Strength training alters contractile properties of the triceps brachii in men aged 65-78 years.

摘要: Voluntary and electrically evoked contractile properties were studied in the triceps brachii following a 24-week dynamic stength training program ten men aged 65–78 years. Eight of similar age control subjects. A resistance overload was undertaken three times per week with subjects performing four sets six to eight repetitions at 80% their one repetition maximum (1RM). Maximum voluntary contraction (MVC) measured 0, 12, 24 weeks exercise group 0 controls. The 1RM used assess strength group. Contractile measures consisted supramaximal isometric twitch post-activation parameters. Muscle size estimated from anthropometric measurements. Compared group, MVC increased by about 20% time peak tension slowed 11%. Also rate torque development potentiated reduced 10%. Twitch potentiation substantial both groups (about 140%) unaffected training. 1 RM 30%, there non-singificant positive change 8.6% muscle plus bone cross-sectional area results show that force generating capacity these can be significantly improved for up using concentric Furthermore, finding no amplitude substantiate extend limited data currently available on intrinsic changes elderly. Mechanisms responsible functional significance remain uncertain.