scholarly journals Influence of physical activity of the maximum aerobic power on hemo-dynamic and morpho-biochemical of change of erythrocytes of female volleyball players

Author(s):  
B. M. Mytckan ◽  
V. P. Verbovyi ◽  
R. Ya. Chovhan ◽  
N. O. Zemska ◽  
O.F. Kryzanivskaya ◽  
...  
Clinics ◽  
2007 ◽  
Vol 62 (4) ◽  
pp. 391-396 ◽  
Author(s):  
Paulo Roberto Santos-Silva ◽  
Alfredo José Fonseca ◽  
Anita Weigand de Castro ◽  
Júlia Maria D'Andréa Greve ◽  
Arnaldo José Hernandez

1975 ◽  
Vol 38 (2) ◽  
pp. 300-303 ◽  
Author(s):  
S. M. Horvath ◽  
P. B. Raven ◽  
T. E. Dahms ◽  
D. J. Gray

Previous studies had indicated that maximum aerobic power (VO2 max) would be seriously impaired when HbCO levels were above 7% but was not altered if HbCO was around 2.7%. The present studies indicated that the critical level at which HbCO influenced VO2 max was approximately 4.3%. This was accompanied as in the above-noted studied with a reduction in total work time to the attainment of VO2 max. Two procedures to raise HbCO to appropriate levels were employed, i.e., a buildup wherin HbCO was incrementally increased by breathing ambient air containing 75 or 100 ppm CO and a bolus plus maintenance procedure. In the latter, HbCO was raised to the level attained in the buildup test by giving a “bolus” of CO followed by the continued inhalation of CO at a level to just maintain this level of HbCO regardless of the magnitude of the ventilation. Regardless of the mode of presentation, the decrement in VO2 max occurred at the same level of HbCO. These observations are of considerable significance, since it indicated that even low ambient levels of CO (23.7 ppm) would result in lowering maximum aerobic power if the individual had been previously exposed to CO such that the level was raised to this critical point.


Retos ◽  
2015 ◽  
pp. 203-205
Author(s):  
Luis Paulo Gomes Mascarenhas ◽  
Marcos Tadeu Grzelczak ◽  
William Cordeiro de Souza ◽  
Antonio Stabelini Neto ◽  
Yamileth Chacón-Araya ◽  
...  

The purpose of the study was to compare the aerobic power of prepubescent children (Tanner 1 stage). Participants were 95 children between 7 and 9 years old, divided into 4 physical activity level groups: a) Trained (n = 24), b) Sport beginners (n = 23), c) Active (n = 24), and d) Sedentary (n = 24). Physical activity level was determined by a three-day physical activity diary. Subjects performed a treadmill Balk protocol to obtain their peak oxygen uptake. Comparisons were made using ANOVA two-way and post hoc Tukey followed-up the significant differences for p< 0,05. Trained, sport beginners and active children presented similar amount of physical activity level, but they significantly differ from the sedentary children (p< 0.05). Overall boys (50.67 ± 8.52 ml/kg/min) had higher relative peak oxygen uptake than girls (45.19 ± 6.44 ml/kg/min). The gender by group interaction showed that this difference is explained by the superior values of the trained boys (58.80 ± 8.98 ml/kg/min) when compared to trained girls (47.51 ± 5.68 ml/kg/min), even though they presented the same amount of physical activity level. The trained group (53.16 ± 9.34 ml/kg/min) showed higher relative peak oxygen uptake compared to sport beginners (48.90 ± 6.54 ml/kg/min), active children (45.46 ± 7.50 ml/kg/min) and sedentary children (44.63 ± 9.52 ml/kg/min). The results suggest that prepubescent children that participate in systematized trained programs have better physiological indicators for aerobic fitness.Key words. aerobic power, physical activity, children.Resumen. El propósito del estudio fue comparar la potencia aeróbica de niños prepubescentes (Estadio de Tanner 1). Participaron 95 niños y niñas con edades entre 7 y 9 años, divididos en 4 grupos basados en sus niveles de actividad física: a) Entrenados (n = 24), b) Principiantes en deportes (n = 23), c) Activos (n = 24), y d) Sedentarios (n = 24). Los niveles de actividad física se determinaron por medio de un diario de actividad física de tres días. Los participantes realizaron el protocolo de Balke en banda sin fin para obtener el consumo de oxígeno pico. Se hicieron comparaciones con ANOVA de dos vías y post hoc de Tukey cuando se encontraron diferencias significativas a un p < 0.05. Los niños prepubescentes entrenados, principiantes en deportes y activos presentaron niveles de actividad física similares, pero fueron significativamente diferentes de los niños sedentarios (p < 0.05). En general, los niños presentaron mayor consumo de oxígeno pico (50.67 ± 8.52 ml/kg/min) que las niñas (45.19 ± 6.44 ml/kg/min). La interacción de sexo por grupo mostró que esta diferencia se explica por el mayor valor de los niños entrenados (58.80 ± 8.98 ml/kg/min) cuando se les comparó con las niñas entrenadas (47.51 ± 5.68 ml/kg/min), aunque tuvieran el mismo nivel de actividad física. El grupo entrenado (53.16 ± 9.34 ml/kg/min) presentó mayores valores de consumo de oxígeno pico comparados con los principiantes (48.90 ± 6.54 ml/kg/min), niños activos (45.46 ± 7.50 ml/kg/min) y niños sedentarios (44.63 ± 9.52 ml/kg/min). Los resultados sugieren que los niños prepubescentes que participan en programas de entrenamiento sistemáticos tienen mejores indicadores fisiológicos de capacidad aeróbica.Palabras claves. potencia aeróbica, actividad física, niños


1977 ◽  
pp. 279-288
Author(s):  
Joseph Rutenfranz ◽  
Václev Seliger ◽  
Kris Lange Andersen ◽  
Juhani Ilmarinen ◽  
Inge Berndt ◽  
...  

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