Abstract
Research has identified the lactate threshold (LaT) as a measurement of exercise intensity. Muscle tissue oxygen saturation has been observed non-invasively by near infrared spectroscopy (NIRS). PURPOSE The purpose of this study is to examine associations between the heart rate threshold (HRT), LaT, and percent muscle tissue saturation threshold (StO2T) during exercise in females. METHODS Subjects were eighteen (18) elite female cyclists. Each performed a maximal cycle test to volitional fatigue. Venous blood lactate (mM), heart rate (bpm) and StO2(%) were collected and averaged every minute. Thresholds were identified utilizing a logarithmic transformation of data as the point of disproportionate variable rate change. Correlation coefficients were determined to recognize associations between variable thresholds. Statistical significance was set a p ≤ 0.05. RESULTS Significant associations were established between the following: HRT vs. StO2T (r = 0.50, p = 0.04); LaT vs. StO2T (r = 0.68, p = 0.002); HRT vs. LaT (r = 0.82, p = 0.001). CONCLUSIONS Thresholds for muscle tissue oxygen saturation, heart rate and lactate show associations in elite female cyclists. In addition, HRT is significantly associated with LaT. Therefore, StO2T and HRT may provide non-invasive procedures for determination of the LaT. Supported by Baylor URC grant 016-A02
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