What question did this study set out to answer?

To determine whether aerobic fitness influences hemodynamic responses and baroreflex function in women undergoing progressive lower body negative pressure.

August 1, 1987Medicine & Science in Sports & Exercise

Physical fitness and hemodynamic response of women to lower body negative pressure

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Why the study?

Does aerobic fitness alter the hemodynamic and baroreflex response to lower body negative pressure in women?

Population

16 women (mean age 24.7 years), divided into trained (n=8) and untrained (n=8) based on VO2max.

Comparison

Progressive lower body negative pressure to -50… vs Untrained women compared to trained women, and…

Design

Cross-sectional

Authors

DHDonna L. HudsonSmall Business Administration MSMichael L. SmithUniversity of North Texas PRPeter B. RavenUniversity of North Texas

Discussion

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Implication

Aerobic fitness may not modulate women's LBNP responses; leaves open sex-specific baroreflex adaptations.

Key Points

To determine whether aerobic fitness influences hemodynamic responses and baroreflex function in women undergoing progressive lower body negative pressure.
Assessed 16 women (mean age 24.7 years) stratified by Bruce protocol VO2max testing into trained (N=8, mean VO2max = 56.8 ml O2·min⁻¹·kg⁻¹) and untrained (N=8, mean VO2max = 39.4 ml O2·min⁻¹·kg⁻¹) cohorts.
Measured heart rate, blood pressure, cardiac index, forearm blood flow, and leg circumference during progressive lower body negative pressure (LBNP) to -50 torr.
Hemodynamic responses showed no significant differences between trained and untrained women across LBNP stages (P > 0.05), except for significantly higher vascular resistance and diastolic blood pressure in untrained subjects at -50 torr.
Baroreflex responsiveness (delta heart rate / delta systolic blood pressure) remained similar between trained and untrained cohorts (P > 0.05), diverging from previously observed fitness-related blunting in men.
Women demonstrated significantly higher overall tolerance to -50 torr LBNP than a comparable historical cohort of males (P < 0.05), regardless of fitness status.

Structured PICO

Does aerobic fitness alter the hemodynamic and baroreflex response to lower body negative pressure in women?

Population

16 women (mean age 24.7 years), divided into trained (n=8) and untrained (n=8) based on VO2max.

Intervention

Progressive lower body negative pressure (LBNP) to -50 torr.

Comparator

Untrained women (mean VO2max 39.4) compared to trained women (mean VO2max 56.8), and comparison to a similar subject pool of males.

Outcome

Hemodynamic response (heart rate, blood pressure, cardiac index, forearm blood flow, leg circumference) and index of baroreflex responsiveness during LBNP.surrogate

Unlike in men, aerobic fitness does not appear to significantly attenuate baroreflex function or overall hemodynamic tolerance during lower body negative pressure in women.

Cite This Study

Hudson et al. (1987) studied this question.

synapsesocial.com/papers/6a6f2544e71d69abee07dfd6 https://doi.org/10.1249/00005768-198708000-00009

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Physical fitness and hemodynamic response of women to lower body negative pressure

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Physical fitness and hemodynamic response of women to lower body negative pressure

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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