Abstract
This study was undertaken to investigate the relationship between blood lactate concentration ([La]) and heart rate (HR) values obtained during treadmill and field tests at fixed velocities with respect to interchangeability of results to be used in exercise prescription. A total of 22 male soccer players participated in the study. Each player performed exercise tests on a motorized treadmill and in the field with 3-min runs and 30 s allowed for blood sampling. During both tests, velocities at the first, second, and third stages were 8, 10, and 12 km·hr−1, respectively. Velocity was then increased by 1 km·hr−1 every 3 min until exhaustion. During the field test, players ran on artificial turf on a 120-m hexagonal track marked with cones placed 20 m apart. Running velocity was controlled by means of audio signals. Blood samples were analyzed immediately with an automated lactate analyzer. HR was monitored continuously at 5-s intervals. Data were analyzed with Student’s pairedt tests to look for differences between treadmill and field data. Coefficients of variation and Bland-Altman plots assessed agreement of HR and blood [La] values between the 2 tests. Although running velocities corresponding to a fixed blood [La] of 4 mmol L−1 showed significant differences between treadmill and field tests (15.9±0.9 vs 14.1 ±0.7 km·h−1, respectively) (P < .01), no significant difference between HR values was noted (190±7 vs 187±7, field vs laboratory, respectively). Overall, the mean intermeasurement coefficient of variation was 4.8% (±0.9%) for HR. Although the lowest coefficient of variation (2.4%) was found, fairly wide differences between individual field and laboratory HR values at velocities corresponding to fixed blood [La] of 4 mmol·L−1 cast doubt on the interchangeability of tests.
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Kunduracioglu, B., Guner, R., Ulkar, B. et al. Can heart rate values obtained from laboratory and field lactate tests be used interchangeably to prescribe exercise intensity for soccer players?. Adv Therapy 24, 890–902 (2007). https://doi.org/10.1007/BF02849982
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DOI: https://doi.org/10.1007/BF02849982