title: Maximal lactate steady state concentration independent of pedal cadence in active individuals.
abstract: The maximal lactate steady state (MLSS) is defined as the highest blood lactate concentration that can be maintained over time without a continual blood lactate accumulation. The objective of the present study was to analyze the effects of pedal cadence (50 vs. 100 rev min(-1)) on MLSS and the exercise workload at MLSS (MLSS(workload)) during cycling. Nine recreationally active males (20.9+/-2.9 years, 73.9+/-6.5 kg, 1.79+/-0.09 m) performed an incremental maximal load test (50 and 100 rev min(-1)) to determine anaerobic threshold (AT) and peak workload (PW), and between two and four constant submaximal load tests (50 and 100 rev min(-1)) on a mechanically braked cycle ergometer to determine MLSS(workload) and MLSS. MLSS(workload) was defined as the highest workload at which blood lactate concentration did not increase by more than 1 mM between minutes 10 and 30 of the constant workload. The maximal lactate steady state intensity (MLSS(intensity)) was defined as the ratio between MLSS(workload) and PW. MLSS(workload) (186.1+/-21.2 W vs. 148.2+/-15.5 W) and MLSS(intensity) (70.5+/-5.7% vs. 61.4+/-5.1%) were significantly higher during cycling at 50 rev min(-1) than at 100 rev min(-1), respectively. However, there was no significant difference in MLSS between 50 rev min(-1) (4.8+/-1.6 mM) and 100 rev min(-1) (4.7+/-0.8 mM). We conclude that MLSS(workload) and MLSS(intensity) are dependent on pedal cadence (50 vs. 100 rev min(-1)) in recreationally active individuals. However, this study showed that MLSS is not influenced by the different pedal cadences analyzed.
authors.affiliation: Laboratório de Avaliação da Performance Humana, UNESP, Av. 24 A, 1515 Bela Vista, CEP 13506-900, Rio Claro, SP, Brazil. bdenadai@rc.unesp.br
authors.forename: Benedito Sérgio
authors.initials: BS
authors.lastname: Denadai
authors.forename: Vinícius Daniel de Araújo
authors.initials: VD
authors.lastname: Ruas
authors.forename: Tiago Rezende
authors.initials: TR
authors.lastname: Figueira
mesh_terms: D001642:Bicycling; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D010807:Physical Endurance
chemical_list: D019344:Lactic Acid