International Journal of Sports Medicine

The aim was to examine the association between this breakpoint (NIRS) and VT2 in welltrained runners.Gas exchange and NIRS data were collected during an incremental VO2max running test for 10 well-trained runners.The breakpoint calculated in oxygen saturation (StO2) and the VT2 were determined and compared in terms relative to %VO2max, absolute speed, VO2 and maximum heart rate (HRmax).There were no significant differences (p>0.05) between the breakpoint in StO2 and VT2 relative to %VO2max (87.00±6.14 and 88.28±3.98 %), absolute speed (15.70±1.42 and 16.10±1.66km•h -1 ), VO2 (53.71±15.17and 54.66±15.57ml•kg -1 •min -1 ) and %HRmax (90.90± 4.17 and 91.84 ± 3.70 %).There were large and significant correlations between instruments relative to %VO2max (r=0.68,p