What question did this study set out to answer?

To determine how habitual exercise training posture influences cardiovascular dynamics and baroreflex function during orthostatic challenge.

June 1, 1995Canadian Journal of Applied Physiology

Cardiovascular Response to Orthostatic Stress: Effects of Exercise Training Modality

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Why the study?

Does exercise training posture affect cardiovascular and baroreflex responses to orthostatic challenge in men?

Population

Highly trained cyclists (n=8), highly trained swimmers (n=8), and untrained men (n=8)

Comparison

Upright exercise training (cyclists) vs Supine exercise training and no training

Design

Cross-sectional

Authors

GSGabrielle K. SavardUniversity of Copenhagen MSMark A. Stonehouse

Discussion

Member takes

Implication

Hypothesis-generating for posture-specific effects on orthostatic tolerance; leaves open causal baroreflex adaptations in athletes.

Key Points

To determine how habitual exercise training posture influences cardiovascular dynamics and baroreflex function during orthostatic challenge.
Evaluated cardiovascular responses to graded lower body negative pressure (LBNP, 0 to -50 mmHg) in 8 cyclists, 8 swimmers, and 8 untrained men (N=24).
Monitored stroke volume, pulse pressure, systemic vascular resistance, and peripheral vascular baroreflex function slopes (delta SVR/delta Zo and delta SVR/delta SV).
Cyclists exhibited the lowest orthostatic tolerance, with only 3 of 8 cyclists completing the full LBNP protocol compared to 5 of 8 untrained men and 8 of 8 swimmers.
Cyclists exhibited significantly reduced systemic vascular resistance and pulse pressure at high LBNP levels alongside attenuated delta SVR/delta Zo and delta SVR/delta SV slopes compared to swimmers and untrained controls, with no differences observed in heart rate responses.

Structured PICO

Does exercise training posture affect cardiovascular and baroreflex responses to orthostatic challenge in men?

Population

Highly trained cyclists (n=8), highly trained swimmers (n=8), and untrained men (n=8)

Intervention

Upright exercise training (cyclists)

Comparator

Supine exercise training (swimmers) and no training (untrained men)

Outcome

Cardiovascular and baroreflex responses to orthostatic challenge (lower body negative pressure, LBNP, 0 to -50 mmHg)surrogate

Upright-trained athletes (cyclists) have lower orthostatic tolerance during passive LBNP compared to supine-trained athletes (swimmers) and untrained individuals, due to attenuated baroreflex control.

Cite This Study

Savard et al. (1995) studied this question.

synapsesocial.com/papers/6a7d8ab77bc3bc4145999ea4 https://doi.org/10.1139/h95-018

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Cardiovascular Response to Orthostatic Stress: Effects of Exercise Training Modality

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Cardiovascular Response to Orthostatic Stress: Effects of Exercise Training Modality

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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Also Consider