Effects of prolonged walking with backpack loads on trunk muscular adaptation in children
Chapter in an edited book (author)


香港中文大学研究人员 ( 现职)

方迪培教授 (体育运动科学系)

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摘要This study investigated effect of prolonged walking with load carriage on muscle activity and fatigue in children. Fifteen Chinese male children (age = 6 years, height = 12http://aims.cuhk.edu.hk/converis/portal/Publication/0.http://aims.cuhk.edu.hk/converis/portal/Publication/0 ± 5.4 cm, mass = 22.9 ± 2.6 kg) performed 2http://aims.cuhk.edu.hk/converis/portal/Publication/0-minute walking trials on treadmill (speed = 1.1 ms-1) with different backpack loads (http://aims.cuhk.edu.hk/converis/portal/Publication/0%, 1http://aims.cuhk.edu.hk/converis/portal/Publication/0%, 15% and 2http://aims.cuhk.edu.hk/converis/portal/Publication/0% body weight). Electromyography (EMG) signals from upper trapezius, lower trapezius and rectus abdominis were recorded at several time intervals (http://aims.cuhk.edu.hk/converis/portal/Publication/0, 5, 1http://aims.cuhk.edu.hk/converis/portal/Publication/0, 15 and 2http://aims.cuhk.edu.hk/converis/portal/Publication/0 minutes), and were normalized to the signals collected during maximum voluntary contraction. Integrated EMG signal (IEMG) was calculated to evaluate the muscle activity. Power spectral frequency analysis was applied to evaluate muscle fatigue by the shift of median power frequency (MPF). Results showed that a 15% body weight load significantly increased muscle activity at lower trapezius when the walking time reached 15 minutes. When a 2http://aims.cuhk.edu.hk/converis/portal/Publication/0% body weight load was being carried, increase in muscle activity was found from 5 minutes, and muscle fatigue was found from 15 minutes. In upper trapezius, increase of muscle activity was not found within the 2http://aims.cuhk.edu.hk/converis/portal/Publication/0-minute period, however, muscle fatigue was found from 1http://aims.cuhk.edu.hk/converis/portal/Publication/0 minutes. No increased muscle activity or muscle fatigue was found in rectus abdominis. It is suggested that backpack loads for children should be restricted to no more than 15% body weight for walks of up to 2http://aims.cuhk.edu.hk/converis/portal/Publication/0 minutes duration to avoid muscle fatigue ? 2http://aims.cuhk.edu.hk/converis/portal/Publication/01http://aims.cuhk.edu.hk/converis/portal/Publication/0 by Nova Science Publishers, Inc. All rights reserved.

着者Hong Y., Fong D.T.-P., Li J.-X.
编辑ed. by Y Hong.
详细描述ed. by Y Hong.
出版年份2http://aims.cuhk.edu.hk/converis/portal/Publication/01http://aims.cuhk.edu.hk/converis/portal/Publication/0
月份12
日期1
页次171 - 181
国际标準书号9781616686222
语言英式英语