摘要：Problem statement. Biomechanical factors influencing swimming performance in age-group athletes have been presented in scientific literature in recent years. Frequent analysis of swimming biomechanics is a means of controlling the training loads used in successive phases of the macrocycle. Literature provides information about changes in kinematics caused by reduction of training volume whereas data concerning effects of increasing training volume are rare. The aim of the study was to assess the effects of a seven-day conditioning camp with increased training volume to biomechanical variables of 400 m freestyle performance among age-group swimmers. Methods. Ten female and ten male swimmers aged 12-13 years participated in a seven-day camp,where training volume was increased by 30% compared to pre-camp weeks. Basic anthropometric measurements were taken during the camp and eight days afterwards. Young athletes performed three 400 m freestyle trials at the beginning of the camp,at the end of the camp,and eight days after the camp during the competition. The performance was video-recorded and biomechanical variables were calculated with Stroke Mechanics Test. Results. Stroke rate,stroke length and stroke index values increased slightly during the study period (p>0.05). Swimming speed increased substantially from the beginning of the camp to the competition (p<0.05). Stroke index was strongly correlated with swimming speed in all dates of performance (r>0.71,p<0.05). Stroke rate did not show significant correlations with swimming speed,whereas stroke length was associated with performance time during competition. Conclusions. Short-term increase of training volume in camp conditions may be beneficial in improvement of swimming technique and increase the swimming speed among age-group swimmers.
