Key result
Steady-state dynamic exercise significantly increased MSNA burst frequency from 16 to 36 bursts/min (P<0.05), with a continuous resetting of arterial baroreflex control without changes in sensitivity.
Population
8 human subjects, mean age 25 +/- 1 years
Comparison
Arm cycling at 50% peak oxygen uptake (VO2peak) vs Rest and unloaded arm cycling
Design
Other
Authors
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May refine models of sympathetic activation during exercise; leaves open applicability to cardiovascular disease states.
Observational (n=8)
Absolute Event Rate: 36% vs 16%
p-value: p=<0.05
Arterial baroreflex control of muscle sympathetic nerve activity is continuously reset to operate around exercise-induced elevations in blood pressure without changes in reflex sensitivity.
Ogoh et al. (2007) reported an observational. Steady-state dynamic exercise (arm cycling at 50% VO2peak) vs. Rest and unloaded arm cycling was evaluated on Muscle sympathetic nerve activity (MSNA) burst frequency (p=<0.05). Steady-state dynamic exercise significantly increased MSNA burst frequency from 16 to 36 bursts/min (P<0.05), with a continuous resetting of arterial baroreflex control without changes in sensitivity.
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