| Research Abstract |
1. To determine whether there is the same effect on choice reaction time (RT) tasks using unilateral (UL) and bilateral (BL) thumb flexion responses on the bilateral deficit as simple RT training, 34 students were divided into 5 groups: Simple BL, Simple UL left, Simple UL right, Choice response training, and Control. All students in the training group performed each task through 10 trials x 2 blocks, 3 days per week for 6 weeks. Choice RTs for UL and BL tasks at 3 and 6 weeks were shortened compared to those before training (P<0.05). There was no difference, however, found among the training groups. Therefore, there was no lateral specificity for a choice RT in the effect of training for response speed as simple RT. 2. The degree of bilateral deficit is specifically affected by bilateral and unilateral resistance training in the upper and lower limbs. It has been reported that bilateral deficit is caused by the inhibition of fast motor units. To investigate whether the effect of slow
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and fast isokinetic training differs in the mode of modification of bilateral deficit, 51 students were divided into 4 training groups and a control group: Bilateral fast (BF) and slow (BS) (1.2 and 0.4 m/sec), Unilateral (UF) and slow (US) leg extension training group, and Control. The training groups trained three days a week, for 6 weeks. The degree of bilateral deficit in BF at 1.2 m/sec and that in BS at 0.4 m/sec was decreased by training (P<0.05), while bilateral deficit in US at 0.4 m/sec increased (P<0.05), and that for other conditions was not affected by training. Thus, specificity of effect of training velocity on bilateral deficit was observed only in bilateral training. Lateral specificity observed in this study was more marked at a slow velocity than at a fast velocity, which I speculated may be due to the mechanism of bilateral deficit. 3. To investigate the effect of UL leg extension power training by the right or left leg only on bilateral deficit, 41 students were divided into 5 groups: UL left, UL right, UL left and right, BL training, and Control. All subjects in the training group extended their leg(s) at 1.2 m/sec with maximal power 3 days per week for 6 weeks. The magnitude of bilateral deficit for UL left, UL right, and UL left and right group after training were larger than in the BL training group (P<0.05). Therefore, the effect of UL leg extension power training in the left or right leg only on bilateral deficit was the same as that for UL training performed in both the left and right legs. Less
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