Influence of the selection from incremental stages on lactate minimum intensity: a pilot study

• Published in: Revista brasileira de cineantropometria & desempenho humano 2013-01, Vol.15 (6), p.715-725
• Main Authors: Miyagi, Willian Eiji, Leite, Jorge Vieira de Mello, Zagatto, Alessandro Moura
• Format: Article
• Language: Portuguese
• ISSN: 1415-8426; 1980-0037
• DOI: 10.5007/1980-0037.2013v15n6p715

The purposes of this study were to assess the influence of stage selection from the incremental phase and the use of peak lactate after hyperlactatemia induction on the determination of the lactate minimum intensity (iLACmin). Twelve moderately active university students (23 + or - 5 years, 78.3 + or - 14.1 kg, 175.3 + or - 5.1 cm) performed a maximal incremental test to determine the respiratory compensation point (RCP) (initial intensity at 70 W and increments of 17.5 W every 2 minutes) and a lactate minimum test (induction with the Wingate test, the incremental test started at 30 W below RCP with increments of 10 W every 3 minutes) on a cycle ergometer. The iLACmin was determined using second order polynomial adjustment applying five exercise stage selection: 1) using all stages ( iLACmin sub(P)); 2) using all stages below and two stages above iLACmin sub(P) (iTACmin sub(A)); 3) using two stages below and all stages above iLACmin sub(P) (iLACmin sub(B)); 4) using the largest and same possible number of stages below and above the iLACmin sub(P) (iLACmin sub(I)); 5) using all stages and peak lactate after hyperlactatemia induction (iLACmin sub(D)). No differences were found between the iLACmin sub(p)(138.2 + or - 30.2 W), iLACmin sub(A) (139.1 + or - 29.1 W), iLACmin sub(B) (135.3 + or - 14.2 W), iLACmin sub(I) (138.6 + or - 20.5 W) and iLACmi sub(D) (136.7 + or - 28.5 W) protocols, and a high level of agreement between these intensities and iLACmin sub(P) was observed. Oxygen uptake, heart rate, rating of perceived exertion and lactate corresponding to these intensities was not different and was strongly correlated. However, the iLACmin sub(B) presented the lowest success rate (66.7%). In conclusion, stage selection did not influence the determination of iLACmin but modified the success rate.Original Abstract: Os objetivos foram verificar a influencia da selecao de estagios da fase incremental e o uso do lactato pico apos inducao hiperlactacidemica na determinacao da intensidade de lactato minimo (iLACmin). Doze universitarios moderadamente ativos (23 + or - 5 anos, 78,3 + or - 14,1 kg, 175,3 + or - 5,1 cm) realizaram um teste incremental maximo para determinacao do ponto de compensacao respiratorio (PCR) (inicio a 70 W e incrementos de 17,5 W a cada 2 minutos) e um teste de lactato minimo (inducao com Wingate, fase incremental iniciado a 30 W abaixo do PCR e incrementos de 10 W a cada 3 minutos) em cicloergometro. A iLACmin foi determinada utilizando aj