Abstract

RUAS, VDA et al. Effects of Pedaling Cadence on the Relationship Between Anaerobic Threshold and Maximal Lactate Steady State in Active Male Individuals. Rev. Port. Cien. Desp. [online]. 2006, vol.6, n.1, pp.15-20. ISSN 1645-0523.

The aim of the present study was to analyse the influence of pedaling cadence on the validity of anaerobic threshold (AT) to estimate the exercise workload corresponding to the maximal lactate steady state (MLSS_workload) during cycle ergometer. Twenty-eight active male (21.7 + 3.5 yr, 72.7 + 10.1 kg, 177.0 + 4.5 cm) performed one incremental maximal-load test to determine AT and two to four constant submaximal load tests on a mechanically braked cycle ergometer to determine MLSS_workload. The tests were performed at pedal cadences of 50, 60, 70 and 100 rpm. AT was determined as the workload corresponding to 3.5 mM of blood lactate. The MLSS_workload was defined as the highest workload at which blood lactate concentration did not increase by more than 1.0 mM between minutes 10 and 30 of the constant workload. There was no significant difference between MLSS_workload (50 rpm = 187.1 + 26.7; 60rpm = 182.8 + 31.0; 70 rpm = 180.2 + 24.5 and; 100 rpm = 154.5 + 24.8 Watts and AT (50 rpm = 189.8 + 31.5; 60rpm = 175.2 + 37.8; 70 rpm = 187.2 + 28.0 and; 100 rpm = 142.9 + 23.9 Watts. With exception of cadence at 100 rpm (r = 0.59; p > 0.05), AT was significantly correlated with MLSS_workload (50 rpm - r = 0.80; 60 rpm - r = 0.96; 70 rpm - r = 0.81). We conclude that at cadences more frequently performed in incremental tests (50 - 70 rpm), AT presented good validity to estimate MLSS_workload in sedentary individuals.

Keywords : aerobic capacity; cycle ergometer; pedaling frequency.

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