The purpose of this study was to investigate an effect and utility of the resistance training for individual difference of a training objective and muscle adaptation. Sixteen healthy males were evaluated characteristics of one repetition maximum (1RM) and the total number of repetitions (Ntotal) loaded at 90%, 70% and 50%1RM of a knee extension exercise prior to this study (pre). Subjects carried out training of knee extension exercise for 12 weeks twice a week. In addition, the training accorded with a plan-do-check-act cycle (PDCA cycle). CSA (muscle cross-sectional area of a quadriceps femoris muscle), 1RM and Ntotal were measured every 3 weeks during a training period to evaluate a training effect. Based on these measurement results, subjects chose from two different training methods (strength・power-up type and bulk-up type) according to a personal training objective and degree of a training effect.
The major findings were:
①1RM, 1RM / CSA and Ntotal in all subjects increased significantly after training.
② Development transitions of 1RM and Ntotal differed greatly according to the individual difference of a training objective and muscle adaptation.
③There is a possibility that a significant increase of 1RM was affected by adaptation of a neuromuscular system.
These results suggest that the personalized resistance training incorporating a PDCA cycle may become more rational and effective practice, as compared with training which performs the same contents to all subjects.
