期刊
AGING CLINICAL AND EXPERIMENTAL RESEARCH
卷 28, 期 4, 页码 713-720出版社
SPRINGER
DOI: 10.1007/s40520-015-0482-5
关键词
Physical activity; Electromyography; Independent living; Energy expenditure; Aging
资金
- Academy of Finland [128643]
- Urheiluopistosaatio
- Ellen and Artturi Nyyssosen saatio
- Shanghai Jiao Tong University
- Academy of Finland (AKA) [128643, 128643] Funding Source: Academy of Finland (AKA)
Background Daily muscle activity is important for functional independence. This study examined muscle activity patterns during normal daily life and simulated daily tasks and compared muscle activity and energy consumption during active and passive transport tasks in older adults. Methods Nine volunteers (70 +/- 6 years) were measured for quadriceps and hamstring muscle activity (EMG) during normal daily life, treadmill walking, and during passive and active transport tasks. EMG was normalized to that recorded during maximal voluntary contraction (MVC). Oxygen uptake (VO2) was measured during treadmill and transport tasks. Results During daily life the mean EMG amplitude was 5.9 +/- 2.4 % of EMG(MVC), activity time was 187 +/- 43 min and the longest continuous inactivity periods were 20.9 +/- 10.0 min. During stair ascend the peak EMG activity was 120 % of EMG(MVC) and the peak VO2 values were only about 70 % of VO2max. One kilometer walk consumed 3.5 times more energy than passive transport by bus, and using stairs consumed 11.7 times more energy than using an elevator. Conclusions In daily life, older adults use only a small fraction of muscle's maximal capacity and have long continuous inactivity periods. Negotiating stairs produce significant load to neuromuscular, but not to cardiovascular system, thus providing an effective strength training stimulus.
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