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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., (Copyright © 2013 Elsevier Inc. All rights reserved.)

21398167 23 Kim C.-Y., Choi J.-D., Kim S.-Y., Oh D.-W., Kim J.-K., Park J.-W. Comparison between muscle activation measured by electromyography and muscle thickness measured using ultrasonography for effective muscle assessment. EMG, ultrasound imaging, low back pain, erector spinae muscle, thoracolumbar fascia, multifidus muscle, muscle spindle Keywords: EMG; ultrasound imaging; low back pain; thoracolumbar fascia; erector spinae muscle; multifidus muscle; muscle spindle EN EMG ultrasound imaging low back pain thoracolumbar fascia erector spinae muscle multifidus muscle muscle spindle 1735 16 11/17/22 20221101 NES 221101 1. ES, erector spinae muscle; LD, latissimus dorsi muscle; SPI, serratus posterior inferior muscle; TLF, thoracolumbar fascia; sEMG, surface electromyography; orange dot shows the LD/TLF junction. [Extracted from the article]

BACKGROUND: The erector spinae is more resistant to fatigue in adult women than men. However, no study has reported the sex differences in back muscle fatigue in children. OBJECTIVE: The aim of this study was to evaluate the fatigability of erector spinae in prepubertal children and adults, in both males and females. METHODS: Fourteen prepubertal boys, 13 prepubertal girls, 14 adult men, and 13 adult women performed the Sørensen back isometric endurance test until exhaustion. The results of electromyographic (EMG) power spectral analysis of erector spinae were compared between both age groups and sexes. RESULTS: The slopes of EMG power spectral median and mean power frequency were significantly higher in males than in females, in both age groups. Furthermore, the slopes were significantly lower in prepubertal children than in adults, in both males and females. CONCLUSIONS: Our results showed major differences in the fatigue threshold of the erector spinae between boys and girls and children and adults. The muscle fatigued faster in prepubertal boys and adult men than in prepubertal girls and adult women. In both sexes, a lower slope of EMG power spectrum parameters of the erector spinae was noted during endurance test in prepubertal children compared to adults. [ABSTRACT FROM AUTHOR]

The effects of work strategy and a rest condition on the physiological changes of the erector spinae muscle were studied. Eleven volunteers repeated fatiguing static contractions of holding an industrial box in 30° trunk flexion for a repetition of 12 times interrupted by rests for which the duration was equal to the duration of each preceding contraction. Each contraction was stopped at two fatigue sensation levels; moderate or strong, which corresponded to Borg's CR-10 3 and 5, as the work strategy conditions. The repeated contractions were performed for a total of eight conditions combined with the two rest conditions, with and without stretch exercise, and two contraction levels of 10 and 40% maximum pulling force in flexed posture (MVC) on separate days. Near-infrared spectroscopy and surface electromyography (EMG) were recorded. Amplitude and median frequency (MF) of EMG, oxy-hemoglobin, and deoxy-hemoglobin were calculated. MF related to fatigue sensation most closely. Oxy-hemoglobin decreased during each contraction. It, however, increased with repetition especially at 10% MVC and the increase was interpreted as adaptation to the work. The effect of the work strategy and the rest conditions was weak. MF decreased more in a strong work strategy condition than in a moderate one. [ABSTRACT FROM AUTHOR]