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- W2012157274 abstract "Previous studies from our laboratory have demonstrated that altering muscle temperature of the exercising forearm can elicit changes in muscle sympathetic nerve activity (MSNA) during ischemic isometric handgrip. The purpose of the current study was to determine the interactive effect of muscle temperature and blood flow on MSNA responses during dynamic handgrip (DHG). Eight subjects performed two bouts of graded DHG to fatigue followed by 2 min of postexercise muscle ischemia (PEMI). Local heating of the forearm increased muscle temperature from 33.6 ± 0.3 to 38.3 ± 0.5°C ( P < 0.05). Mean arterial pressure and heart rate increased in a linear fashion during graded DHG ( P < 0.05) but were not affected by muscle temperature. MSNA (burst frequency and total activity) at fatigue and PEMI were elevated in all conditions ( P < 0.05). However, MSNA responses were not different between temperature conditions. To ascertain the effect of blood flow, eight additional subjects completed two trials of ischemic DHG under control or warm conditions followed by 2 min of PEMI. MSNA, expressed as burst frequency and total activity, was significantly greater in warm compared with the control trial (Δ14 ± 3 and Δ9 ± 2 bursts/30 s, and Δ1,234 ± 260 and Δ751 ± 199 units/30 s, respectively). This finding supports the concept that muscle heating sensitizes skeletal muscle afferents during muscle contractions and augments MSNA in humans. However, on the basis of these findings, we conclude that muscle blood flow modulates the effect of muscle temperature on MSNA during exercise." @default.
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- W2012157274 date "2009-05-01" @default.
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- W2012157274 title "Modulation of muscle sympathetic nerve activity to muscle heating during dynamic exercise" @default.
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- W2012157274 doi "https://doi.org/10.1152/ajpregu.90823.2008" @default.
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