Key result
Autonomic blockade with atropine and double blockade dramatically decreased total power of heart rate variability at rest and during exercise, supporting vagal withdrawal at exercise onset.
Why the study?
Does autonomic blockade alter heart rate variability during light exercise compared to rest in healthy men?
Population
7 men, mean age 24 (SD 3) years
Comparison
5-min cycling supine under autonomic blockade vs Control condition (no blockade) and 5-min rest
Design
Other
Authors
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May explain HRV loss during light exercise via vagal withdrawal; hypothesis-generating for autonomic modulation in exercise settings.
Does autonomic blockade alter heart rate variability during light exercise compared to rest in healthy men?
This study demonstrates that suppression of vagal activity is responsible for the disappearance of spontaneous heart rate variability during light exercise.
Fontolliet et al. (2018) studied this question. Autonomic blockade (atropine, metoprolol, and double blockade) vs. Control was evaluated on Total power (PTOT) of heart rate variability. Autonomic blockade with atropine and double blockade dramatically decreased total power of heart rate variability at rest and during exercise, supporting vagal withdrawal at exercise onset.
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