title: Can heart rate values obtained from laboratory and field lactate tests be used interchangeably to prescribe exercise intensity for soccer players?
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 x hr(-1), respectively. Velocity was then increased by 1 km x 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 paired t tests to look for differences between treadmill and field data. Coefficients of variation and Blan-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 x 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.
authors: Department of Sport Medicine, Ankara University School of Medicine, Ankara, Turkey.
authors: Bunak
authors: B
authors: Kunduracioglu
authors: Rustu
authors: R
authors: Guner
authors: Bulent
authors: B
authors: Ulkar
authors: Ali
authors: A
authors: Erdogan
mesh_terms: D000293:Adolescent; D015444:Exercise; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010807:Physical Endurance; D015203:Reproducibility of Results; D012420:Running; D012916:Soccer
chemical_list: D019344:Lactic Acid