Using a Portable Near-infrared Spectroscopy Device to Estimate The Second Ventilatory Threshold

Abstract A breakpoint in a portable near-infrared spectroscopy (NIRS) derived deoxygenated haemoglobin (deoxy[Hb]) signal during an incremental VO2max running test has been associated with the second ventilatory threshold (VT2) healthy participants. Thus, aim was to examine association between this and VT2 well-trained runners. Gas exchange NIRS data were collected for 10 The calculated oxygen saturation (StO2) determined compared terms relative %VO2max, absolute speed, VO2, maximum heart rate (HRmax). There no significant differences (p>0.05) StO2 %VO2max (87.00±6.14 88.28 ± 3.98 %), speed (15.70±1.42 16.10±1.66 km·h−1), VO2 (53.71±15.17 54.66±15.57 ml·kg−1·min−1), and%HRmax (90.90±4.17 91.84±3.70%). large correlations instruments to%VO2max (r=0.68, p<0.05), (r=0.86, p<0.001), %HRmax (r=0.69; p<0.05). Bland Altman analysis of agreement resulted mean difference − 1.27±4.49%, −0.40±0.84 km·h−1,−0.90±3.07 ml·kg−1·min−1, 0.94±3.14 %HRmax, respectively. We conclude that determination is comparable using gas therefore appropriate use determining exercise training above intensity. This first study analyze validity mode device.