Muscular and pulmonary O2 uptake kinetics during moderate- and high-intensity sub-maximal knee-extensor exercise in humans

[EN] The purpose of this investigation was to determine the contribution of muscle O(2) consumption (mVO2) to pulmonary O(2) uptake (pVO2) during both low-intensity (LI) and high-intensity (HI) knee-extension exercise, and during subsequent recovery, in humans. Seven healthy male subjects (age 20-25 years) completed a series of LI and HI square-wave exercise tests in which mVO2 (direct Fick technique) and pVO2 (indirect calorimetry) were measured simultaneously. The mean blood transit time from the muscle capillaries to the lung (MTTc-l) was also estimated (based on measured blood transit times from femoral artery to vein and vein to artery). The kinetics of mVO2 and pVO2 were modelled using non-linear regression. The time constant (tau) describing the phase II pVO2 kinetics following the onset of exercise was not significantly different from the mean response time (initial time delay + tau) for mVO2 kinetics for LI (30 +/- 3 vs 30 +/- 3 s) but was slightly higher (P < 0.05) for HI (32 +/- 3 vs 29 +/- 4 s); the responses were closely correlated (r = 0.95 and r = 0.95; P < 0.01) for both intensities. In recovery, agreement between the responses was more limited both for LI (36 +/- 4 vs 18 +/- 4 s, P < 0.05; r = -0.01) and HI (33 +/- 3 vs 27 +/- 3 s, P > 0.05; r = -0.40). MTTc-l was approximately 17 s just before exercise and decreased to 12 and 10 s after 5 s of exercise for LI and HI, respectively. These data indicate that the phase II pVO2 kinetics reflect mVO2 kinetics during exercise but not during recovery where caution in data interpretation is advised. Increased mVO2 probably makes a small contribution to during the first 15-20 s of exercise.

Análisis de la calidad del dato de un instrumento para la observación del ataque en balonmano playa

[ES] Se presenta el análisis de Calidad del Dato utilizado en la construcción de una herramienta de observación diseñada ad hoc. Se trata de un sistema mixto de formatos de campo y sistemas de categorías exhaustivas y mutuamente excluyentes (E/ME) que tiene como objetivo codificar la fase de ataque del balonmano playa. Se utilizan como criterios: minuto, marcador, zona de finalización y jugador que finaliza. Se han codificado 12 observaciones de selecciones nacionales absolutas masculinas. El análisis se ha realizado utilizando la concordancia consensuada (aproximación cualitativa de la calidad del dato), elaborando un archivo de detección de errores, calculando el índice Kappa de Cohen, los índices de correlación Tau-B de Kendall, Pearson y Spearman; y un análisis de Generalizabilidad. Los resultados de los coeficientes de correlación muestran un índice mínimo de .993, los índices Kappa de Cohen se sitúan en .917 y los índices de generalizabilidad son óptimos. Estos resultados aseguran que la herramienta de observación, además de tener un buen ajuste, permite registrar con fiabilidad y precisión.