Navegando por Palavras-chave "Maximal oxygen uptake"
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- ItemAcesso aberto (Open Access)Estudo comparativo de métodos para a predição do consumo máximo de oxigênio e limiar anaeróbio em atletas(Sociedade Brasileira de Medicina do Exercício e do Esporte, 1999-10-01) Mahseredjian, Fabio [UNIFESP]; Barros Neto, Turibio Leite de [UNIFESP]; Tebexreni, Antonio Sergio [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); São Paulo Futebol ClubeThe application of a battery of tests for evaluation of the physical aptitude in laboratory involves a series of highly sophisticated equipment, mainly when the objective is the determination of the aerobic potency (maximum oxygen uptake and anaerobic threshold). The equipment is of high financial cost and requests professionals with good technical and scientific knowledge to handle it, and also, it is impossible to use it in the application of tests in large scale. The analysis of the distance run in a certain period of time or, yet, the time used for a distance set previously, has been a lot used with the goal of estimating or reflecting the aerobic aptitude in children and in adults. The proposal of this study was to analyze the correlation of the Cooper test (CT) with the values of maximum consumption of oxygen (VO2 max) determined through direct method, besides the attempt of validating this field test and another test called the test of 4,000 meters, in anaerobic threshold (AT prediction). Sixty-three players of field soccer were appraised with ages between 15 and 20 years. The athletes were submitted to three tests, one of them was accomplished at the laboratory and the others in the athletics track, in a maximum period of seven days. The laboratory test consisted of the determination of the VO2 max and ventilatory anaerobic threshold (VAT), through analysis of the gaseous changes in a metabolic system analysis on a Vacumed (model CPX Silver edition) Imbramed ergometric treadmill (model ATL 10200), with measurement of the heart rate (HR) with the Polar brand (model Accurex Plus). The first field test followed the protocol determined by Cooper and the second one consisted of a race of 4,000 meters, when determination of the time spent for the preset course was made. The coefficient of linear correlation of Pearson was calculated (r) and the following results were obtained: The speed of LA showed direct significant correlation (r = 0.60 for p < 0.05) with the medium speed in CT. The speed of LA showed direct significant correlation (r = 0.74 for p < 0.05) with the medium speed in T 4000. The VO2 max determined by the direct method did not show significant correlation with the VO2 max (r = 0.23 for p < 0.05) determined through CT. The results suggest that the CT has not the precision required for the prediction of the VO2 max for this population and the possibility of its use for the field tests, like those performed in the present study, in order to obtain the prediction of the anaerobic threshold, and the 4,000 meters test presented larger precision than the CT when the goal is to predict the speed of the anaerobic threshold.
- ItemAcesso aberto (Open Access)Indexes of power and aerobic capacity obtained in cycle ergometry and treadmill running: comparisons between sedentary, runners, cyclists and triathletes(Sociedade Brasileira de Medicina do Exercício e do Esporte, 2003-08-01) Caputo, Fabrizio; Stella, Sérgio Garcia [UNIFESP]; Mello, Marco Tulio de [UNIFESP]; Denadai, Benedito Sérgio; Universidade Estadual Paulista (UNESP); Universidade Federal de São Paulo (UNIFESP)The objectives of this study were: a) to determine, in a cross-sectional manner, the effect of aerobic training on the peak oxygen uptake (
