ABSTRACT
The purpose of this study was to investigate the acute effects on excess post-exercise oxygen consumption (EPOC) of low intensity and slow-movement repetitive resistance exercise in moderately trained young men. Seven healthy trained young men (age=22±3 yr ; height=172.5±4.0 cm ; weight=69.5±8.3 kg ; VO<sub>2</sub>max=47.3±6.0 ml/kg/min) performed the following three exercise patterns on separate days : 1) high-intensity (80% one-repetition maximum : 1RM) and regular-movement repetitive exercise (1 second each of concentric and eccentric action, termed high and regular exercise (HRE) ; 2) low-intensity (50%1RM), regular-movement repetitive exercise (same movement speed as for HRE but termed low and regular exercise (LRE); and 3) low-intensity (50%1RM), slow-movement repetitive exercise (4 sec each of concentric and eccentric action, termed low and slow exercise (LSE). These three exercise patterns consisted of three sets of four exercises performed to maximum repetition. All subjects completed the three exercise sessions in a randomized and counterbalanced fashion. Oxygen consumption (VO<sub>2</sub>) and heart rate (HR) were continuously monitored during the exercise sessions and for 90 min afterwards. EPOC over 90 min was thus observed after completing the three exercise patterns. However, there were no significant differences in EPOC among the three exercise patterns. The results of this study suggest that low-intensity and slow-movement repetitive resistance exercise with maintaining muscular tension (LSE) is likely to increase EPOC to the same extent as HRE and LRE exercise patterns.
ABSTRACT
The purpose of this study was to evaluate the fat-free mass (FFM) of the total body, the upper limbs, and the lower limbs in healthy subjects and basketball players obtained by the new 8-electrode segmental bioelectrical impedance analysis (S-BIA) and to compare the results with the FFM obtained by DXA. The participants were 30 healthy subjects (15 men and 15 women) aged 24.9±3.5 years old and 15 female basketball players aged 23.1±3.1 years old. In the healthy subjects, positive correlations (p<0.001) were observed between the FFM obtained by S-BIA and DXA of the total body (r=0.973), the upper limbs (r=0.956), and the lower limbs (r=0.954). Similarly, in the basketball players, positive correlations (p<0.001, p<0.01) were observed between the FFM obtained by S-BIA and DXA of the total body (r=0.943), the upper limbs (r=0.743), and the lower limbs (r=0.934). The results suggest that the new 8-electrode S-BIA is a valid and convenient method for analyzing body composition of the total body and the body segments in healthy subjects and athletes.
ABSTRACT
15 healthy elderly adults (68.6±4.5 years old) participated in this study and were chosen at random for either super low-velocity repetition training (SLT : n=7) or general low-velocity repetition training (GLT : n=8). All subjects performed machine training leg work twice a week for 6 months. Training contents of SLT and GLT were programmed as follows : SLT (Method : 4 seconds of lifting and 6 sec of lowering) and GLT (Method : 2 sec of lifting and 2 sec of lowering). Muscular strength testing was adopted during isometric knee extension using Cybex6000, and body composition was measured by DXA method. As a result, increases in peak torque values and 5 sec average torques value were significantly different in both groups, pre- and post-training (p<0.05). However, there was no significant difference between the two groups. Fat mass significantly decreased during post-training in both groups (p<0.05); however, there was no significant difference between the groups. SLT showed that increases in maximum muscular strength and endurance were similar to GLT. Thus, low-intensity and low-velocity repetition training is suggested as an effective method for elderly adults to increase lower limb muscular strength.