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17/10/2009

Publication scientifique du mois d'Octobre 2009...

posté à 08h10

Ce mois-ci, j'ai choisi de mettre en avant une étude conduite par le Pr. J Bangsbo, de l'Université de Copenhague, sur les effets d'une stratégie d'entraînement (intensité vs volume) au niveau des adaptations musculaires et de la capacité de performance en course à pied.

J Appl Physiol. 2009

Reduced volume and increased training intensity elevate muscle Na+/K+ pump {alpha}2-subunit expression as well as short- and long-term work capacity in humans.

Bangsbo J, Gunnarsson TP, Wendell J, Nybo L, Thomassen M

The present study examined muscle adaptations and alterations in work capacity in endurance-trained runners as a result of a reduced amount of training combined with speed endurance training.

Seventeen runners were for a 6- to 9-wk period assigned to either a speed endurance group with a 25% reduction in the amount of training but including speed endurance training consisting of 6-12 30-s sprint runs 3-4 times a week (SET, n=12) or a control group (CON, n=5), which continued the endurance training (about 55 km(.)wk(-1)).

For SET the expression of the muscle Na(+)/K(+) pump alpha2-subunit was 68% higher (P<0.05) and plasma K(+) was reduced (P<0.05) during repeated intense running after 9 weeks. Performance in a 30-s sprint test and the first of the supra-maximal exhaustive runs was improved (P<0.05) by 7% and 36%, respectively, after the speed endurance training period. In SET, VO2-max was unaltered, but the 3-K (3,000 m) time was reduced (P<0.05) from 10.4+/-0.1 (mean+/-SEM) to 10.1+/-0.1 min and 10-K (10,000 m) time was improved from 37.3+/-0.4 to 36.3+/-0.4 min. Muscle protein expression and performance remained unaltered in CON.

The present data suggest that both short- and long-term exercise performance can be improved with a reduction in training volume if speed endurance training is performed, and a role of the Na(+)/K(+) pump in the control of K(+) homeostasis and in the development of fatigue during repeated high-intensity exercise.

 


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