The Dosage of Exercise Intensity According to the Exertion Perceived by Female Patients with Myocardial Infarction
With coronary patients the dosage of exercise is often decided in accordance with the perceived exertion. Local changes in the muscles involved during exercise and central changes in the cardiac and pulmonal system are responsible for the subjective perception of the exertion (Carton et al. 1985; Demello et al. 1987; Mihevic 1981; Robertson 1982). These two factors yield the subjectively experienced overall exertion, which correlates with the metabolic and cardiorespiratory variables lactate, V02, ventilation, and heart rate. According to experimental studies, the subjective perception of exertion to be “somewhat hard” (item 13 in the BORG Scale; Table 1) corresponds to an objective intensity of exercise exertion of the limited anaerobic threshold of 4 mmol/1 lactate (Demello et al. 1987; Dressenhofer et al. 1981), to 75% of the maximum symptom-limited heart rate, and to 70% of the maximum symptom-limited V02 (Gutmann et al. 1981). These correlations are independent of sex (Stephenson et al. 1982), age (Demello et al. 1987), and problems associated with angina pectoris or orthopedic troubles (Noble 1982). Viewed from the perspective of exercise therapy, the following questions are raised: (1) how do female patients perceive exertion at different training intensities, and (2) how does the perceived exertion relate to the above-mentioned parameters. In addition, the question of whether the perception of exertion can be safely and accurately utilized to determine the dosage of cardiological exercise therapy must also be examined.
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