Background Context: Previous studies reported that the erector spinae muscle is more resistant to fatigue in healthy adult women than in men. However, no study has reported changes in back muscle fatigue with aging in healthy men and women.
Purpose: The aim of this study was to evaluate age-related changes in muscle fatigue of erector spinae muscle in men and women.
Study Design/setting: This cross-sectional study was conducted in a laboratory.
Patient Sample: Fifty-three healthy subjects (11 elderly men, 11 elderly women, 17 young men, and 14 young women) without low back pain history.
Outcome Measures: The median frequency (MF) and mean power frequency (MPF) during trunk holding test were derived from the raw electromyographic (EMG) signal using Fast Fourier Transform spectrum analysis program. The rates of changes in MF and MPF were calculated.
Methods: Subjects performed the unsupported trunk holding test until exhaustion. The results of power spectral analysis of the EMG activity of the left erector spinae muscle were compared in both age groups and sexes.
Results: The endurance time in young men was significantly shorter than in young women. The slopes of MF and MPF in young men were significantly higher than in young women. There were no significant differences in MF and MPF slopes of elderly men and elderly women. Furthermore, the MF and MPF slopes were significantly lower in elderly men than young men but similar in the two women groups.
Conclusions: Age-related changes in the slopes of MF and MPF of erector spinae muscle occur in healthy men but not in healthy women.
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| http://dx.doi.org/10.1016/j.spinee.2013.06.060 | DOI Listing |
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