Utiliza este identificador para citar o vincular este elemento: http://hdl.handle.net/10553/6544
Títulos: Human muscle net K(+) release during exercise is unaffected by elevated anaerobic metabolism, but reduced after prolonged acclimatization to 4,100 m
Autores/as: Nordsborg, N.B.
Calbet, José A.L. 
Sander, M.
van Hall, Gerrit
Juel, C.
Saltin, Bengt
Lundby, Carsten
Clasificación UNESCO: 241106 Fisiología del ejercicio
Palabras clave: Potassium
Exercise
Altitude
Hypoxia
Fecha de publicación: 2010
Resumen: It was investigated whether skeletal muscle K(+) release is linked to the degree of anaerobic energy production. Six subjects performed an incremental bicycle exercise test in normoxic and hypoxic conditions prior to and after 2 and 8 wk of acclimatization to 4,100 m. The highest workload completed by all subjects in all trials was 260 W. With acute hypoxic exposure prior to acclimatization, venous plasma [K(+)] was lower (P < 0.05) in normoxia (4.9 +/- 0.1 mM) than hypoxia (5.2 +/- 0.2 mM) at 260 W, but similar at exhaustion, which occurred at 400 +/- 9 W and 307 +/- 7 W (P < 0.05), respectively. At the same absolute exercise intensity, leg net K(+) release was unaffected by hypoxic exposure independent of acclimatization. After 8 wk of acclimatization, no difference existed in venous plasma [K(+)] between the normoxic and hypoxic trial, either at submaximal intensities or at exhaustion (360 +/- 14 W vs. 313 +/- 8 W; P < 0.05). At the same absolute exercise intensity, leg net K(+) release was less (P < 0.001) than prior to acclimatization and reached negative values in both hypoxic and normoxic conditions after acclimatization. Moreover, the reduction in plasma volume during exercise relative to rest was less (P < 0.01) in normoxic than hypoxic conditions, irrespective of the degree of acclimatization (at 260 W prior to acclimatization: -4.9 +/- 0.8% in normoxia and -10.0 +/- 0.4% in hypoxia). It is concluded that leg net K(+) release is unrelated to anaerobic energy production and that acclimatization reduces leg net K(+) release during exercise.
URI: http://hdl.handle.net/10553/6544
ISSN: 0363-6119
DOI: 10.1152/ajpregu.00062.2010
Aparece en la colección:Artículos

Archivos en este elemento:
Archivo Descripción TamañoFormato 
Human_muscle_net.pdfHuman muscle net K(+) release during exercise is unaffected by elevated anaerobic metabolism, but reduced after prolonged acclimatization to 4,100 m722,18 kBAdobe PDFObserva/Abre
Muestra el registro completo del elemento

Citas SCOPUSTM   

4
actualizado el 26-nov-2018

Citas de WEB OF SCIENCETM
Citations

4
actualizado el 03-ene-2019

Vista de página(s) 10

2
actualizado el 04-ene-2019

Google ScholarTM

Verifica

Altmetric


Este elemento está sujeto a una licencia Licencia Creative Commons Creative Commons