Back
Reliability of time-to-exhaustion and selected psycho-physiological variables during constant-load cycling at the maximal lactate steady-state
Journal article

Reliability of time-to-exhaustion and selected psycho-physiological variables during constant-load cycling at the maximal lactate steady-state

  • Faude, Oliver Department of Sport, Exercise and Health, University of Basel, Birsstr. 320B, CH-4052 Basel, Switzerland.
  • Hecksteden, Anne Institute of Sports and Preventive Medicine, Saarland University, Campus, Bldg. B8 2, D-66123 Saarbrücken, Germany.
  • Hammes, Daniel Department of Sport, Exercise and Health, University of Basel, Birsstr. 320B, CH-4052 Basel, Switzerland.
  • Schumacher, Franck Institute of Sports and Preventive Medicine, Saarland University, Campus, Bldg. B8 2, D-66123 Saarbrücken, Germany.
  • Besenius, Eric Sports Medicine Research Laboratory, Luxembourg Institute of Health, 76, rue d’Eich, L-146 Luxembourg.
  • Sperlich, Billy Integrative and Experimental Training Science, Institute of Sport Science, University of Würzburg, Judenbühlweg 11, D-97082 Würzburg, Germany.
  • Meyer, Tim Institute of Sports and Preventive Medicine, Saarland University, Campus, Bldg. B8 2, D-66123 Saarbrücken, Germany.
Show more…
Published in:
  • Applied Physiology, Nutrition, and Metabolism. - Canadian Science Publishing. - 2017, vol. 42, no. 2, p. 142-147
Nutrition and Dietetics
Physiology (medical)
Physiology
Endocrinology, Diabetes and Metabolism
General Medicine
English The maximal lactate steady-state (MLSS) is frequently assessed for prescribing endurance exercise intensity. Knowledge of the intra-individual variability of the MLSS is important for practical application. To date, little is known about the reliability of time-to-exhaustion and physiological responses to exercise at MLSS. Twenty-one healthy men (age, 25.2 (SD 3.3) years; height, 1.83 (0.06) m; body mass, 78.9 (8.9) kg; maximal oxygen uptake, 57.1 (10.7) mL·min−1·kg−1) performed 1 incremental exercise test, and 2 constant-load tests to determine MLSS intensity. Subsequently, 2 open-end constant-load tests (MLSS 1 and 2) at MLSS intensity (3.0 (0.7) W·kg−1, 76% (10%) maximal oxygen uptake) were carried out. During the tests, blood lactate concentrations, heart rate, ratings of perceived exertion (RPE), variables of gas exchange, and core body temperature were determined. Time-to-exhaustion was 50.8 (14.0) and 48.2 (16.7) min in MLSS 1 and 2 (mean change: −2.6 (95% confidence interval: −7.8, 2.6)), respectively. The coefficient of variation (CV) was high for time-to-exhaustion (24.6%) and for mean (4.8 (1.2) mmol·L−1) and end (5.4 (1.7) mmol·L−1) blood lactate concentrations (15.7% and 19.3%). The CV of mean exercise values for all other parameters ranged from 1.4% (core temperature) to 8.3% (ventilation). At termination, the CVs ranged from 0.8% (RPE) to 11.8% (breathing frequency). The low reliability of time-to-exhaustion and blood lactate concentration at MLSS indicates that the precise individual intensity prescription may be challenging. Moreover, the obtained data may serve as reference to allow for the separation of intervention effects from random variation in our sample.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/92674
Statistics
Document views: 93 File downloads: