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首页> 美国卫生研究院文献>Age >Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained
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Older men are more fatigable than young when matched for maximal power and knee extension angular velocity is unconstrained

机译：当匹配最大功率并且膝盖伸展角速度不受限制时年长的男人比年轻的男人更容易疲劳。

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The underlying factors related to the divergent findings of age-related fatigue for dynamic tasks are not well understood. The purpose here was to investigate age-related fatigability and recovery between a repeated constrained (isokinetic) and an unconstrained velocity (isotonic) task, in which participants performed fatiguing contractions at the velocity (isokinetic) or resistance (isotonic) corresponding with maximal power. To compare between tasks, isotonic torque–power relationships were constructed prior to and following both fatiguing tasks and during short-term recovery. Contractile properties were recorded from 9 old (~75 years) and 11 young (~25 years) men during three testing sessions. In the first session, maximal power was assessed, and sessions 2 and 3 involved an isokinetic or an isotonic concentric fatigue task performed until maximal power was reduced by 40 %. Compared with young, the older men performed the same number of contractions to task failure for the isokinetic task (~45 contractions), but 20 % fewer for the isotonic task (p < 0.05). Regardless of age and task, maximal voluntary isometric contraction strength, angular velocity, and power were reduced by ~30, ~13, and ~25 %, respectively, immediately following task failure, and only isometric torque was not recovered fully by 10 min. In conclusion, older men are more fatigable than the young when performing a repetitive maximal dynamic task at a relative resistance (isotonic) but not an absolute velocity (isokinetic), corresponding to maximal power.
机译：人们对动态任务中与年龄相关的疲劳的不同发现相关的潜在因素尚不十分清楚。这里的目的是研究与年龄相关的可疲劳性和反复约束（等速）和非约束速度（等渗）任务之间的恢复，其中参与者以最大功率对应的速度（等速）或阻力（等渗）进行疲劳收缩。为了在任务之间进行比较，在疲劳任务之前和之后以及短期恢复期间构造了等张扭矩-功率关系。在三个测试阶段中，记录了9位老年（〜75岁）和11位年轻（〜25岁）男性的收缩力。在第一阶段，评估最大功率，第2和第3阶段执行等速或等渗同心疲劳任务，直到最大功率降低40％。与年轻人相比，老年男性在等速运动中完成相同的收缩次数（〜45次收缩），但等渗任务执行次数减少20％（p <0.05）。无论年龄和任务如何，任务失败后立即将最大自愿等距收缩强度，角速度和功率分别降低约30％，约13％和约25％，并且仅等距扭矩在10分钟后无法完全恢复。总之，在相对阻力（等渗）而不是绝对速度（等速）（相当于最大力量）下执行重复的最大动态任务时，老年男人比年轻男人更具疲劳性。

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