Test-Retest Reliability of the Microvascular Oxygenation Recovery Response Subsequent to Submaximal Cycling Exercise

Main Article Content

Trent E. Cayot
Alicia M. Otto
Alex Sikora
Alexandria C. Frick
Nathanial R. Eckert
Stacey L. Gaven

Keywords

Near-Infrared Spectroscopy, Performance Assessment, Curve Fitting Analysis

Abstract

Introduction: The purpose was to quantify the within-session and between-session reliability of halftime (HT) and monoexponential curve fitting (EXP) analyses, when assessing the microvascular tissue oxygenation (StO2) recovery response via near-infrared spectroscopy (NIRS).  


Methods:  Seventeen subjects completed a submaximal cycling test and 6-minute cool-down on three occasions. The protocol was completed twice during session 1 and once during session 2. StO2 were collected via NIRS from a randomized vastus lateralis. StO2 response from the last minute of exercise and the entire cool-down was analyzed using HT and EXP. Within-session and between-session reliability were examined by mixed, absolute agreement intraclass correlation coefficients (ICC) and standard error of the measurement (SEM).


Results: HT resulted in higher within-session reliability compared to EXP for exercising StO2 (ICCHT=0.920, ICCEXP=0.865, SEMHT=4.9 ∆BSL, SEMEXP=6.2 ∆BSL) and StO2 recovery time (ICCHT=0.772, ICCEXP=0.720, SEMHT=7 sec, SEMEXP=9 sec). Similar between-session reliability for exercising StO2 was observed (ICCHT=0.895, ICCEXP=0.879, SEMHT=5.2 ∆BSL, SEMEXP=5.4 ∆BSL), however HT elicited higher between-session reliability for StO2 recovery time (ICCHT=0.583, ICCEXP=-0.211, SEMHT=7 sec, SEMEXP=15 sec). 


Conclusions: Due to the better within-session (exercising StO2, StO2 recovery time) and between-session (StO2 recovery time) reliability, practitioners are encouraged to use HT when assessing exercising StO2 and StO2 recovery time.

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