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• W3180416445 abstract "Examining peak torque (PT) relative to muscle size provides insight on qualitative factors (e.g., fiber type composition, muscle activation) that are influential for maximal strength, yet data is scarcer for higher velocity contractions. Contractile acceleration (ACC) has been proposed to be influenced by similar physiological factors. PURPOSE: To examine absolute and relative PT, as well as ACC at different velocities in young and older males. METHODS: Healthy, young (n = 15, age = 20.7 ± 2.2 yrs) and older (n = 15, age = 71.6 ± 3.9 yrs) males performed maximal voluntary contractions at 0 deg/sec (isometric), 60 deg/sec, and 180 deg/sec using a dynamometer. Ultrasonography was used to obtain cross-sectional area (CSA) of the vastus lateralis and rectus femoris. Panoramic images were taken by the same investigator after participants rested in the supine position for ten minutes. PT was obtained at all velocities, and ACC was recorded as the highest 20 ms rolling average of the slope for the velocity-time curve at 60 deg/sec and 180 deg/sec prior to the load range phase. Relative PT for each velocity was calculated by dividing PT by CSA. Independent samples t-tests were used for group comparisons, while Pearson correlation coefficients were calculated for select variables. RESULTS: CSA was lower in older males (19%, p = 0.001). Absolute PT was decreased at all velocities (27-38%, p < 0.001), while relative PT (22%, p = 0.003) and ACC (11%, p = 0.004) were decreased only at 180 deg/sec in older males. ACC was only correlated with CSA in older males (r = 0.59, p = 0.02). CONCLUSIONS: The smaller CSA in older males was less influential for PT at 180 deg/sec, thus indicating the importance of other physiological factors for high-velocity strength. A higher contraction velocity was needed to reveal age-related differences for ACC, which is likely due to the greater duration of velocity development. Interestingly, ACC was moderately associated with CSA, but not relative PT, which suggests ACC and relative PT may not reflect similar physiological properties in older males." @default.
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• W3180416445 date "2021-08-01" @default.
• W3180416445 modified "2023-09-27" @default.
• W3180416445 title "Age-Related Differences In Absolute And Relative Maximal Strength At Different Velocities" @default.
• W3180416445 doi "https://doi.org/10.1249/01.mss.0000760628.59721.0a" @default.
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