Continuous blood pressure response at different intensities in leg press exercise

Background Generally, the evaluation of the blood pressure response to resistance exercise has been limited to the evaluation of discontinuous casual blood pressure monitoring, often measured at the end of the exercise. Design To continuously evaluate the blood pressure response at different intensities of leg press exercise with the same duration and number of repetitions. Methods Seven normotensive healthy men performed an incremental test on the leg press machine at relative intensities of one repetition maximum (1RM). The blood pressure and heart rate were measured simultaneously to the incremental exercise by a photoplethysmographic method. Results The meanSD peak values of the heart rate, diastolic blood pressure (DBP) and systolic blood pressure (SBP) were obtained on 70% of 1RM and were 145 +/- 20 bpm, 113.1 +/- 15.4mmHg, and 192.4 +/- 20.0mmHg, respectively. The SBP was characterized by a decrease followed by an increase during the sets of exercise. The decrease in the SBP was 12-22mmHg and took approximately 25seconds to reach the minimum value before the increase. It was observed for all participants in most of the intensities. The rate of increase in the SBP was not statistically different between the intensities. Conclusions Both duration and intensity of exercise have an impact on the blood pressure response. Above 30% of 1RM, the SBP decreases in approximately 20seconds and starts to increase until the end of the set of leg press exercise.