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Peak oxygen uptake (˙VO2peak) is an important factorcontributing to running performance. Wearable technology may allow theassessment of ˙VO2peak more frequently and on a larger scale.We aim to i) validate the ˙VO2peak assessed by a smartwatch(Garmin Forerunner 245), and ii) discuss how this parameter may assist toevaluate and guide training procedures. A total of 23 runners (12 female, 11male; ˙VO2peak:48.6±6.8 ml∙min−1∙kg−1)visited the laboratory twice to determine their ˙VO2peakduring a treadmill ramp test. Between laboratory visits, participants wore asmartwatch and performed three outdoor runs to obtain˙VO2peak values provided by the smartwatch. The˙VO2peak obtained by the criterion measure ranged from 38to61 ml∙min−1∙kg−1.The mean absolute percentage error (MAPE) between the smartwatch and thecriterion ˙VO2peak was 5.7%. The criterion measurerevealed a coefficient of variation of 4.0% over the VO2peak range from38–61 ml∙min−1∙kg−1.MAPE between the smartwatch and criterion measure was 7.1, 4.1 and−6.2% when analyzing ˙VO2peak ranging from39–45 ml∙min−1∙kg−1,45–55 ml∙min−1∙kg−1or55–61 ml∙min−1∙kg−1,respectively.

Assessment of Peak Oxygen Uptake with a Smartwatch and its Usefulness for Training of Runners