Why the study?
Does a 10-second isometric exercise affect heart rate, blood pressure, and net oxygen cost in human subjects?
Does a 10-second isometric exercise affect heart rate, blood pressure, and net oxygen cost in human subjects?
A brief 10-second isometric exercise causes transient increases in heart rate and systolic blood pressure that resolve within minutes.
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Short isometric exercise yields transient HR/BP rises; Level 5 data leaves open clinical relevance and oxygen variability.
A study was made on the effects of a 10-sec. isometric exercise, which involved much of the large musculature, upon the heart-rate, blood pressure, and net oxygen cost. Six subjects exercised in a semireclining, fixed position against a Medart spring dynamometer. Each subject pulled to 60 percent of his previously determined maximum effort. Heart rate showed a slight increase during exercise followed by a sharp rise in the few seconds following exercise. This was followed by a drop almost to the resting level within 20 to 30 sec. following exercise. Systolic pressure rose following exercise and was highest in the period immediately following exercise, then dropped slowly to resting levels within 2 1/2 min. Oxygen consumption varied widely both between subjects and between experiments in the same subject.
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Bartels et al. (1968) studied this question.
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