NDLI: Effects of training in normoxia and normobaric hypoxia on time to exhaustion at the maximum rate of oxygen uptake

Content Provider	Springer Nature Link
Author	Messonnier, Laurent Geyssant, André Hintzy, Frédérique Lacour, Jean René
Copyright Year	2004
Abstract	The effects of endurance training in normoxia or in hypoxia on time to exhaustion (T lim) at the work rate corresponding to peak oxygen uptake (V̇O2peak) were examined at sea level in 13 healthy subjects. Before and after training the subjects performed the following: (1) incremental exercises up to exhaustion to determine peak oxygen uptake in normoxia (V̇O2peakN), the percentage of this value at the 4 mmol l−1 blood lactate concentration (V̇O24%N) and the work rate corresponding to V̇O2peakN (PapeakN), (2) a 5-min 90% PapeakN exercise followed by a 10-min passive recovery to determine the maximal blood lactate concentration (Lamax) measured during the recovery, and (3) a T lim at PapeakN. Training consisted of pedalling 2 h a day, 6 days a week, for 4 weeks. Five subjects trained in normobaric hypoxia [HT; partial pressure of inhaled oxygen (P IO2) 89 mmHg] and eight subjects trained at the same relative work rates in normoxia (NT; P IO2 141 mmHg). The training-induced improvement of all the measured parameters were closely matched between the HT and the NT (P>0.05). Training increased T lim by 59.7% [164(40) s]. The value of T lim was related to V̇O24%N and to Lamax before and after training. Also, the training-induced improvement of T lim was related to the concomitant decrease in Lamax. It is concluded that: (1) endurance training including continuous high-intensity exercises improves T lim for exercises performed at the same relative (higher absolute) work rate after training, (2) intermittent hypoxic training has no potentiating effect on T lim as compared with training in normoxia, and (3) the intra-individual training-induced improvement of T lim was associated with metabolic alteration in relation to lactate accumulation.
Starting Page	470
Ending Page	476
Page Count	7
File Format	PDF
ISSN	14396319
Journal	European Journal of Applied Physiology
Volume Number	92
Issue Number	4
e-ISSN	14396327
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-05-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Humans Lactate Performance Longitudinal study
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physiology (medical) Public Health, Environmental and Occupational Health Sports Science

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