Theou Olga, Edwards Darl, Jones Gareth R, Jakobi Jennifer M
Geriatric Medicine, Dalhousie University, 5955 Veterans' Memorial Lane, Halifax, NS, Canada B3H 2E1.
J Aging Res. 2013;2013:720246. doi: 10.1155/2013/720246. Epub 2013 Jul 31.
The rapid advancement of electromyography (EMG) technology facilitates measurement of muscle activity outside the laboratory during daily life. The purpose of this study was to determine whether bursts in EMG recorded over a typical 8-hour day differed between young and old males and females. Muscle activity was recorded from biceps brachii, triceps brachii, vastus lateralis, and biceps femoris of 16 young and 15 old adults using portable surface EMG. Old muscles were active 16-27% of the time compared to 5-9% in young muscles. The number of bursts was greater in old than young adults and in females compared to males. Burst percentage and mean amplitude were greater in the flexor muscles compared with the extensor muscles. The greater burst activity in old adults coupled with the unique activity patterns across muscles in males and females provides further understanding of how changes in neuromuscular activity effects age-related functional decline between the sexes.
肌电图（EMG）技术的快速发展有助于在日常生活中于实验室外测量肌肉活动。本研究的目的是确定在典型的8小时工作日期间，年轻和老年男性及女性记录的肌电图爆发情况是否存在差异。使用便携式表面肌电图记录了16名年轻成年人和15名老年成年人肱二头肌、肱三头肌、股外侧肌和股二头肌的肌肉活动。老年肌肉的活跃时间为16% - 27%，而年轻肌肉为5% - 9%。老年成年人的爆发次数多于年轻成年人，女性的爆发次数多于男性。与伸肌相比，屈肌的爆发百分比和平均振幅更大。老年成年人中更大的爆发活动以及男性和女性不同肌肉间独特的活动模式，进一步加深了我们对神经肌肉活动变化如何影响不同性别与年龄相关的功能衰退的理解。
