Searching for just a few words should be enough to get started. If you need to make more complex queries, use the tips below to guide you.
Article type: Research Article
Authors: Lindström, Brittaa | Karlsson, J. Stefanb | Lexell, Janb
Affiliations: [a] Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå Sweden | [b] Department of Biomedical Engineering and Informatics, University Hospital, Umeå Sweden
Note: [] Address for correspondence: Britta Lindström, Department of Community Medicine and Rehabilitation, Physiotherapy, Building 15, Umeå University, Sweden, 901 87 Umeå Sweden. Tel.: +46 90 786 92 68; Fax: +46 90 786 91 10; E-mail: [email protected]
Abstract: The overall aim was to investigate the fatigue pattern and perceived fatigue during repetitive dynamic contractions in young and older men and women. Sixteen older men and women (mean age 73 ± 3 years) and 22 young men and women (mean age 28 ± 6 years) performed 100 repeated maximum concentric isokinetic knee extension contractions at 90°·s^{-1} (1.57 rad·s^{-1}). Throughout the 100 contractions, peak torque (PT) and surface electromyography (EMG) signals from the rectus femoris muscle and the vastus lateralis muscle were recorded simultaneously, together with perceived fatigue (CR-10 scale of Borg). The mean frequency of the power spectrum (MNF) and the root mean square of the signal amplitude (RMS) of the EMG were affected by age and with a sex related difference but for PT the difference of the fatigue pattern was most evident between the sexes. In addition, the young men rated the highest fatigue. Based on EMG, PT and ratings of perceived fatigue it was concluded that the old men fatigued most, the old women fatigued least and the young men perceived greatest fatigue.
Keywords: Aging, electromyography, muscle, skeletal, muscle contraction, muscle fatigue, sex factors
DOI: 10.3233/IES-2006-0228
Journal: Isokinetics and Exercise Science, vol. 14, no. 3, pp. 225-234, 2006
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
USA
Tel: +1 703 830 6300
Fax: +1 703 830 2300
[email protected]
For editorial issues, like the status of your submitted paper or proposals, write to [email protected]
IOS Press
Nieuwe Hemweg 6B
1013 BG Amsterdam
The Netherlands
Tel: +31 20 688 3355
Fax: +31 20 687 0091
[email protected]
For editorial issues, permissions, book requests, submissions and proceedings, contact the Amsterdam office [email protected]
Inspirees International (China Office)
Ciyunsi Beili 207(CapitaLand), Bld 1, 7-901
100025, Beijing
China
Free service line: 400 661 8717
Fax: +86 10 8446 7947
[email protected]
For editorial issues, like the status of your submitted paper or proposals, write to [email protected]
如果您在出版方面需要帮助或有任何建, 件至: [email protected]