Purpose: This study aimed at comparing previous calculating formulas of maximal lactate accumulation rate (vLa.max) and a modified formula of pure vLa.max (PvLa.max) during a 15-s all-out sprint cycling test (ASCT) to analyze their relationships. Methods: Thirty male national-level track cyclists participated in this study (n = 30) and performed a 15-s ASCT. The anaerobic power output (Wpeak and Wmean), oxygen uptake, and blood lactate concentrations (La-) were measured. These parameters were used for different calculations of vLa.max and three energy contributions (phosphagen, WPCr; glycolytic, WGly; and oxidative, WOxi). The PvLa.max calculation considered delta La-, time until Wpeak (tPCr-peak), and the time contributed by the oxidative system (tOxi). Other vLa.max levels without tOxi were calculated using decreasing time by 3.5% from Wpeak (tPCr -3.5%) and tPCr-peak. Results: The absolute and relative WPCr were higher than WGly and WOxi (p < 0.0001, respectively), and the absolute and relative WGly were significantly higher than WOxi (p < 0.0001, respectively); vLa.max (tPCr -3.5%) was significantly higher than PvLa.max and vLa.max (tPCr-peak), while vLa.max (tPCr-peak) was lower than PvLa.max (p < 0.0001, respectively). PvLa.max and vLa.max (tPCr-peak) were highly correlated (r = 0.99; R2 = 0.98). This correlation was higher than the relationship between PvLa.max and vLa.max (tPCr -3.5%) (r = 0.87; R2 = 0.77). vLa.max (tPCr-peak), PvLa.max, and vLa.max (tPCr -3.5%) were found to correlate with absolute Wmean and WGly. Conclusion: PvLa.max as a modified calculation of vLa.max provides more detailed insights into the inter-individual differences in energy and glycolytic metabolism than vLa.max (tPCr-peak) and vLa.max (tPCr -3.5%). Because WOxi and WPCr can differ remarkably between athletes, implementing their values in PvLa.max can establish more optimized individual profiling for elite track cyclists.
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