[Effects of different types of isokinetic contraction on hemodynamic parameters in men]

ABSTRACT

The purpose of this study was to compare the effect of different types of isokinetic contractions on hemodynamic parameters in men. Ten healthy male subjects [age, 26.1 +/- 3.4 years] in three separate sessions performed three exercise protocols included Concentric/Concentric [C/C], Eccentric/Eccentric [E/E] and Concentric/Eccentric [C/E] contractions [flexion and extension] in the knee joint. In each session subjects performed 4 sets, 10 repetitions, at the speed of 60 degree per second. Hemodynamic parameters [heart rate, systolic blood pressure, diastolic blood pressure, mean arterial blood pressure and rate of pressure product] were measured before exercise, immediately after exercise and after 30 min recovery. Data were analyzed using two- way repeated measures of ANOVA. Statistical analysis of data showed significant increases in heart rate, systolic blood pressure [P<0.001], mean arterial blood pressure [P=0.053] and rate of pressure product [P<0.001] during exercise and significant reductions in these parameters in recovery period. Rate of perceived exertion [RPE] was significantly different among the contraction protocols [F[2,34]=15.5] and post-hoc test showed that RPE was lower in E/E protocol than the other two protocols. Hemodynamic parameters change in response to different muscular contractions, though these changes are not related to contraction type