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Skin temperature thresholds: A novel non-invasive potential tool for estimating ventilatory thresholds
Xianxiang Zeng1, Chunxue Tang1, Yuxiao Deng1
1Department of Exercise Physiology, Beijing Sport University, Beijing, China.
Background:
Developing non-invasive, practical methods to identify exercise metabolic thresholds remains a key focus in exercise physiology. This study examined the variation patterns of average skin temperature (aTsk) measured by infrared thermography during a ramp incremental exercise test (RIET) and determined skin temperature thresholds (TSKTs) to assess their agreement with ventilatory thresholds (VTs).
Methods:
Twenty-three active college students performed a RIET. Physiological parameters including aTsk, oxygen uptake (V˙O2), heart rate (HR), and power output (PO), were recorded. Paired-sample t-tests, Pearson correlation (r), Intraclass Correlation Coefficient (ICC) and Bland-Altman were used to assess the agreement between TSKTs and VTs. The TSKTs comprised the first (TSKT1) and second (TSKT2) skin temperature thresholds.
Results:
1) aTsk remained stable initially, then declined (TSKT1), and finally slowed or rebounded (TSKT2). 2) No significant differences were observed between VTs and TSKTs in V˙O2, HR, or PO (P > 0.05). 3) At the levels of absolute V˙O2 (V˙O2ab), relative V˙O2 (V˙O2re), HR and PO, TSKT1 exhibited moderate agreement with VT1, with ICC (0.587, 0.432, 0.430 and 0.525) and r > 0.40 (P < 0.05). TSKT2 showed moderate to high agreement with VT2 for V˙O2ab (ICC: 0.774, r: 0.778) (P < 0.01), V˙O2 re (ICC: 0.433, r: 0.449) (P < 0.05), and PO (ICC: 0.770, r: 0.784) (P < 0.01), while no significant agreement and correlation was found for HR (P > 0.05).
Conclusion:
TSKTs identified during RIET exhibited moderate to high reliability in estimating VTs and may serve as a potential tool for VTs assessment.
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