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The purpose of this study was to discuss the effect of swimming e妊iciency(e), buoyancy, and participation of aerobic and anaerobic metabolism on the relationship between swimming performance and energy metabolic capacity. The maximal oxygen debt (0% debtmax) and maximal oxygen uptake (VO%max) were measured after and during swimming in a swimming flume, as a parameter of anaerobic and aerobic capacity, respectively. Oxygen requirement (E) and swimming efficiency (e) were ca1culated from 0% debtmaxo VO%max. and swimming record. The subjects consisted of 44 freestyle swimmers with different sex, age and swimming record. The correlation between 0% debtmax and 100m swimming speed was r=0.551 (p<O.Ol) for the group of whole subjects, while the coefficients for the three groups c1assified in terms of e) (e in 100m swimming) were r=0.739 (pく0.01)for the low e) group (N=14, e)~3.33), r=0.912 (p<O.Ol) for the intermediate e) group (N=17, 3.33<e)~4.19), and r=0.645 (p<0.05) for the high e) group (N=13, -U9<e)). 1 Hiroshima Uniarsity, Faculty 0/ Education, Deparlment 0/ Health and Physi, ω1 Education, 2・17Midori二mach, Fukuyama-shi, Hiroshima (720) 2 Unirersity 0/ Tsukuba, Mωter's Program in Health and Physical Education, Sakura-mura, Niihari-gun, lbarakiβoεJ 3 Unh'crsity 0/ Tsukuba, lnstitute 0/ Health and SPOrl S ,αience, Sakura-mura, Nii.加ri-.伊 n,lbarakiβ05) 296 体育学研究第29巻第4号昭和60年3月 The correlation coefficient between VO%mu and 400m swimming speed was r=0.554 (pく0.01)for the whole group inc1uding al the subjects, while these coefficients for the sub.groups formed for e4 (e in 400m swimming) were r=0.730 (p<0.01) for the low e. group (N=14, e.~5.24), r=0.927 (p<0.01) for the intermediate e4 group (N=17, 5.24くe.~6.56) and r=0.486 for the high e. group (N=13, 6.56<e4). Thus, correlations between swimming performance and metabolic capacity became higher for the group of subjects with homogeneous e than for the group of whole subjects with greater variabi1 ity in their e. This result suggests that the relationship between swimming performance and metabolic capacity is markedly effected by the factor of e. Correlations between swimming performance and metabolic capacity were higher in absolute value than in relative valu巴(/kg).This is probably because body weight is supported by buoyancy in sWlmmmg. Swimming performances in 100m and 400m races correlated higher with E than with 0% debtma or VO!max. This suggests that contributions of aerobic metabolism in sprint race, and of anaerobic metabo1ism in middle and long distance races should not be underestimated. (Takashi Kurokawa, Taiji Togashi, Takeo Nomura and Haruo Ikegami,“Relationship between swimming performance and maximal oxygen debt, maximal oxygen uptake, and oxygen requirement", Jap. ! Phys. Educ., 29-4: 295-305, March, 1985)