Myocardial oxygen increases due to physical training in individuals with coronary heart disease (CHD): Rate pressure product (RPP) measurements
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Endurance training is used to restore, as much as possible, the functional capabilities of individuals with coronary heart disease (CHD) during phase II of the cardiac rehabilitation program. The functional capabilities of individuals with CHD are a function of the capacity of their cardiovascular system which, in turn, is dependent upon the supply of oxygen to cardiac muscles. The greater the supply of oxygen to cardiac muscles (measured by peak myocardial oxygen consumption, MVO2max), the greater the ability of the circulatory system to meet the demands placed upon it. Rate pressure product (RPP; heart rate × systolic blood pressure) is an easy, reliable, and indirect measure of MVo2max. Therefore, contemporary cardiac rehabilitation programs should focus on enhancing RPPmax. Utilizing data from 210 individuals with CHD, a statistically significant pre-post conditioning effect in RPPmax was observed (p<0.01). In the absence of a control group, it was not possible to attribute increases in RPPmax to endurance training. This study also found no significant differences in RPPmax values among the three cardiac conditions investigated (bypass, angioplasty, and post-MI;p≥0.10). However, there were significant differences between the RPPmax values of men and women (p<0.01). The gender differences in RPPmax values disappeared when the data were normalized with respect to pretraining RPP values. Since a severe decline in MVo2max leads to most heart problems, it is suggested that future studies document the effect of endurance training on enhancing RPPmax. If such a relationship is established, then cardiac rehabilitation training programs should focus on enhancing MVo2max, by way of enhancing RPPmax. Such a focus is likely to result in a greater functional capability (ability to perform work). The discussion indicates how the design of jobs and assignment of individuals (both individuals with CHD and healthy people) to various jobs can be based on RPPmax rather than Vo2max, and how it can provide an objective basis for designing less stressful jobs from a psychological and physical demands perspective.
Key wordsendurance training coronary heart disease (CHD) cardiac muscles rate presure product (RPP)
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