Key result
Left-lateral tilting to 45° during semi-supine cycling at a fixed power output significantly increased oxygen uptake and heart rate compared to semi-supine cycling without a tilt.
Why the study?
To evaluate cardiorespiratory responses to semi-supine exercise with versus without left-lateral tilting at fixed power output and matched heart rates.
Does left-lateral tilting during semi-supine cycling alter cardiorespiratory responses compared to upright or non-tilted semi-supine cycling in healthy adults?
Does left-lateral tilting during semi-supine cycling alter cardiorespiratory responses compared to upright or non-tilted semi-supine cycling in healthy adults?
Absolute Event Rate: 18.1% vs 15%
p-value: p=<0.05
Left-lateral tilting during semi-supine exercise significantly alters cardiorespiratory responses, indicating that physiological responses are not replicated between different tilt positions during stress echocardiography.
May affect cardiopulmonary exercise test interpretation; leaves open standardization of tilt in protocols and outcome studies.
We investigated the cardiorespiratory responses to semi-supine exercise with (SS+45°) and without (SS-0°) a left-lateral tilt in 15 adults at fixed power output (70 W) and matched heart rates. At 70 W, oxygen uptake and heart rate reduced from upright to SS-0° then increased to SS+45° (p < 0.05). At matched heart rates, oxygen uptake and efficiency were lowest in SS+45° (p < 0.05). Left-lateral tilting should not be performed under the assumption that each position replicates the same cardiorespiratory responses. Novelty: Cardiorespiratory responses to exercise are influenced by left-lateral tilting, which should not be performed under the assumption that physiological responses are replicated between left-lateral positions.
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Beaumont et al. (2020) studied Healthy adults (n=15). Semi-supine cycling with a 45° left-lateral tilt (SS-45°) vs. Upright cycling and semi-supine cycling without tilt (SS-0°) was evaluated on Oxygen uptake (VO2) at fixed power output (70W) (p=<0.05). Left-lateral tilting to 45° during semi-supine cycling at a fixed power output significantly increased oxygen uptake and heart rate compared to semi-supine cycling without a tilt.
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