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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
Rivista di Medicina, Traumatologia e Psicologia dello Sport
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
The Journal of Sports Medicine and Physical Fitness 2015 Dec 03
Gas exchange threshold and the first muscle oxyhemoglobin inflection point are correlated to time-to-exhaustion during heavy intensity exercise
Coquart J. B. 1, Mucci P. 2, L’hermette M. 1, Chamari K. 3, 4, Tourny C. 1, Garcin M. 2 ✉
1 Université de Rouen, Faculté des Sports, CETAPS, EA3238, Mont Saint Aignan, France;
2 Univ Lille Nord de France, Lille, France, UDSL, EA4488, Ronchin, France;
3 Athlete Health and Performance Research Centre, ASPETAR, Doha, Qatar;
4 Orthopaedic and Sports Medicine Hospital, Doha, Qatar
AIM: The twofold aim of the study was to: 1) compare the gas exchange threshold (GET), the first oxyhemoglobin inflection point ([O2Hb]-T), and perceptual threshold as determined during an incremental exercise test, and 2) investigate the link between each threshold and time-to-exhaustion during heavy intensity exercise.
METHODS: Fourteen competitive cyclists performed an incremental exercise test to exhaustion on a cycloergometer to determine the different thresholds and peak workload (Wpeak). The participants then performed a sub-maximal constant workload test (90% Wpeak) to exhaustion to determine time-to-exhaustion. The thresholds were identified from: 1) the first breakpoint in the oxygen uptake vs carbon dioxide output curve (GET), 2) the first muscle oxyhemoglobin inflection point ([O2Hb]-T), and 3) a rating of 13 in perceived exertion (perceptual threshold: RPE13-T).
RESULTS: Oxygen uptake at the different thresholds was not significantly different (P > 0.05). Moreover, GET and [O2Hb]-T were significantly correlated: (1) to each other (r ≥ 0.79; P ≤ 0.001) and (2) to time-to- exhaustion (r = 0.81 and r = 0.72, respectively; P < 0.01). RPE13-T, however, was not significantly correlated with the time-to-exhaustion (P = 0.148).
CONCLUSION: The 'anaerobic threshold' as identified from GET was concomitant to [O2Hb]-T. Both thresholds were correlated to time-to-exhaustion, and could therefore be used as a performance index in middle-duration events.