C-25 Free Communication/Poster - Cardiovascular: Acute Exrcise: MAY 29, 2008 7:30 AM - 12:30 PM: ROOM: Hall B
Few studies have reported the physiological responses to circuit weight training in males and females. Investigation of possible gender differences could lead to optimal exercise prescriptions and improved adaptational outcomes.
PURPOSE: The purpose of the study was to determine the effects of gender on cardiovascular and metabolic responses to resistance circuit weight training and recovery.
METHODS: Ten healthy males and ten healthy females completed an initial session in order to collect descriptive data and determine a 12 repetition maximum (12-RM) for 6 different upper and lower body resistance exercises. This was followed by two identical sessions of a resistance circuit weight training protocol on two separate days at least 48 hours apart. The first session was used to familiarize subjects with the equipment and the testing protocol; the second session was used to determine physiological responses. Subjects performed 10 repetitions of 6 exercises for 3 circuits at a 12-RM load. VO2 and RER were continuously monitored; heart rate and blood pressure were taken at the end of each circuit.
RESULTS: A gender x time ANOVA revealed a gender effect (P<0.05) for absolute and relative VO, relative lean body mass VO2, systolic blood pressure (SBP), respiratory exchange ratio (RER), and recovery VO2 with greater values across the exercise session for males compared with females. Mean (+/-SE) relative VO2 for males and females rose from resting values of 4.23(1.47)/4.05 (0.73) across the 3 circuits to peak at 19.83(3.32)/13.33(1.45) ml/kg/min, respectively. Resting lean body mass VO2 of 5.02(1.75) and 5.47(1.04) increased to peak values of 23.23(3.56) and 17.74(2.77) ml/kgLBM/min, respectively. SBP rose from 118.3(2.31) and 108(2.73) at rest to peak at the end of 3 circuits at 162.8(16.55) and 143.3(14.31) mmHg, respectively. RER increased in circuit 1 and generally remained above 1.0 during the rest of the resistance exercise, with greater RER for men than women. There were no gender differences heart rate (HR), diastolic blood pressure (DBP), and recovery RER.
CONCLUSIONS: Data indicate greater blood pressure and metabolic responses in males than females during intense circuit training exercise. Gender differences should be considered for development of circuit training protocols.