Porter M M, Vandervoort A A, Kramer J F
Department of Physical Therapy and Faculty of Kinesiology, University of Western Ontario, Canada.
J Gerontol A Biol Sci Med Sci. 1997 Mar;52(2):B125-31. doi: 10.1093/gerona/52a.2.b125.
Although a relative preservation of eccentric (ECC) strength with age has been reported previously, this phenomenon has not been studied in lower leg muscles. Concentric (CONC) and ECC plantar (PF) and dorsiflexion (DF) in healthy active older women (OW; n = 16, age = 67 +/- 4 years) and younger women (YW; n = 16, age = 27 +/- 4 years) were studied. Passive resistive torque of the plantar flexors and average rate of torque development (RTD) for both DF and PF were also measured. The OW had CONC peak torques that were 74% and 89% of the YW for PF and DF, whereas ECC peak torques were 97% and 100% of the YW. ECC torque patterns were almost identical for both groups, but there were significant differences for passive resistive torque (OW > YW; p < .01) and CONC RTD (OW < YW; p < .05). While increased passive resistive torque did not prove to be influential in maintaining ECC strength with age, it had a negative effect on CONC DF function.
尽管先前已有报道称随着年龄增长离心（ECC）力量相对保持，但小腿肌肉的这种现象尚未得到研究。本研究对健康活跃的老年女性（OW；n = 16，年龄 = 67±4岁）和年轻女性（YW；n = 16，年龄 = 27±4岁）的向心（CONC）和离心（ECC）跖屈（PF）及背屈（DF）情况进行了研究。同时还测量了跖屈肌的被动阻力矩以及DF和PF的平均扭矩发展速率（RTD）。OW的PF和DF的CONC峰值扭矩分别为YW的74%和89%，而ECC峰值扭矩分别为YW的97%和100%。两组的ECC扭矩模式几乎相同，但被动阻力矩存在显著差异（OW > YW；p < 0.01），CONC RTD也存在显著差异（OW < YW；p < 0.05）。虽然增加的被动阻力矩并未被证明对随年龄保持ECC力量有影响，但它对CONC DF功能有负面影响。
