摘要：O estudo objetivou determinar o limiar anaeróbio (LAn) em teste progressivo de natação e corrida para ratos, por dois métodos matemáticos: concentração fixa de lactato e bissegmentação da curva lactacidêmica. Foram avaliados 19 ratos nadadores e 29 corredores, submetidos a protocolos progressivos com estágios de 5 minutos e coletas de sangue ao final dos estágios. O LAn foi obtido por dois métodos: ajuste exponencial e determinação por concentração fixa de lactato (4,0; 4,5, 5,0 e 5,5mmol/L) e inspeção visual da inflexão da curva lactacidêmica, seguida por bissegmentação das retas de regressão. As intensidades obtidas foram comparadas por ANOVA one-way (P
其他摘要：The study aimed to determine the anaerobic threshold (AT) with incremental test in swimming and running rats, using two mathematical methods for analysis: fixed blood lactate concentration and visual inspection of inflection point preceded by bi-segmental linear regression. Swimming (n=19) and running rats (n=29) were used. The incremental test was composed by 5 minutes of exercise with blood collection after loads for lactate concentration determination. The AT was determined by fixed lactate concentration (4.0; 4.5;5.0; 5.0mmol/L) and the visual inspection of inflection point of the lactate curve, preceded by intersection of the bi-segmental linear regression. The AT intensities were compared by one-way Anova. In swimming rats the best analysis for AT determination seems to be fixed blood lactate in concentrations (5.0 and 5.5mmol/L, load=4.2±0.1%bw). In treadmill running, the bi-segmental linear regression was possible with 67.2% of animals (AT=21.1±0.9 m/min) and this method seems to be the adequate for running rats.
关键词：Teste progressivo; Limar anaeróbio; Ratos;Limiar anaeróbio; teste progressivo; ratos
