This study aimed to investigate the after effects of wearing a high-performance swimsuit （HS） during training and warming-up swim on swimming motion and 100m swim performance. Trained collegiate male swimmers participated in this study. Three subjects performed 3 × 10-min swims using a swimming flume with about 15 minutes rest periods on land. The 1st and the 3rd swims were in a normal swimsuit （SS） and the 2nd was in a HS. The positions of the hip and the knee during the 2nd tended to be higher than those during the 1st, and those during the 3rd were similar to those observed during the 2nd rather than those during the 1st. Seven subjects performed prescribed warming-up swim, followed by a maximal 100m swim after about 30 min rest on land. The warming-up swim were conducted in a HS or a SS, and the 100m swims were conducted in a competitive swimsuit using indoor 50m pool. Total time over the 100m swims and lap time for each 10m interval from 25m to 75m point were recorded. Blood lactate concentrations （LA） after the 100m swims were measured. No significant differences were found in total time and LA between two suit conditions. However, each lap time during the first half of the 100m swim tended to be shorten when warming up with wearing a HS. These results suggested that submaximal 10-min swim in a HS had after effects on maintaining a body position during post-swim in a SS, and furthermore, warming-up swim conducted in s HS were effective and implementable way to improve swim performance during less than 100m swims. To verify effective usage of wearing a HS as an assisted training gear, further researches were required.
