[Intercorrelations and variabilities of heart rate at the rest and during exercise in the evaluation of physical fitness].

It appears that heart rate measured at rest may significantly affect the values obtained during a sub-maximal effort: isometric as well as isotonic. For this study, 24 male subjects were tested, on a 15 and 30 days interval in a laboratory during an isometric effort. The task was to lift and hold with the arms bent, at a standardized angle of 45 degrees, a 12 kg load during a three minute period. The influence of the resting pulse on the isotonic submaximal values were studied on one subject during a period of 30 days. The authors thus suggest that the battery of tests which determine physical aptitude based on the sole criterion of heart rate as measured during a sub-maximal effort (Astrand's PWC-170, Step test, etc.) take into account the variability of the resting values of this parameter.