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Moderate intensity supine exercise causes decreased cardiac volumes and increased outer volume variations - a cardiac magnetic resonance imaging study
Journal of Cardiovascular Magnetic Resonance volume 16, Article number: P38 (2014)
The effects on left and right ventricular (LV, RV) volumes during physical exercise remains controversial. Furthermore, no previous study has investigated the effects of exercise on longitudinal contribution to stroke volume (SV) and the outer volume variation of the heart. The aim of this study was to determine if LV, RV and total heart volumes (THV) as well as cardiac pumping mechanisms change during physical exercise compared to rest using cardiac magnetic resonance imaging (CMR).
26 healthy volunteers (6 women) underwent cine CMR at rest and exercise. Exercise was performed using a custom built ergometer for one-legged exercise in the supine position during breath hold imaging. Cardiac volumes and atrio-ventricular plane displacement were determined. Heart rate (HR) was obtained from ECG.
HR increased during exercise (60 ± 2 to 94 ± 2 bpm, p < 0.001). LVEDV remained unchanged (p = 0.81) and LVESV decreased with -9 ± 18% (p < 0.05) causing LVSV to increase with 8 ± 3% (p < 0.05) (Figure 1A-C). RVEDV and RVESV decreased (-7 ± 10% and -24 ± 14% respectively, p < 0.001) and RVSV was increased with 5 ± 17% although not statistically significant (p = 0.18) (Figure 1 D-F). Longitudinal contribution to RVSV decreased during exercise (-6 ± 15%, p < 0.05) but was unchanged for LVSV (p = 0.74). THV decreased during exercise (-4 ± 1%, p < 0.01) and total heart volume variation (THVV) increased during exercise from 5.9 ± 0.5% to 9.7 ± 0.6%, p < 0.001) (Figure 2).
Cardiac volumes and function are significantly altered during supine physical exercise. THV becomes significantly smaller due to decreases in RVEDV whilst LVEDV remains unchanged. THVV and consequently radial pumping increases during exercise which may improve diastolic suction during the rapid filling phase.
This study was funded by the Swedish Research Council, the Swedish Heart and Lung Foundation, Region of Scania, the Medical Faculty at Lund University, Sweden, the Swedish Heart Association and Novo Nordisk Foundation, Denmark.
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Steding-Ehrenborg, K., Jablonowski, R., Arvidsson, P.M. et al. Moderate intensity supine exercise causes decreased cardiac volumes and increased outer volume variations - a cardiac magnetic resonance imaging study. J Cardiovasc Magn Reson 16 (Suppl 1), P38 (2014). https://doi.org/10.1186/1532-429X-16-S1-P38
- Physical Exercise
- Cardiac Magnetic Resonance
- Cardiac Magnetic Resonance Imaging
- Swedish Research Council
- Cardiac Volume