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"The maximal accumulated oxygen deficit (MAOD), which is the gold standard for anaerobic energy metabolism capacity, requires multiple tests for evaluation that impose a heavy load on subjects. The maximal accumulated blood lactate (AbLa) concentration is also a measure of anaerobic energy metabolism capacity, and is related to the accumulated oxygen deficit (AOD). Thus, AOD has been estimated by using AbLa (3.0 mL02 * kg-1 * mM"1), but it is unclear if this coefficient is suitable for measurement of supramaximal running of athletes. The purpose of this study was to clarify the estimated expression of AOD by using AbLa from the relationship between MAOD and AbLa during supramaximal running in middle-distance run¬ners. Eleven male middle-distance runners (800m running velocity: 425.3 ± 7.3 m-min'1) took part in this study. They performed three running tests (maximal, submaximal and supramaximal running test) to evaluate MAOD and AbLa. MAOD and AbLa were 56.6 ± 6.0 mL02 * kg'1 and 9.9 ± 1.1 mmolL'1, respectively. We observed a significant positive relationship between MAOD and AbLa (r = 0.73); the regression line equation was y = 3.58x + 18.6. Results showed that the AOD per mM of the AbLa of athletes was 3.58 mL02*kg 1, which was 19% higher than the conventional coefficient value."

"Running economy (RE) at an intensity above the lactate threshold (LT) is reported to be the most important aerobic capacity for estimating 1,500-m running performance. The reason that the RE at intensity better reflects the energy metabolism during a 1,500-m run, is that it is performed above the LT intensity running. This study clarified the relationship be¬tween an 800-m run, which is performed above the LT intensity, and aerobic capacities, includ¬ing the RE measured at intensities below and above the LT. This study included 12 well-trained j male middle-distance runners (800-m velocity: 25.5 ± 0.5 km-h"1, LT intensity: 79.7 ± 5.1%maximal oxygen uptake [VC>2max]). Both the RE of below and above the LT intensity were cal¬culated at 65%V02max (RE6s) and 90%VO2max (RE9o). The 800-m velocity was not related to the VC^max or the LT intensity (r = -0.16 and -0.10, respectively). This velocity correlated with both RE90 and RE65, with the correlation coefficient being higher for RE90 (r = -0.80 vs -0.75). Furthermore, the coefficient of determination for the 800-m velocity determined from V02max, LT intensity and RE90 was higher than that determined from V02max, LT intensity and RE65 (R2 = 0.522 vs 0.428, P = 0.03 vs 0.06). Based on these results, we concluded that the RE at an intensity above the LT might be better than other aerobic capacities for estimating the 800-m running performance, and more than 50% of this performance can be explained by VC max, LT intensity and RE at an intensity above the LT."