Table 1. Intraclass Correlation Coefficient and the mean absolute percentage error comparing different methodologies assessing V̇O_2max

	Intraclass Correlation Coefficient [95% CI]; “Interpretation”	Mean Absolute Percentage Error [%]
Smartwatch Run 1 vs. respiratory gas analysis	0.37 [-0.25; 0.71]; “poor”	5.58
Smartwach Run 2 vs. respiratory gas analysis	0.54 [-0.3; 8.4]; “moderate”	1.06
YoYo Intermittent Recovery Test 2 vs. respiratory gas analysis	0.17 [-5.7; 0.6]; “poor”	4.2