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This study was designed to investigate the efficacy of the near-infrared spectroscopy (NIRS) methodology in exploring the relationship between ventilatory (VT) and NIRS-determined threshold on the gastrocnemius muscle during running. Seventeen healthy participants, 11 males and 6 females performed an incremental exercise test until volitional exhaustion on a treadmill. Initial speed was set at 8 km/h with increments of 0.5 km/h per minute. Tissue oxygen saturation (StO2) was obtained from the belly of the left gastrocnemius muscle. Running velocity at the NIRS threshold was evaluated with StO2-velocity plots, employing two different models: linear (NTlin) and Dmax (NTD). Significant difference in velocity was observed between NTD (11.7 ± 0.9 km/h) and VT (11.2 ± 1.2 km/h). However, no difference in velocity was observed between VT and NTlin (11.6 ± 0.8 km/h, p > 0.05), and between the two NIRS methods (p > 0.05). VT velocity was significantly correlated (p 0.05). Furthermore, small but significant differences (p |
