| Autor: |
Takuya WATANABE, Ryo SAKAGUCHI, Naoya TAKEI, Katsityuiki KAKINOK!, Hideo HATTA |
| Zdroj: |
Advances in Exercise & Sports Physiology; Jun2023, Vol. 29 Issue 1, p9-12, 4p |
| Abstrakt: |
The 800m running event is an exercise that employs both aerobic and anaerobic energy systems. However, it is difficult to determine the contribution of each system from only the blood lactate concentration at a single time point. Previous research that used mathematical modeling to analyze the lactate recovery curve following exercise found that estimated model parameters indicated the ability of the tissues and organs to exchange or remove lactate. This study aimed to examine lactate kinetics and the leeway of the point at which the runner passes 400m in the 800m run. Therefore, this study compared the first 400m of the self-paced 800m run, and the maximal 400m run. Three middle-distance runners were asked to run 400m at two different paces-the simulated 800m run and maximum effort. Blood lactate concentrations were measured every 3-5 minutes after each run. The changes in post-exercise lactate concentration were modeled as a biexponential time function consisting of lactate exchange and lactate removal terms, estimated by the least-squares method. In all subjects, the running time was faster, and rate of perceived exertion (RPE) and maximum blood lactate concentration were higher in the maximal trial compared to the simulated 800m pace trial. The parameters estimated by modeling had a similar trend to previous research. There was no discernible trend in the magnitude relationship of each parameter across subjects when comparing the two trials. It could be attributed to the sensitivity of the parameters in high intensity. It was shown that mathematical modeling might be suitable for obtaining new information about lactate metabolism during exercise, even in high-intensity exercises such as 800m runs. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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