TY  - JOUR
AU  - Chiba, Tomonori
A2  - Chiba, Tomonori
A2  - Ishii, H.
A2  - Takahashi, S.
A2  - Yano, T.
DB  - BISp
DP  - BISp
KW  - Blutlaktat
KW  - Blutuntersuchung
KW  - Elektrolytkonzentration
KW  - Fahrradergometerbelastung
KW  - Fahrradergometrie
KW  - Hitzebelastung
KW  - Hyperventilation
KW  - Leistungsphysiologie
KW  - Sportmedizin
KW  - Untersuchung, empirische
KW  - Ventilation
LA  - eng
TI  - Relationship between blood lactate and hyperventilation during high-intensity constant-load exercise in heat
TT  - Beziehung zwischen Blutlaktat und Hyperventilation während konstanter hochintensiver Belastung bei Hitze
PY  - 2011
N2  - The purpose of this study was to examine the relationship between hyperventilation and increase in blood lactate during high-intensity constant-load exercise in heat and normal conditions. Seven male volunteers exercised for 10 min on a cycle ergometer at 80% ·VO2max in heat (40ºC, 50% relative humidity: HT) and normal conditions (20ºC, 50% relative humidity: CON). Oxygen uptake, carbon dioxide output, ventilation, blood lactate and blood electrolytes (K+, Na+, Cl−) were measured in HT and CON. We found that ventilation was significantly higher during exercise in HT compared with CON (p<0.05) and RER tends to be higher in HT than in CON. Blood lactate was significantly higher at 3 min during exercise in HT compared with CON (5.96 ± 0.57 mEq·l-1 5.00 ± 0.28 mEq·l-1, p<0.05). Change in strong ion difference [∆SID = (∆K+ + ∆Na+) − (∆Cl− + ∆La−)], which affects ∆HCO3− in blood significantly, was lower at 5 min during exercise in HT compared with in CON (p<0.05). These results suggest that hyperventilation during exercise in heat would induce lower HCO3− in blood and consequently would result in an increase in blood lactate at an earlier time during high-intensity exercise in heat. It was concluded that hyperventilation during short-term high-intensity exercise in heat is temporarily associated with an increase in blood lactate. Verf.-Referat
L2  - http://biolsport.com/fulltxt.php?ICID=959281
L2  - https://dx.doi.org/10.5604/959281
DO  - 10.5604/959281
SP  - S. 159-163
SN  - 0860-021X
JO  - Biology of sport
IS  - 3
VL  - 28
M3  - Elektronische Ressource (online)
M3  - Gedruckte Ressource
ID  - PU201208005580
ER  -