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Table 2 Concurrent validity (tested device vs. criterion measure) of the three sports watches

From: Validity of sports watches when estimating energy expenditure during running

  30% vVO2peak 50% vVO2peak 70% vVO2peak 90% vVO2peak 110% vVO2peak
Mean difference [%]
 Suunto Ambit2 38.09 ± 42.06 36.29 ± 20.57 19.16 ± 18.03 −21.62 ± 12.54 −31.85 ± 10.54
 Garmin Forerunner920XT −25.16 ± 16.09 −4.87 ± 29.34 −8.83 ± 10.50 −37.94 ± 8.82 −49.30 ± 9.18
 Polar V800 12.20 ± 21.65 −3.61 ± 15.04 −4.29 ± 12.02 −29.98 ± 9.68 −39.52 ± 8.89
MAE [kcal/min]
 Suunto Ambit2 1.46 2.75 2.32 4.15 7.05
 Garmin Forerunner920XT 1.05 1.28 1.39 6.56 10.40
 Polar V800 0.86 0.89 1.21 5.20 8.37
MAPE [%]
 Suunto Ambit2 41.93 36.30 21.32 23.05 31.85
 Garmin Forerunner920XT 26.28 17.59 11.54 37.94 49.30
 Polar V800 22.76 11.43 10.09 29.98 39.52
RMSE [kcal/min]
 Suunto Ambit2 1.82 3.27 2.74 4.88 7.81
 Garmin Forerunner920XT 1.22 1.98 1.77 7.05 10.81
 Polar V800 0.93 1.26 1.67 5.75 8.81
  1. Results are expressed as mean ± standard deviation
  2. vVO 2peak speed at maximal oxygen uptake, MAE mean absolute error, MAPE mean absolute percentage error, RMSE root mean square error