Key result
Hypoxic exercise at 80 r.p.m. resulted in an MSNA burst frequency of 39 bursts/min, which did not differ from the 60 r.p.m. trial (39 bursts/min), attenuating cardiopulmonary baroreflex control.
Why the study?
Does increased central blood volume (via higher pedal cadence) suppress muscle sympathetic nerve activity during mild dynamic leg exercise in hypoxic conditions?
Population
Human subjects (sample size and demographics not stated in abstract)
Comparison
Leg cycling exercise in hypoxic conditions at 80… vs Leg cycling exercise in hypoxic conditions at 60…
Authors
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Higher cadence does not suppress MSNA in hypoxic exercise; leaves open cardiopulmonary baroreflex modulation by central blood volume.
Does increased central blood volume (via higher pedal cadence) suppress muscle sympathetic nerve activity during mild dynamic leg exercise in hypoxic conditions?
Absolute Event Rate: 39% vs 39%
Hypoxia-induced heightened sympathetic nerve activity during dynamic exercise attenuates cardiopulmonary baroreflex control of sympathetic vasomotor outflow.
Katayama et al. (2016) studied this question. Hypoxic exercise at 80 r.p.m. pedal cadence vs. Hypoxic exercise at 60 r.p.m. pedal cadence was evaluated on Muscle sympathetic nerve activity (MSNA) burst frequency. Hypoxic exercise at 80 r.p.m. resulted in an MSNA burst frequency of 39 bursts/min, which did not differ from the 60 r.p.m. trial (39 bursts/min), attenuating cardiopulmonary baroreflex control.
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