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Influence of breathing on variation in cardiac stroke volume at the onset of cycling

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Abstract

Purpose

During cycling, the variation in cardiac stroke volume (SVV) is similar to that at rest. However, SVV may be influenced by ventilation at the start of cycling, e.g., by a Valsalva-like maneuver used to stabilize the body. This study evaluated the influence of ventilation on SV during initiation of cycling.

Methods

Ten healthy recreationally physical active males (mean ± SD: age 26 ± 3 years, height 184 ± 9 cm, weight 85 ± 9 kg) cycled on an ergometer for four 30 s intervals at submaximal workloads while synchronizing ventilatory and cardiovascular variables derived from gas exchange and arterial pulse contour analysis, respectively.

Results

At exercise onset, cardiac output increased by an instantaneous rise in heart rate and SV (P < 0.05). In contrast, blood pressure increased only after 15 s (P < 0.05), reflected in a decline in total peripheral resistance from exercise onset (P < 0.05). SVV was similar at rest (20 ± 6%) and during exercise (21 ± 5%) except for the first 5 s of exercise when a ~ 2.5-fold elevation (47 ± 6%; P < 0.05) was correlated to variation in respiratory frequency (= 0.71, P = 0.02) and tidal volume (R = 0.66, P = 0.04) but not to variation in heart rate or blood pressure. Stepwise multiple regression analysis indicated a respiratory frequency influence on SVV at the onset of ergometer cycling.

Conclusion

The data provide evidence for a ventilatory influence on SVV at the onset of cycling exercise.

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Acknowledgements

The authors thank Stefanos Voliniatis for constructive suggestions to the manuscript and Till Christiansen for assistance during the study.

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Authors and Affiliations

Authors

Contributions

CS and NHS conceived and designed the research. CS and MPR performed the experiments. CS analyzed the data. CS and NHS interpreted the results of experiments. CS and NHS drafted the manuscript with all the authors involved in the revision and approval of the final version of the manuscript.

Corresponding author

Correspondence to Casper Sejersen.

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Conflict of interest

The authors declare no conflict of interest.

Additional information

Communicated by Ellen Adele Dawson.

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Sejersen, C., Rocha, M.P., Van Lieshout, J.J. et al. Influence of breathing on variation in cardiac stroke volume at the onset of cycling. Eur J Appl Physiol 121, 3061–3067 (2021). https://doi.org/10.1007/s00421-021-04772-8

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  • DOI: https://doi.org/10.1007/s00421-021-04772-8

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