Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of Applied Physiology |
| Vol/bind | 100 |
| Udgave nummer | 1 |
| Sider (fra-til) | 203-211 |
| Antal sider | 8 |
| ISSN | 8750-7587 |
| DOI | |
| Status | Udgivet - 2005 |
Bibliografisk note
Keywords: Adaptation, Physiological; Adult; Aerobiosis; Altitude; Erythropoiesis; Exercise; Humans; Physical Endurance; Physical Exertion; Physical Fitness; Psychomotor Performance; RunningAdgang til dokumentet
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I: Journal of Applied Physiology, Bind 100, Nr. 1, 2005, s. 203-211.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
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TY - JOUR
T1 - Eighteen days of "living high, training low" stimulate erythropoiesis and enhance aerobic performance in elite middle-distance runners
AU - Brugniaux, Julien V
AU - Schmitt, Laurent
AU - Robach, Paul
AU - Nicolet, Gérard
AU - Fouillot, Jean-Pierre
AU - Moutereau, Stéphane
AU - Lasne, Françoise
AU - Pialoux, Vincent
AU - Saas, Philippe
AU - Chorvot, Marie-Claude
AU - Cornolo, Jérémy
AU - Olsen, Niels V
AU - Richalet, Jean-Paul
N1 - Keywords: Adaptation, Physiological; Adult; Aerobiosis; Altitude; Erythropoiesis; Exercise; Humans; Physical Endurance; Physical Exertion; Physical Fitness; Psychomotor Performance; Running
PY - 2005
Y1 - 2005
N2 - The efficiency of "living high, training low" (LHTL) remains controversial, despite its wide utilization. This study aimed to verify whether maximal and/or submaximal aerobic performance were modified by LHTL and whether these effects persist for 15 days after returning to normoxia. Last, we tried to elucidate whether the mechanisms involved were only related to changes in oxygen-carrying capacity. Eleven elite middle-distance runners were tested before (Pre), at the end (Post1), and 15 days after the end (Post2) of an 18-day LHTL session. Hypoxic group (LHTL, n = 5) spent 14 h/day in hypoxia (6 nights at 2,500 m and 12 nights at 3,000 m), whereas the control group (CON, n = 6) slept in normoxia (1,200 m). Both LHTL and CON trained at 1,200 m. Maximal oxygen uptake and maximal aerobic power were improved at Post1 and Post2 for LHTL only (+7.1 and +3.4% for maximal oxygen uptake, +8.4 and +4.7% for maximal aerobic power, respectively). Similarly oxygen uptake and ventilation at ventilatory threshold increased in LHTL only (+18.1 and +12.2% at Post1, +15.9 and +15.4% at Post2, respectively). Heart rate during a 10-min run at 19.5 km/h decreased for LHTL at Post2 (-4.4%). Despite the stimulation of erythropoiesis in LHTL shown by the 27.4% increase in serum transferrin receptor and the 10.1% increase in total hemoglobin mass, red cell volume was not significantly increased at Post1 (+9.2%, not significant). Therefore, both maximal and submaximal aerobic performance in elite runners were increased by LHTL mainly linked to an improvement in oxygen transport in early return to normoxia and probably to other process at Post2.
AB - The efficiency of "living high, training low" (LHTL) remains controversial, despite its wide utilization. This study aimed to verify whether maximal and/or submaximal aerobic performance were modified by LHTL and whether these effects persist for 15 days after returning to normoxia. Last, we tried to elucidate whether the mechanisms involved were only related to changes in oxygen-carrying capacity. Eleven elite middle-distance runners were tested before (Pre), at the end (Post1), and 15 days after the end (Post2) of an 18-day LHTL session. Hypoxic group (LHTL, n = 5) spent 14 h/day in hypoxia (6 nights at 2,500 m and 12 nights at 3,000 m), whereas the control group (CON, n = 6) slept in normoxia (1,200 m). Both LHTL and CON trained at 1,200 m. Maximal oxygen uptake and maximal aerobic power were improved at Post1 and Post2 for LHTL only (+7.1 and +3.4% for maximal oxygen uptake, +8.4 and +4.7% for maximal aerobic power, respectively). Similarly oxygen uptake and ventilation at ventilatory threshold increased in LHTL only (+18.1 and +12.2% at Post1, +15.9 and +15.4% at Post2, respectively). Heart rate during a 10-min run at 19.5 km/h decreased for LHTL at Post2 (-4.4%). Despite the stimulation of erythropoiesis in LHTL shown by the 27.4% increase in serum transferrin receptor and the 10.1% increase in total hemoglobin mass, red cell volume was not significantly increased at Post1 (+9.2%, not significant). Therefore, both maximal and submaximal aerobic performance in elite runners were increased by LHTL mainly linked to an improvement in oxygen transport in early return to normoxia and probably to other process at Post2.
U2 - 10.1152/japplphysiol.00808.2005
DO - 10.1152/japplphysiol.00808.2005
M3 - Journal article
C2 - 16179396
SN - 8750-7587
VL - 100
SP - 203
EP - 211
JO - Journal of Applied Physiology
JF - Journal of Applied Physiology
IS - 1
ER -