5/15/2023 0 Comments Goldencheetah dbAnd second, the tissue oxygen reserve represented in SmO2, when calculated as an integral corresponds to W’. During these tests, performance and SmO2 essentially mirror each other, and both CP and W’ generate solid correlation with what would be deemed their SmO2 counterparts: first, the steady-state of SmO2 correlates with CP. Empirically, exploratory data quickly illustrates the relationship between performance and SmO2, as shown during 3-min all-out cycling tests to assess CP. SmO2 presents a steady-state in oxygen supply and demand and thereby represents CP specifically at a local level of analysis. And second, work capacity above CP named W’. Conceptually, the CP model provides two components: first CP is defined as the highest metabolic rate that can be achieved through oxidative means. The rapid development of near-infrared spectroscopy (NIRS) to measure muscle oxygenation (SmO2) dynamics provides a physiological exploration of the CP model on a conceptual and empirical level. ![]() However, CP presents physiological inconsistencies and process-oriented problems. pedaling at a specific power output on an ergometer the model precisely calculates the time over which an athlete can sustain this power. The CP model, when applied properly, has great predictive power, e.g. The power-duration relationship is well documented for athletic performance and is formulated out mathematically in the critical power (CP) model. This is the intensity for which the athlete can sustain 1 h of exercise under quasi-steady state conditions without fatiguing. Furthermore, the MMSS was defined at 27% SmO2, where a non-steady state begins during exercise in trained cyclists.Ī new indicator has been provided for trained cyclists, < 27% SmO2 as a cut-off to define the MMSS Zone. ![]() Likewise, after passing FTP and RCP, performance is dependent on better muscle oxygen extraction. In addition, power output%, heart rate%, VO2%, carbohydrate and fat consumption to cutoff SmO2 point relative to MMSS were obtained.Ī greater SmO2 decrease was found in cyclists with > 55 VO2max (元, L4 and L5) vs. Then, metabolic thresholds were determined: Fatmax zone, functional threshold power (FTP), respiratory compensation point (RCP), and maximal aerobic power (MAP). Subjects were classified by VO2max levels with a scale from 2 to 5: L2 = 45–54.9, 元 = 55–64.9, L4 = 65–71, L5 = > 71, which represent recreationally trained, trained, well-trained, and professional, respectively. SmO2 was measured with a portable NIRS placed on the vastus lateralis. The objective of this study is to delimit metabolic thresholds relative to maximal metabolic steady state (MMSS) using SmO2 in cyclists.įorty-eight cyclists performed a graded incremental test (GTX) (100 W-warm-up followed by 30 W min) until exhaustion. Near-infrared spectroscopy (NIRS) sensors measure muscle oxygen saturation (SmO2) as a performance factor in endurance athletes.
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