Abstract
Objectives
To establish the effect of intensity of effort during Valsalva’s manoeuvre (VM) on blood pressure and heart rate responses.
Methods
Fourteen participants consisting of eight powerlifters and six controls completed four 15-s VMs at 30 and 50% maximum expiratory pressure. Expiratory pressure (EP), systolic blood pressure (SBP), diastolic blood pressure (DBP) and heart rate (HR) were recorded continuously during manoeuvres and response amplitudes were related to well-established phases (I–IV).
Results
For all participants, SBP and DBP responses during Phase I were significantly higher at 50% EPmax than 30% EPmax. Phase II responses were significantly higher at 50% EPmax than 30% EPmax for HR (39.9 ± 24.3 vs. 24.5 ± 12.5 bpm), SBP (43.6 ± 24.6 vs. 35.3 ± 18.3 mm Hg) and DBP (26.7 ± 7.1 vs. 21.1 ± 7.4 mm Hg). For Phase IV, only the HR response was affected significantly by intensity. These intensity-dependent effects were similar between powerlifters and controls. Powerlifters had significantly greater Phase II responses (HR, SBP and DBP), but in the whole group these cardiovascular responses were also significantly correlated with expiratory pressure (mm Hg) at 30% EPmax (r=0.59–0.84) and 50% EPmax (r=0.53–0.82) which was higher in powerlifters than controls.
Conclusions
This study demonstrates that heart rate and blood pressure responses during Phase II are affected by the relative intensity of VM, whereas during Phase IV only heart rate is affected. The higher Phase II responses in powerlifters can be attributed to the higher expiratory pressures they developed.
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Research funding: None declared.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: Authors state no conflict of interest.
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Informed consent: Informed consent was obtained from all individuals included in this study.
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Ethical approval: The local Institutional Review Board (Western Sydney University Human Research Ethics Committee) approved this study before it began (approval #H13361, 19/08/2019).
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/jbcpp-2022-0029).
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