005
    ..Collectively, data from all tests demonstrate the fidelity of this ramp system and suggest it can be used to evaluate human locomotion over a range of slope intensities...
  8. ncbi The effects of sloped surfaces on locomotion: a kinematic and kinetic analysis
    Andrea N Lay
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, 281 Ferst Drive, Atlanta, GA 30332 0356, USA
    J Biomech 39:1621-8. 2006
    ..This non-uniform distribution of joint moment increases during up- and downslope walking compared to level walking suggests that these three tasks are not governed by the same control strategy...
  9. ncbi The effects of self-reinnervation of cat medial and lateral gastrocnemius muscles on hindlimb kinematics in slope walking
    Huub Maas
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, GA, USA
    Exp Brain Res 181:377-93. 2007
    ..Full recovery of hindlimb kinematics during level and upslope walking suggests that the proprioceptive loss is compensated by other sensory sources (e.g. cutaneous receptors) or altered central drive...
  10. ncbi Pedaling asymmetries in cyclists with unilateral transtibial amputation: effect of prosthetic foot stiffness
    W Lee Childers
    School of Applied Physiology, Georgia Institute of Technology, Atlanta, Georgia, USA
    J Appl Biomech 27:314-21. 2011
    ..1% and 21.7%, and the intact group displayed 4.3% and 4.2%, respectively. Similar trends were shown in the low difficulty condition. These data suggest foot stiffness has an effect on cycling symmetry in amputees...
  11. ncbi Stance and swing phase detection during level and slope walking in the cat: effects of slope, injury, subject and kinematic detection method
    Annette Pantall
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, GA 30332 0356, USA
    J Biomech 45:1529-33. 2012
    ..It was concluded that timing of gait events can be determined consistently using kinematics, although adjustments must be made to account for the systematic error which varies according to subject and slope condition...
  12. ncbi The effects of sloped surfaces on locomotion: backward walking as a perturbation
    Andrea N Lay
    Bioengineering Program, School of Mechanical Engineering, Georgia Institute of Technology, GA, USA
    J Biomech 40:3050-5. 2007
    ..In total, these data suggest that changing power requirements at a joint impact the control of muscle activity at that and adjacent joints...
  13. ncbi Quantification of motor cortex activity and full-body biomechanics during unconstrained locomotion
    Boris I Prilutsky
    School of Applied Physiology, Center for Human Movement Studies, Georgia Institute of Technology, Atlanta, 30332 0356, USA
    J Neurophysiol 94:2959-69. 2005
    ..We conclude that comparison of motor cortex activity with full-body biomechanics may be a useful tool in further elucidating the function of the motor cortex...
  14. ncbi The influence of Tai Chi training on the center of pressure trajectory during gait initiation in older adults
    Chris J Hass
    Department of Neurology, Emory University School of Medicine, Atlanta, GA 30332, USA
    Arch Phys Med Rehabil 85:1593-8. 2004
    ..To determine if a program of intense Tai Chi exercise that has been shown to reduce the risk of falling in older adults improves postural control by altering the center of pressure (COP) trajectory during gait initiation...
  15. ncbi The biomechanics of cycling with a transtibial amputation: Recommendations for prosthetic design and direction for future research
    W Lee Childers
    School of Applied Physiology, Georgia Institute of Technology, Atlanta, Georgia 30332 0356, USA
    Prosthet Orthot Int 33:256-71. 2009
    ..The article will include recommendations for prosthetic design and modification of the bicycle to improve cycling performance for CTA at all experience levels...
  16. ncbi Temporal and spatial features of gait in older adults transitioning to frailty
    Reto W Kressig
    Center for Human Movement Studies, School of Applied Physiology, Georgia Institute of Technology, 281 Ferst Drive, Atlanta, GA 30332-0356, USA
    Gait Posture 20:30-5. 2004
    ..These data suggest that the temporal and spatial gait features of these older adults differ substantially from published results from other older adults...
  17. ncbi ACSM: biomechanics of movement and performance
    Robert J Gregor
    Georgia Institute of Technology, Atlanta, USA
    Med Sci Sports Exerc 35:1797. 2003
  18. ncbi Gait initiation in older adults with postural instability
    Chris J Hass
    Department of Applied Physiology and Kinesiology, University of Florida, Box 118205, Gainesville, FL 32611 8205, USA
    Clin Biomech (Bristol, Avon) 23:743-53. 2008
    ..This study examined changes in the translation of the center of pressure during forward and lateral (90 degrees to the side) gait initiation in two populations of older adults with postural instability...
  19. ncbi Lower extremity general muscle moment patterns in healthy individuals during recumbent cycling
    Scott M Gregor
    VA Greater Los Angeles Healthcare System, West Los Angeles Healthcare Center, PM and R Gait Laboratory (117G, 11301 Wilshire Boulevard, Los Angeles, CA 90073, USA
    Clin Biomech (Bristol, Avon) 17:123-9. 2002
    ..The current study is the first such investigation to report normative data of lower extremity general muscle moment patterns during recumbent cycling. Effects of age and workload were also demonstrated...
  20. ncbi Gait initiation and dynamic balance control in Parkinson's disease
    Chris J Hass
    Department of Biobehavioral Sciences, Teachers College Columbia University, New York, NY 10027, USA
    Arch Phys Med Rehabil 86:2172-6. 2005
    ....