Máximo déficit acumulado de oxigênio em corridas livre e resistida em pista

• Autor(a) principal: Ribeiro, Luiz Fernando Paulino [UNESP]
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108764
• topic: Running; Corridas; Capacidade anaeróbica; Aptidão física do atleta; Oxigenio; Fisiologia

Maximal accumulated oxygen deficit (MAOD) is nowadays taken as the gold standard measure of anaerobic capacity in humans. Namely, the abbreviated procedure known as the procedure #3 by Medbø, seems an interesting testing option for athletes due to practical reasons. But besides the relevance of specificity and the increasing use of portable gas analyzers for the assessment of aerobic parameters in field conditions, information on MAOD assessment, precision or validity in track tests are not available. Thus, the aims of this study were: i) to assess MAOD and its precision in runners by means of the procedure #3 adapted to the track; ii) to analyze the effects of variations regarding the use of resting VO2 (VO2REP) on the regressions used in the MAOD estimation and; iii) to analyze the concurrent validity of such measure by comparing the values attained in free (CL) and resisted (CR) running tests. In a two-week period, 8 sprint runners (21.5 ± 3.2 years; 71.5 ± 6.0 kg; 180 ± 6 cm and 4.9 ± 1.3 % fat) were subjected to 6 experimental sessions separated by 48 - 72 h on a 400 m track, being 3 evaluations carried out in the CL and 3 in the CR conditions. In the later one, a mobile device was used in order to impose an horizontal resistance of 4 % body weight to the subjects. In all tests the VO2 was monitored by means of a portable analyzer using telemetry. Incremental tests were performed in both conditions for the assessment of VO2PICO and vVO2PICO. Linear regressions between velocity and VO2 were determined from 3 submaximal efforts lasting 6 min between ~75 to 96% VO2PICO with and without VO2REP at zero velocity for the estimation of oxygen demand (DO2) for intensities of 120 and 110% vVO2PICO in CL and CR, respectively. Finally, exhaustive bouts at such intensities were carried out being the MAOD computed as the difference between total DO2 (DO2TOT) and accumulated oxygen uptake (VO2AC). Both in CL and CR, the inclusion of VO2REP...