Porter M M, Myint A, Kramer J F, Vandervoort A A
Faculty of Kinesiology, University of Western Ontario, London.
Can J Appl Physiol. 1995 Dec;20(4):429-39. doi: 10.1139/h95-034.
Decrements in isometric and concentric (Conc) muscular strength with increased age are well documented. However, little information is available on the effects of aging on eccentric (Ecc) strength, even though Ecc or lengthening muscle actions are used in most physical activities. This study examined Conc and Ecc peak torques (PT) during knee extension at 90 degrees/sec in healthy older (62 to 89 yrs) and younger (20 to 29 yrs) men and women. Conc PT decreased more with age than did Ecc (p < 0.01), for both men and women. PT values for the older men and women as a percentage of those of the younger ones were 58.3 and 46.6% for Conc, and 75.1 and 61.7% for Ecc, respectively. These age differences need to be considered during isokinetic evaluations of Conc versus Ecc strength. Other muscle groups should be investigated, and mechanisms remain to be determined.
随着年龄增长，等长和向心（Conc）肌肉力量下降已有充分记录。然而，关于衰老对离心（Ecc）力量的影响，即便在大多数体育活动中都使用了离心或肌肉拉长动作，相关信息却很少。本研究检测了健康老年（62至89岁）和年轻（20至29岁）男性与女性在膝关节以90度/秒伸展时的向心和离心峰值扭矩（PT）。男性和女性的向心PT随年龄下降幅度均大于离心PT（p < 0.01）。老年男性和女性的PT值分别占年轻者PT值的百分比，向心为58.3%和46.6%，离心为75.1%和61.7%。在等速评估向心与离心力量时，需要考虑这些年龄差异。其他肌肉群也应进行研究，且作用机制仍有待确定。
