Differences in abdominal muscle activation patterns of younger and older adults performing an asymmetric leg-loading task

PM & R : the Journal of Injury, Function, and Rehabilitation
Cheryl L Hubley-KozeyMelissa D McKeon

Abstract

To determine whether differences exist between younger (20-50 years) and older adults (>65 years) in abdominal muscle amplitudes, temporal patterns, and three-dimensional (3D) pelvic motion, while performing an asymmetric leg-loading task. Cross-sectional. Neuromuscular function laboratory. Ten healthy younger (33.3 +/- 7.7 years) and 10 healthy gender- and body mass index-matched older adults (69.0 +/- 6.6 years). Surface electromyograms from 6 abdominal muscle sites bilaterally and pelvic motions were simultaneously recorded. Root mean square (RMS) amplitude during the leg extension phase was calculated for each muscle. Ensemble average waveforms for the total exercise were analyzed using principal component (PC) analysis. Total angular displacement of the pelvis was calculated. Student t tests were performed on demographic and angular displacement data. Three-factor mixed model analysis of variances (group, muscle, side) tested main effects and interactions (P < .05) for the RMS amplitude and PC scores from the temporal waveforms. Bonferroni post-hoc analyses tested pair-wise differences. There were no between-group differences for the pelvic motions. Three PC patterns captured 85% of the variance in the waveforms. The exter...Continue Reading

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Citations

Oct 22, 2013·Archives of Physical Medicine and Rehabilitation·Janice M MoresideCheryl L Hubley-Kozey
Oct 26, 2011·PM & R : the Journal of Injury, Function, and Rehabilitation·Edwin Y HanadaCheryl Hubley-Kozey
Jan 9, 2015·Journal of Neuroengineering and Rehabilitation·Thomas KienbacherGerold Ebenbichler
Apr 26, 2018·Journal of Motor Behavior·D Adam Quirk, Cheryl L Hubley-Kozey

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