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• W2460460839 abstract "It is unclear why older adults are usually less fatigable during isometric tasks, but are more fatigable during fast isotonic-like dynamic tasks when compared with younger adults. Potentially important factors related to contractile performance differences between younger and older adults that have not been well-explored are rate of torque development (RTD) and rate of velocity development (RVD) during voluntary dynamic contractions. PURPOSE: To investigate age-related differences in fatigability during fast high-intensity dynamic plantar flexions and to assess whether there is a relationship between the expected greater age-related reduction in peak power and either RVD or RTD, or both. METHODS: Neuromuscular properties were recorded from 10 old (∼78 years) and 10 young (∼24 years) men prior to, during, and following fifty maximal-effort dynamic unconstrained velocity plantar flexions against a resistance equivalent to 20% of maximal voluntary isometric contraction torque. RESULTS: Peak power, peak angular velocity, and concentric torque decreased by 30.4 ± 13.2%, 19.7± 6.9%, and 13.6 ± 9.0%, respectively, for the young (p < 0.05), and 45.8 ± 8.8%, 27.0 ± 5.9%, 28.5 ± 15.1%, respectively, for the old (p < 0.05) by the end of the task. RVD and RTD decreased by 23.8 ± 11.6 % and 24.5 ± 10.5 % in the young, respectively, and 39.7 ± 7.9 % and 47.7 ± 13.6 % for the old, respectively. For all parameters reported above, decreases were greater in the old than young (p < 0.05). The reduction in peak power was strongly related to a reduction in RVD (R2 = 0.92, p < 0.05) and peak velocity (R2 = 0.83, p<0.05), but only a moderate relationship was found between a reduction in peak power and reductions in RTD (R2 = 0.69, p < 0.05) and torque (R2 = 0.52, p < 0.05). CONCLUSIONS: Compared with the young, the old men exhibited greater fatigability, characterized by a larger decline in peak power. This reduction in power was strongly associated with a reduction in RVD and peak velocity, but only moderately associated with the torque-dependent measures. Thus, RVD likely reflects key factors contributing to peak power loss when performing a repetitive dynamic fatigue task in older adults." @default.
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• W2460460839 date "2015-05-01" @default.
• W2460460839 modified "2023-09-27" @default.
• W2460460839 title "Greater Fatigability In Older Than Younger Men Is Related To The Rate Of Velocity Development" @default.
• W2460460839 doi "https://doi.org/10.1249/01.mss.0000476574.31415.e5" @default.
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