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Rivista di Medicina, Traumatologia e Psicologia dello Sport

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The Journal of Sports Medicine and Physical Fitness 2015 Dec 03

lingua: Inglese

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.

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