When measuring endurance performance, it is important to understand the day-to-day variation in performance and training load parameters. The aim of the present study was to analyse test-retest variation of constant load running test at anaerobic threshold intensity. Endurance trained subjects (women and men, n = 24) completed one maximal graded exercise test to determine anaerobic threshold (AT) followed by two 35 minutes submaximal constant load tests on the treadmill with 3-5 days between the tests to determine day-to-day variability. The first 30 minutes in the constant load tests were performed at the AT velocity (i.e. maximal lactate steady state test, MLSS) and the speed was increased by 0.6 km/h for the last 5 minutes. Heart rate was recorded during the whole test and blood lactate was analysed from fingertip blood samples taken 10, 15, 20, 25, 30 and 35 min from the beginning of the test. No significant differences were observed in blood lactate between the MLSS tests, but the heart rate was significantly lower (p<0.05) during the second compared to the first test. However, there were more within-subject variation in lactate (CV 8.4-12.7 %) than in heart rate (CV 1.1-1.3 %). Also, ICC values were 0.752 and 0.905 for lactate and heart rate, respectively. The results indicate that there may have been some learning effect between the MLSS tests or some extra tension before the first MLSS test. Therefore, it could be recommended to perform some training loads before the tests. As a coach or a fitness tester, it is important to understand the day-to-day variation in athlete`s performance in order to do correct interpretations of the test results. Contact: Kainlauri, Viivi; Ahtiainen, Juha: Neuromuscular Research Center, Biology of Physical Activity, Faculty of Sport and Health Sciences, University of Jyväskylä, Finland; Hynynen, Esa; Nummela, Ari: KIHU-Research Institute for Olympic Sports, Jyväskylä, Finland
© Copyright 2020 19th International Symposium "Modern Science and Practice for Strength and Endurance Training" October 10-12, 2018. Veröffentlicht von Neuromuscular Research Center and Biology of Physical Activity, Faculty of Sport and Health Sciences, University of Jyväskylä. Alle Rechte vorbehalten.