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Blood volume contributes to the mechanical synchrony of the myocardium during moderate and high intensity exercise in women

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Abstract

Purpose

Whether blood volume (BV) primarily determines the synchronous nature of the myocardium remains unknown. This study determined the impact of standard blood withdrawal on left ventricular mechanical dyssynchrony (LVMD) in women.

Methods

Transthoracic speckle-tracking echocardiography and central hemodynamic measurements were performed at rest and during moderate- to high-intensity exercise in healthy women (n = 24, age = 53.6 ± 16.3 year). LVMD was determined via the time to peak standard deviation (TPSD) of longitudinal and transverse strain and strain rates (LSR, TSR). Measurements were repeated within a week period immediately after a 10% reduction of BV.

Results

With intact BV, all individuals presented cardiac structure and function variables within normative values of the study population. Blood withdrawal decreased BV (5.3 ± 0.7 L) by 0.5 ± 0.1 L. Resting left ventricular (LV) end-diastolic volume (− 8%, P = 0.040) and passive filling (− 16%, P = 0.001) were reduced after blood withdrawal. No effect of blood withdrawal was observed for any measure of LVMD at rest (P ≥ 0.225). During exercise at a fixed submaximal workload (100 W), LVMD of myocardial longitudinal strain (LS TPSD) was increased after blood withdrawal (36%, P = 0.047). At peak effort, blood withdrawal led to increased LVMD of myocardial transverse strain rate (TSR TPSD) (31%, P = 0.002). The effect of blood withdrawal on TSR TPSD at peak effort was associated with LV concentric remodeling (r = 0.59, P = 0.003).

Conclusion

Marked impairments in the mechanical synchrony of the myocardium are elicited by moderate blood withdrawal in healthy women during moderate and high intensity exercise.

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Data availability

All data relevant to this study are presented in the manuscript.

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Acknowledgements

The authors thank the study participants for their willingness, time and effort devoted to this study.

Funding

This work was funded by the Swiss National Science Foundation (P2ZHP3-184211, to C.D.) and the Natural Sciences and Engineering Research Council of Canada (Discovery Grant, RGPIN-2019-04833, to D.M.).

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Authors and Affiliations

Authors

Contributions

Conception and Design of experiments: CD, DM. Collection, analysis and interpretation: JK, CD, KYC, MG, DM. Drafting the article or revising it critically for important intellectual content: JK, CD, KYC, MG, DM.

Corresponding author

Correspondence to David Montero.

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Conflict of interest

The authors declare no conflict of interest.

Ethical approval

The study was approved by the Conjoint Health Research Ethics Board (REB18-1654) of the University of Calgary and conducted in accordance with the declaration of Helsinki. All participants provided informed oral and written consents before starting the measurements.

Additional information

Communicated by Westerterp/Westerblad .

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Khor, J., Diaz-Canestro, C., Chan, K.Y. et al. Blood volume contributes to the mechanical synchrony of the myocardium during moderate and high intensity exercise in women. Eur J Appl Physiol 124, 1227–1237 (2024). https://doi.org/10.1007/s00421-023-05355-5

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  • DOI: https://doi.org/10.1007/s00421-023-05355-5

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