Abstract 3541: Resistance Exercise Training Improves Heart Rate Recovery In Young Men
Introduction. Heart rate recovery (HRR) after exercise, an index of cardiac parasympathetic function, is associated with increased risk for arrhythmia and other cardiovascular morbidities and mortality. Although aerobic/endurance exercise training has been shown effective in improving HRR, little is known regarding the effects of resistance training (RT) on HRR. The purpose of this study was to test the hypothesis that RT would improve HRR.
Methods. Twenty-nine healthy young men (age 23.5 ± 0.7 yrs, body mass index 25.6 ± 0.9) completed a cross-over design consisting of a 4-week time control period followed by a 6-week RT intervention (3 days per week, total body regimen). HRR was calculated from a graded maximal exercise test as maximal heart rate attained during the test minus heart rate at 1-minute post exercise. Body fat was measured using air displacement plethysmograpy. Strength was assessed using a 1 repetition maximum (1RM) bench press. All measurements were made at baseline (Pre1), following the time control (Pre2) and following RT (Post).
Results. A time effect was detected for HRR as there was no change in HRR over the time control portion of the study but a significant increase in HRR from pre training to post training (Table 1⇓, p<0.05). A time effect was also detected for 1RM as there was no change over the time control portion of the study but a significant increase following RT (77.4 ± 4.0 kg to 78.2 ± 3.9 kg to 84.5 ± 3.9 kg, p <0.05). There was no change in VO2max, blood lipids, glucose, body fat, or white blood cell (WBC) count over the course of the study (Table 1⇓, p>0.05).
Conclusions. These findings suggest that RT has a favorable effect on parasympathetic modulation without changing cardiorespiratory fitness, body composition, WBC count or metabolic profile in young healthy men.