{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T04:08:18Z","timestamp":1790482098527,"version":"4.1.0"},"reference-count":42,"publisher":"Human Kinetics","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,4,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> To assess the concurrent validity of a continuous blood-glucose-monitoring system (CGM) postbreakfast, preexercise, exercise, and postexercise, while assessing the impact of 2 different breakfasts on the observed level of validity. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Eight nondiabetic recreational athletes (age\u2009=\u200930.8 [9.5]\u00a0y; height\u2009=\u2009173.6 [6.6]\u00a0cm; body mass\u2009=\u200970.3 [8.1]\u00a0kg) took part in the study. Blood glucose concentration was monitored every 10 minutes using both a CGM (FreeStyle Libre, Abbott, France) and finger-prick blood glucose measurements (FreeStyle Optimum) over 4 different periods (postbreakfast, preexercise, exercise, and postexercise). Two different breakfasts (carbohydrates [CHO] and protein oriented) over 2 days (2\u2009\u00d7\u20092 d in total) were used. Statistical analyses included the Bland\u2013Altman method, standardized mean bias (expressed in standardized units), median absolute relative difference, and the Clarke error grid analysis. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Overall, mean bias was trivial to small at postbreakfast (effect size\u2009\u00b1\u200990% confidence limits: \u22120.12\u2009\u00b1\u20090.08), preexercise (\u22120.08\u2009\u00b1\u20090.08), and postexercise (0.25\u2009\u00b1\u20090.14), while moderate during exercise (0.66\u2009\u00b1\u20090.09). A higher median absolute relative difference was observed during exercise (13.6% vs 7%\u20139.5% for the other conditions). While there was no effect of the breakfast type on the median absolute relative difference results, error grid analysis revealed a higher value in zone D (ie,\u00a0clinically unsafe zone) during exercise for CHO (10.5%) compared with protein (1.6%). <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> The CGM device examined in this study can only be validly used at rest, after both a CHO and protein-rich breakfast. Using CGM to monitor blood glucose concentration during exercise is not recommended. Moreover, the accuracy decreased when CHO were consumed before exercise.<\/jats:p>","DOI":"10.1123\/ijspp.2021-0222","type":"journal-article","created":{"date-parts":[[2022,2,21]],"date-time":"2022-02-21T11:18:25Z","timestamp":1645442305000},"page":"627-633","source":"Crossref","is-referenced-by-count":21,"title":["Concurrent Validity of a Continuous Glucose-Monitoring System at Rest and During and Following a High-Intensity Interval Training 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