A proposal to identify the maximal metabolic steady state by muscle oxygenation and VO2max levels in trained cyclists

Abstract Purpose Near-infrared spectroscopy (NIRS) sensors measure muscle oxygen saturation (SmO 2 ) as a performance factor in endurance athletes. The objective of this study is to delimit metabolic thresholds relative maximal steady state (MMSS) using SmO cyclists. Methods Forty-eight cyclists performed graded incremental test (GTX) (100 W-warm-up followed by 30 W min) until exhaustion. was measured with portable NIRS placed on the vastus lateralis. Subjects were classified VO max levels scale from 5: L2 = 45–54.9, L3 55–64.9, L4 65–71, L5 > 71, which represent recreationally trained, well-trained, and professional, respectively. Then, determined: Fatmax zone, functional threshold power (FTP), respiratory compensation point (RCP), aerobic (MAP). In addition, output%, heart rate%, %, carbohydrate fat consumption cutoff MMSS obtained. Results A greater decrease found 55 (L3, L5) vs. (L2) MMSS. Likewise, after passing FTP RCP, dependent better extraction. Furthermore, defined at 27% , where non-steady begins during exercise trained Conclusion new indicator has been provided for cyclists, < cut-off define Zone. This intensity athlete can sustain 1 h under quasi-steady conditions without fatiguing.