O2peak), the intensity at O2peak (IO2peak) and the anaerobic threshold (AnT) during running and cycling; and b) to verify if the transference of the training effects are dependent on the analized type of exercise or physiological index. Eleven untrained males (UN), nine endurance cyclists (EC), seven endurance runners (ER), and nine triathletes (TR) were submitted, on separate days, to incremental tests until voluntary exhaustion on a mechanical braked cycle ergometer and on a treadmill. The values of O2peak (ml.kg-1.min-1) obtained in running and cycle ergometer (ER = 68.8 ± 6.3 and 62.0 ± 5.0; EC = 60.5 ± 8.0 and 67.6 ± 7.6; TR = 64.5 ± 4.8 and 61.0 ± 4.1; UN = 43.5 ± 7.0 and 36.7 ± 5.6; respectively) were higher in the group that presented specific training in the modality. The UN group presented the lower values of O2peak, regardless of the type of exercise. This same behavior was observed for the AnT (ml.kg-1.min-1) determined in running and cycle ergometer (ER = 56.8 ± 6.9 and 44.8 ± 5.7; EC = 51.2 ± 5.2 and 57.6 ± 7.1; TR = 56.5 ± 5.1 and 49.0 ± 4.8; UN = 33.2 ± 4.2 and 22.6 ± 3.7; respectively). It can be concluded that the transference of the training effects seems to be only partial, independently of the index (O2peak, IO2peak or AnT) or exercise type (running or cycling). In relation to the indices, the specificity of training seems to be less present in the O2peak than in the IO2peak and the AnT. - ItemAcesso aberto (Open Access)Índices fisiológicos associados com a performance aeróbia em corredores de endurance: efeitos da duração da prova(Sociedade Brasileira de Medicina do Exercício e do Esporte, 2004-10-01) Denadai, Benedito Sérgio; Ortiz, Marcelo Janini; Mello, Marco Tulio de [UNIFESP]; Universidade Estadual Paulista (UNESP); Universidade Federal de São Paulo (UNIFESP)The aim of this study was to assess the validity of the maximal oxygen uptake (VO2max), the velocity at VO2max (vVO2max), time to exhaustion at vVO2max (Tlim), running economy (RE) and anaerobic threshold (AnT) to predict the aerobic performance of the endurance athletes. Fourteen well-trained long-distance runners (33.4 ± 4.4 yr.; 62.7 ± 4.3 kg; 166.1 ± 5.0 cm; VO2max = 60.4 ± 5.9 ml.kg-1.min-1) underwent the following tests: a) simulated competitions in the distances of 1500 and 5000 m and; b) laboratory treadmill tests to determine their VO2max, vVO2max, Tlim, EC and AnT. The velocities (km/h) at vVO2max (18.7 + 0.8), LAn (17.3 + 1.1) v1500 m (19.9 + 0.8) and v5000 m (17.9 + 0.9) were significantly different. A stepwise multiple-regression analysis revealed that AnT alone was the best single predictor of v-5000 m and explained 50% of the variability in 5000 m running velocity. For v1.500 m, Tlim and vVO2max explained 88 % of the variability of the performance. We conclude that, in a group of well-trained long-distance runners, the validity of the physiological indexes (VO2max, vVO2max, Tlim, EC e LAn) to predict the aerobic performance is dependent of the distance (1500 x 5000 m) analyzed.
- ItemSomente MetadadadosShort term effects of aerobic training in the clinical management of moderate to severe asthma in children(British Med Journal Publ Group, 1999-03-01) Neder, Jose Alberto [UNIFESP]; Nery, Luiz Eduardo [UNIFESP]; Silva, Antonio Carlos da [UNIFESP]; Cabral, Ana Lucia Barros; Fernandes, Ana Luísa Godoy [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)Background-Aerobic training has a number of well known beneficial effects in both normal and asthmatic children. However, the impact of training on the clinical management of the underlying bronchial asthma remains controversial, particularly in the most severe patients.Methods-Clinical evaluation, spirometric tests, symptom limited maximum exercise testing, and exercise challenge tests were performed in a group of children with stable moderate to severe asthma. Forty two patients (24 boys) aged 8-16 were evaluated twice: before and after supervised aerobic training (group 1, n = 26) and two months apart (untrained group 2, n = 16).Results-Spirometric and maximal exercise variables in the initial evaluation were significantly reduced in group 1 (p<0.05) but medication and clinical scores and the occurrence of exercise induced bronchospasm (EIB) did not differ between the two groups. Aerobic improvement with training (maximal oxygen uptake and/or anaerobic threshold increment >10% and 100 mi) was inversely related to the baseline level of fitness and was independent of disease severity. Although the clinical score and the occurrence of EIB did not change after training, aerobic improvement was associated with a significant reduction in the medication score and the daily use of both inhaled and oral steroids (p<0.05).Conclusions-Aerobic improvement with Methods training in less fit asthmatic children is related to a short term decrease in the daily use of inhaled and oral steroids, independent of the severity of the disease.