Phase-dependent heartbeat modulation by muscle contractions during dynamic handgrip in humans.

@article{Niizeki1999PhasedependentHM,
  title={Phase-dependent heartbeat modulation by muscle contractions during dynamic handgrip in humans.},
  author={Kyuichi Niizeki and Yoshimi Miyamoto},
  journal={American journal of physiology. Heart and circulatory physiology},
  year={1999},
  volume={276 4},
  pages={H1331-H1338}
}
The influence of cardiac phase on the response of the cardiac pacemaker to dynamic hand contraction in eight healthy young men was studied to determine whether heart rate response to muscle contraction varied as a function of timing within the cardiac cycle. Changes in R-R interval (RRI) in response to muscle contraction were measured at various cardiac phases during heartbeat-synchronized handgrip at a rate of one contraction per two heartbeats. To extract the direct effect of the muscle… CONTINUE READING
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