MAXIMUM ISOKINETIC ANKLE PLANTAR AND DORSAL FLEXION TORQUES IN TRAINED SUBJECTS
MAXIMUM ISOKINETIC ANKLE PLANTAR AND DORSAL FLEXION TORQUES IN TRAINED SUBJECTS
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DOI：
10.1007/bf02332967
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发表时间：
1981-01-01
影响因子：
3
通讯作者：
FUGLMEYER, AR
中科院分区：
文献类型：
--
作者：
FUGLMEYER, AR
Isokinetic male plantar- and dorsal-flexion torques, IPF and IDF, respectively, were measured in 25 physically healthy athletes, 15 males and 10 females, with simultaneous recording of rectified, linearly enveloped surface electromyograms [EMG] and peak EMG tensions (PEMG). Angular delays from the start of motion to occurrence of peak torques were also registered. Maneuvers were performed in 2 knee positions. For comparison of strength 30 non-athletic (untrained) controls were included. IPF, but not IDF, was greater in the trained than in the untrained subjects. Formulae for estimation of IPF at 30.degree. differ between trained and untrained subjects. Smaller gender differences in maximum strength for trained than for untrained subjects suggest that habitual rather than genetic dissimilarities cause sex differences in strength. Slope differences in the negative exponential models which characterize IPF and IDF as functions of increasing velocity of angular motion may be caused by different structural properties of ankle flexors and extensors. A lower PEMG of the musculus gastrocnemius in the flexed than in the extended knee positons can explain the lower IPF, suggesting that mechanical rather than supraspinal factors cause postural IPF differences. Greater IDF in the flexed than in the extended knee position may indicate that neurogenic mechanisms are involved.
