Key result
Electrically evoked and voluntary isometric contractions at 30% of maximal contraction produced similar initial increases in heart rate and blood pressure, suggesting central command is not necessary.
Why the study?
Does central command mediate the initial increases in heart rate and blood pressure during isometric contraction?
Population
9 healthy subjects
Comparison
Electrically evoked isometric contractions of… vs Voluntary isometric contractions of the triceps…
Follow-up
4 minutes
Authors
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May not require central command for initial responses; leaves open its role in clinical or dynamic exercise settings.
Does central command mediate the initial increases in heart rate and blood pressure during isometric contraction?
The initial increases in heart rate and blood pressure during isometric contraction do not require central command, and maintained blood pressure elevation during circulatory occlusion is likely due to trapped chemical substances.
Bull et al. (1989) studied Healthy subjects (n=9). Electrically evoked isometric contractions vs. Voluntary isometric contractions was evaluated on Changes in heart rate and blood pressure. Electrically evoked and voluntary isometric contractions at 30% of maximal contraction produced similar initial increases in heart rate and blood pressure, suggesting central command is not necessary.
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