Key result
Isometric exercise performed for 45 seconds with one half of maximum resistance stimulated heart rate to the same extent as isotonic exercise of the same intensity and duration.
Why the study?
Does isometric exercise affect heart rate differently than isotonic exercise?
Does isometric exercise affect heart rate differently than isotonic exercise?
Isometric and isotonic exercises of the same intensity and duration elicit similar heart rate responses, with isometric heart rate increasing proportionally to the load.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating for isometric loading in HR response; larger trials needed before any training implications.
Twelve subjects were used to determine the effect of isotonic and isometric exercises on heart rate using a military press in a sitting position. The isotonic exercise was performed for 45 sec. with one half of maximum resistance, and the isometric exercises were performed for 45 sec, with one half, two thirds, and maximum resistance. The results indicated that isometric exercise performed for 45 sec. with one half of maximum resistance could stimulate heart rate to the same extent that isotonic exercise could, using the same intensity and duration. The results also showed that increasing the load in isometric contraction resulted in a proportional increase in heart rate and that increasing the load to maximum isometric contraction resulted in a near twofold increase in heart rate.
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E Shvartz (1966) studied this question. Isometric exercise vs. Isotonic exercise (45 sec with one half of maximum resistance) was evaluated on Heart rate. Isometric exercise performed for 45 seconds with one half of maximum resistance stimulated heart rate to the same extent as isotonic exercise of the same intensity and duration.
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