Papers by Cheryl Hubley-kozey
Journal of Motor Behavior, Apr 25, 2018
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Ergonomics, Apr 27, 2010
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Journal of Motor Behavior, Apr 25, 2018
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Ergonomics, Apr 27, 2010
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Human Movement Science, Dec 1, 2014
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Human Movement Science, Dec 1, 2014
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Physical & Occupational Therapy in Geriatrics, Oct 1, 2016
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Orthopaedic Proceedings, Mar 1, 2008
The objective of this study was to determine if abnormal neuromuscular patterns exist in individu... more The objective of this study was to determine if abnormal neuromuscular patterns exist in individuals with knee Osteoarthritis compared to those with healthy knees. We collected surface electromyographic signals during preferred speed and fast walk conditions from seven muscles crossing the knee joint. We found differences between the two groups that could lead to differences in joint loading, with the OA group having higher coactivity between hamstrings and quadriceps during initial loading. Further investigating these differences is warranted in particular given the trend for lower external extensor moments for the OA group at the fast walking speed. The purpose of this study was to compare neuromuscular control of knee joint motion during walking between those with moderate Osteoarthritis (OA) and those with healthy knees (CON). Moderate OA neuromuscular control patterns differed from those with healthy knees. Detecting neuromuscular alteration associated with mild to moderate knee OA is important to direct therapeutic strategies aimed to slow down or possibly reverse disease progression. Surface electromyographic (EMG) recordings were collected from seven muscles crossing the knee joint of CON (n=7) and those with moderate OA (n=4) during preferred speed and a fast-paced walks. A pattern recognition technique was applied to the EMG profiles. No differences (>0.05) were reported between the two groups for spatial and temporal gait parameters or knee joint kinematics. Statistical differences were found (p The disproportionately higher knee flexor coactivity at heel strike may reflect a guarded response to pain, whereas the burst during weight transfer may reflect a stabilizing response as the knee moment changes from a flexor to an extensor moment. At normal walking speeds the neuromuscular control patterns were similar between groups, but differences were exaggerated when the system was stressed at higher speed.
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Physical & Occupational Therapy in Geriatrics, Oct 1, 2016
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BMC Geriatrics, Dec 1, 2008
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Osteoarthritis and Cartilage, 2019
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Circulation, 1992
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Orthopaedic Proceedings, Mar 1, 2008
The objective of this study was to determine if abnormal neuromuscular patterns exist in individu... more The objective of this study was to determine if abnormal neuromuscular patterns exist in individuals with knee Osteoarthritis compared to those with healthy knees. We collected surface electromyographic signals during preferred speed and fast walk conditions from seven muscles crossing the knee joint. We found differences between the two groups that could lead to differences in joint loading, with the OA group having higher coactivity between hamstrings and quadriceps during initial loading. Further investigating these differences is warranted in particular given the trend for lower external extensor moments for the OA group at the fast walking speed. The purpose of this study was to compare neuromuscular control of knee joint motion during walking between those with moderate Osteoarthritis (OA) and those with healthy knees (CON). Moderate OA neuromuscular control patterns differed from those with healthy knees. Detecting neuromuscular alteration associated with mild to moderate knee OA is important to direct therapeutic strategies aimed to slow down or possibly reverse disease progression. Surface electromyographic (EMG) recordings were collected from seven muscles crossing the knee joint of CON (n=7) and those with moderate OA (n=4) during preferred speed and a fast-paced walks. A pattern recognition technique was applied to the EMG profiles. No differences (>0.05) were reported between the two groups for spatial and temporal gait parameters or knee joint kinematics. Statistical differences were found (p The disproportionately higher knee flexor coactivity at heel strike may reflect a guarded response to pain, whereas the burst during weight transfer may reflect a stabilizing response as the knee moment changes from a flexor to an extensor moment. At normal walking speeds the neuromuscular control patterns were similar between groups, but differences were exaggerated when the system was stressed at higher speed.
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Osteoarthritis and Cartilage, Sep 1, 2011
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Archives of Physical Medicine and Rehabilitation, Feb 1, 2005
To compare relative activation amplitudes among abdominal and trunk extensor muscle sites of heal... more To compare relative activation amplitudes among abdominal and trunk extensor muscle sites of healthy people performing a leg-loading exercise protocol aimed at progressively challenging spinal stability. A prospective, comparative, repeated-measures design. Motion analysis research laboratory. Eighteen healthy male and female volunteers (mean age +/- standard deviation, 23.8+/-3.4y). Subjects performed 5 progression levels in random order, while surface electromyograms were recorded from 5 abdominal and 2 back extensor muscle sites. Levels 2 through 5 were of interest because they included a leg-extension phase. The root mean square (RMS) amplitude during the leg-extension phase was calculated and normalized to maximal voluntary isometric contractions (MVICs) for each muscle. A 2-factor repeated-measures analysis of variance tested the muscle-by-level interactions and the 2 main effects for the abdominal and trunk extensor sites separately. Bonferroni adjustments were performed on significant results. Normalized RMS (NRMS) amplitude for each muscle during the leg-extension phase. There were statistically significant muscle-by-level interactions (P<.05) for both abdominal and trunk extensor sites. The relative amplitudes increased for the abdominal muscles and erector spinae muscles among levels, except between levels 3 and 4. Significant differences were found among the abdominal muscle sites for the lower-level exercises (levels 2-4), but not for level 5. The highest NRMS amplitude was at level 5, that is, 40% of MVIC. The patterns of activation amplitudes differed among levels; therefore, this was not a simple progressive loading protocol because muscles responded in a nonuniform manner to the demands associated with the various levels of progression. Based on the results, the protocol met some of the objectives of dynamic stability protocols.
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Osteoarthritis and Cartilage, May 1, 2010
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Clinical Biomechanics, Nov 1, 2002
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Archives of Physical Medicine and Rehabilitation, Aug 1, 2002
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Disability and Rehabilitation: Assistive Technology, May 22, 2014
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Papers by Cheryl Hubley-kozey