Journal of Applied Physiology
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J Appl Physiol (January 24, 2003). doi:10.1152/japplphysiol.00895.2002
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Submitted on September 30, 2002
Accepted on January 17, 2003

Interaction between muscle metaboreflex and mechanoreflex modulation of arterial baroreflex sensitivity in human exercise

Charlotte A Carrington1*, Chulee Ubolsakka1, and Michael J White1

1 School of Sport and Exercise Sciences, University of Birmingham, Birmingham, West Midlands, United Kingdom

* To whom correspondence should be addressed. E-mail: C.A.Carrington{at}bham.ac.uk.

The effect of external calf compression on BRS during electrically evoked plantar flexion and post exercise circulatory occlusion (PECO) was studied. Subjects took part in two experimental trials: control and compression. In both trials electrically evoked isometric plantarflexion (STIM) was performed, at 30% maximum voluntary contraction force, for 2 min. During compression a cuff (inflated to 250 mmHg) was applied to the active calf during exercise and PECO. Sequence analysis carried out on the systolic blood pressure (SBP) responses and R-R intervals revealed a rightward shift of the regression line along the pressure axis during STIM in both trials. In the control experiment, BRS was significantly (p < 0.01) increased from 10.37 ± 1.87 ms.mmHg during STIM to 12.79 ± 1.62 ms.mmHg during PECO. With external compression, BRS was unaltered between STIM (10.84 ± 1.86 ms.mmHg) and PECO (11.40 ± 1.54 ms.mmHg). Since the metabolic conditions were the same in both experiments, the results may best be explained by reactivation of muscle mechanoreceptor activity by external compression during PECO.




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