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

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 (F2،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.