Validity and reliability of the Hexoskin(R) wearable biometric vest during maximal aerobic power testing in elite cyclists.Elliot, Catherine A. PhD; Hamlin, Michael J. PhD; Lizamore, Catherine A. PhDJournal of Strength & Conditioning Research: Post Acceptance: July 28, 2017 doi: 10.1519/JSC.0000000000002005 Original Research: PDF Only Abstract The purpose of this study was to investigate the validity and reliability of the Hexoskin(R) vest for measuring respiration and heart rate (HR) in elite cyclists during a progressive test to exhaustion. Ten male elite cyclists (age 28.8 +/- 12.5 yr, height 179.3 +/- 6.0 cm, weight 73.2 +/- 9.1 kg, V[spacing dot above] O2max 60.7 +/- 7.8 ml.kg.min-1, mean +/- SD) conducted a maximal aerobic cycle ergometer test using a ramped protocol (starting at 100W with 25W increments each min to failure) during two separate occasions over a 3-4 day period. Compared to the criterion measure (Metamax 3B) the Hexoskin(R) vest showed mainly small typical errors (1.3-6.2%) for HR and breathing frequency (f), but larger typical errors (9.5-19.6%) for minute ventilation (V[spacing dot above]E) during the progressive test to exhaustion. The typical error indicating the reliability of the Hexoskin(R) vest at moderate intensity exercise between tests was small for HR (2.6-2.9%) and f (2.5-3.2%) but slightly larger for V[spacing dot above]E (5.3-7.9%). We conclude that the Hexoskin(R) vest is sufficiently valid and reliable for measurements of HR and f in elite athletes during high intensity cycling but the calculated V[spacing dot above]E value the Hexoskin(R) vest produces during such exercise should be used with caution due to the lower validity and reliability of this variable. Copyright (C) 2017 by the National Strength & Conditioning Association.