Strength Training Methods Does Not Affect Post-Exercise Hypotension and Heart Rate Variability

摘要

The purpose of this study was to determine the influence of resistance exercise (RE) training methods (circuit [C], multiple sets [MS]) on post-exercise hypotension (PEH) and heart rate variability (HRV) of untrained normotensive adults. The subjects (N = 25; 46.5 ± 4.9 yrs; mean arterial pressure [MAP] 96.4 ± 4.0 mmHg; resting heart rate [HR] 66.5 ± 4.7 beats?min-1 ) performed C and MS sessions (12 exercises 3 sets; 14 to 17 reps; 60% of 1RM) with equal total work load. Their blood pressure (BP) and HRV were monitored 20 min before and 90 min after the RE sessions. Autonomic regulation was evaluated by normalized low-frequency (LFnu) and high-frequency (HFnu) components of HRV. The MAP remained significantly reduced throughout the post-exercise period compared to rest for both RE sessions (C = -6.1 ± 1.3 mmHg and MS = -6.3 ± 1.5 mmHg; P<0.05), but was not significantly different between C and MS. The LFnu increased while the HFnu decreased following both RE sessions (P<0.05). Thus, both methods caused a similar PEH response. The HFnu increase suggests that PEH is accompanied by increased sympathetic modulation of the heart, which has been previously described for the MS but not for C. This study indicates that PEH is not affected by exercise method, and is determined by central nervous system changes. The cardiovascular response is likely associated with other mechanisms, such as plasma blood volume.