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- W4387061941 abstract "PURPOSE: To compare skeletal muscle oxygen uptake (mV̇O2) during work matched electrically stimulated (ES) and voluntary (VOL) plantarflexion contractions at various contraction frequencies and intensities. METHODS: Ten recreationally active men and women (27 ± 3.3 years; 171.7 ± 5.5 cm; 77.2 ± 12.6 kg) participated in this investigation. Participants sat in a chair with the right knee fully extended and right foot secured to a force transducer. A near-infrared spectroscopy (NIRS) device was placed at the largest circumference of the gastrocnemius with ES electrodes placed superior and inferior to the NIRS optode. Participants performed a series of ES and VOL plantarflexion contractions at frequencies of 1 Hz and 2 Hz. ES was administered for fifteen seconds at an electrical current of 30, 40, 50, 60, 70 and 80 amps in random order. Subsequently VOL contractions were performed at 1 and 2 Hz with real time force feedback enabling subjects to match forces produced during ES. Immediately following cessation of each set, a five second arterial occlusion was performed to measure mV̇O2. A maximal ischemic calibration was performed via a three-to-five-minute arterial occlusion. NIRS data was corrected for blood volume shifts. Paired samples t-tests with a Benjamini-Hochberg post-hoc analysis were performed to determine if there were significant differences in mV̇O2 between contraction frequencies and modality. RESULTS: ES resulted in a significantly greater mV̇O2 slope at 1 Hz (-0.08 ± 0.08 % mV̇O2/s/kg vs -0.002 ± 0.02 % mV̇O2/s/kg; p = 0.014) and 2 Hz (-0.11 ± 0.10 % mV̇O2/s/kg vs 0.001 ± 0.01 % mV̇O2/s/kg; p = 0.012), as well as a significantly greater mV̇O2 intercept at 2 Hz (-1.88 ± 1.43 % mV̇O2/s vs -0.69 ± 0.35 % mV̇O2/s; p = 0.035) but not 1 Hz (p = 0.535) when compared to VOL. 2 Hz resulted in a significantly greater mV̇O2 intercept when compared to 1 Hz during ES (-0.62 ± 0.46 % mV̇O2/s vs -1.88 ± 1.43 % mV̇O2/s; p = 0.011), but not VOL (p = 0.139). Additionally, there were no significant differences between 1 Hz and 2 Hz mV̇O2 slope for both ES (p = 0.361) and VOL (p = 0.614). CONCLUSION: These data indicate ES results in a significantly greater skeletal muscle oxygen consumption, when compared to VOL plantarflexion contractions at similar work rates. However, differences in fiber activation relative to optical pathlength must be considered." @default.
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- W4387061941 date "2023-09-01" @default.
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- W4387061941 title "Influence Of Electrical Stimulation And Voluntary Plantarflexion Contractions On Oxygen Uptake Using Near-Infrared Spectroscopy" @default.
- W4387061941 doi "https://doi.org/10.1249/01.mss.0000981696.03505.86" @default.
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