5 kmオープンウォータースイミングのコーチングにおけるトレーニング強度及びストローク指標の検討

抄録

This study investigated the relationship between swim speed, blood lactate concentration, and stroke index by evaluating the 5 km Open Water Swimming Simulated Race (5 km OWSSR) and Lactate Curve Test (LCT) results. Four males and two females performed both tests in a 50 m pool. The 5 km OWSSR course was 120 m per lap. The LCT comprised 400 m with gradual, incremental increases in speed. We measured the natural swimming speed, the swimming speeds at 2 and 4 mmol/l blood lactate concentrations, stroke time, stroke rate (SR),and stroke length. The mean 5 km OWSSR swim speed (1.29±0.04 m/s) significantly differed from the equivalent LCT swim speeds at blood lactate levels of 2 mmol/l (1.21±0.06 m/s) and 4 mmol/l (1.36±0.07 m/s).Also, the 5 km OWSSR mean swim speed significantly correlated with the equivalent LCT swim speed at a blood lactate level of 4 mmol/l. The 5 km OWSSR SR from 1500 to 4500 m did not differ, indicating that the SR during 5 km OWSSR was higher early on in the swim. These results suggest that speed training with a blood lactate concentration of 4 mmol/l and instructing swimmers to increase their SR are effective coaching strategies to improve the 5 km open water swim time.