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• W2328355364 abstract "Purpose Above a given exercise intensity, rapid muscle fatigue will occur. We explored the possibility of assessing torque threshold for peripheral fatigue during single-legged repetitive isometric knee extensor exercise. We hypothesized this fatigue threshold to be related to the general aerobic fitness level and the so-called “critical torque” (CT) established with a recently validated 5-min all-out test. Methods Seventeen healthy men (V˙O2max = 44.7–69.6 mL·kg−1·min−1) performed six submaximal (20%–55% maximal voluntary contraction [MVC]) 5-min bouts of 60 repetitive contractions (3-s on, 2-s off). Torque was changed between bouts in steps of 5% MVC to estimate the highest intensity (fatigue threshold) at which average changes in rsEMG, EMG median power frequency, and tissue deoxygenation (near-infrared spectroscopy) of the three superficial knee extensor muscles were still <5%, signifying steady-state exercise with minimal peripheral fatigue. On another occasion, one bout was performed in an all-out manner with end-test torque representing CT. Results Fatigue threshold (40.0% ± 8.1% MVC) was related (r2 = 0.57, P < 0.05) to CT (53.1% ± 10.0% MVC), but it was consistently lower (P < 0.05) and only fatigue threshold was significantly related to V˙O2max (r2 = 0.68), and the first (r2 = 0.45) and second (r2 = 0.63) ventilatory threshold obtained during cycle ergometry. Conclusions Performing submaximal bouts of knee extensor contractions, while monitoring EMG and deoxygenation, seems a feasible manner to estimate an aerobic capacity–related exercise intensity of peripheral fatigue onset. This test may be used to evaluate changes in endurance capacity of single muscle groups, without the necessity for all-out testing, which could be problematic with frail subjects." @default.
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• W2328355364 date "2012-07-01" @default.
• W2328355364 modified "2023-10-06" @default.
• W2328355364 title "Knee Extensor Fatigue Threshold Is Related to Whole-Body V˙O2max" @default.
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• W2328355364 doi "https://doi.org/10.1249/mss.0b013e318249d701" @default.
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