Reduction of Stroke Volume and Increase in Heart Rate after a Previous Heavier Submaximal Work Load
Why the study?
Does a previous heavier submaximal work load alter heart rate and stroke volume during subsequent lighter work?
Population
8 middle-aged sedentary males and a cross-sectional cohort of 69 individuals with max V˙o2 from 30 to 62…
Comparison
Short duration work loads at about 40% of… vs The same short duration work loads without a…
Design
Cross-sectional
Authors
Discussion
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Implication
Sequential testing may confound HR/SV interpretation; leaves open training effects on post-exercise hemodynamics.
Structured PICO
Does a previous heavier submaximal work load alter heart rate and stroke volume during subsequent lighter work?
P
Population
8 middle-aged sedentary males and a cross-sectional cohort of 69 individuals with max V˙o2 from 30 to 62 ml/kgxmin
I
Intervention
Short duration work loads at about 40% of maximal oxygen uptake (max V˙o2) performed 10 min after a heavier work load demanding about 75% of max V˙o2
C
Comparator
The same short duration work loads without a prior heavier work load, and comparisons between trained and untrained states
O
Outcome
Changes in heart rate, cardiac output, and stroke volumesurrogate
Prior heavy submaximal exercise increases heart rate and decreases stroke volume during subsequent lighter exercise, an effect that is attenuated by physical training.
Cite This Study
Hartley et al. (1968) studied this question.