Abstract
High intensity strength training causes changes in steroid hormone concentrations. This could be altered by the muscular contraction type: eccentric or concentric. The aim of this study was to compare the effect of the completion of a short concentric (CON) and concentric/eccentric (CON/ECC) trial on the urinary steroid profile, both with the same total work. 18 males performed the trials on an isokinetic dynamometer (BIODEX III) exercising quadriceps muscles, right and left, on different days. Trial 1(CON): 4×10 Concentric knee extension + relax knee flexion, speed 60°/second; rest 90 seconds between each series and 4 minutes between each leg exercise. Trial 2(CON/ECC): 4×5 concentric knee extension + Eccentric knee flexion under similar conditions. Urine samples were taken before the exercise and one hour after finishing it. Androsterone, Etiocholanolone, DHEA, Androstenedione, Testosterone, Epitestosterone, Dehydrotestosterone, Estrone, B-Estradiol, Tetrahydrocortisone, Tetrahydrocortisol, Cortisone and Cortisol (free, glucoconjugated and sulfoconjugated) urinary values were determined using gas chromatography/mass spectrometry techniques. No significant differences were noted in Total Work and Average Peak Torque, although Maximum Peak Torque in the CON/ECC trial was higher than in the CON trial. These results demonstrate no changes in the steroid profile before and after trials, or when comparing CON to CON/ECC trials. The data suggest that eccentric contractions do not cause hormonal changes different to the ones produced by concentric contractions, when they are performed in strength short trials with the same total workload.
Resumen
El entrenamiento de fuerza de alta intensidad provoca variaciones en la concentración de esteroides. El tipo de contracción muscular, excéntrica o concéntrica, podría ser un factor que la alterase. El objetivo de este estudio fue comparar el efecto de la realización de una sesión corta de ejercicio concéntrico (CON) y otra concéntrica/excéntrica (CON/EXC), con la misma carga de trabajo total, sobre el perfil esteroideo urinario. 18 hombres realizaron dos sesiones de ejercicio de corta duración utilizando una máquina isocinética (BIODEX III) en días diferentes y trabajando los músculos cuádriceps de ambas piernas. La sesión de ejercicio 1 (CON) fue un 4×10 rep de extensión concéntrica de rodilla más relajación en el movimiento de flexión, a una velocidad de 60°/segundo y con una recuperación de 90 seg. entre cada serie y 4 minutos entre cada una de las piernas. La sesión de ejercicio 2 (CON/EXC) fue un 4×5 rep. de extensión concéntrica de rodilla más flexión excéntrica de rodilla, con las mismas condiciones de velocidad y recuperación. Muestras de orina fueron se tomaron antes del ejercicio y una hora después de finalizarlo. Los niveles urinarios (fracción libre, glucoconjugada y sulfoconjugada) de Androsterona, Etiocolanolona, DHEA, Androstenodiona, Testosterona, Epitestosterona, Dehidrotestosterona, Estrona, β-estradiol, Tetrahidrocortisona, Tetrahidrocortisol, Cortisona y Cortisol, se determinaron usando técnicas de cromatografía de gases-espectrometría de masas. No se encontraron diferencias significativas en los valores de Trabajo Total y de Pico Torque Medio, aunque los valores de Pico Torque Máximo fueron más alto en el CON/EXC ejercicio que en el CON. Tampoco se observó ningún cambio en el perfil esteroideo urinario entre antes y después de las sesiones de ejercicio, o comparando las sesiones CON/EXC con la CON. Por tanto, los datos sugieren que las contracciones excéntricas no producen alteraciones hormonales diferentes a las producidas por las contracciones concéntricas, cuando se trata de sesiones de ejercicio de fuerza de corta duración con similar carga de trabajo total.
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Timon, R., Olcina, G., Tomas-Carus, P. et al. Urinary steroid profile after the completion of concentric and concentric/eccentric trials with the same total workload. J Physiol Biochem 65, 105–112 (2009). https://doi.org/10.1007/BF03179061
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DOI: https://doi.org/10.1007/BF03179061