Table 2.
Perceived exertion, heart rate, measured energy expenditure, and error rates of the Polar Vantage M when compared with the MetaMax 3B.
| Activity | Borg scale (6-20), mean (SD) | % HRmaxa | EEb by MetaMax 3B (kcal), mean (SD) | EE by Polar Vantage M (kcal), mean (SD) | Systematic bias in kcal, (limits of agreement) | Mean absolute error in kcal, (mean absolute percentage error) | 20% accuracyc, n/N (%) |
| All activities | 10.9 (3.5) | 59.6 | 69.1 (42.7) | 71.4 (37.8) | 2.3 (37.8) | 14.0 (20.6) | 123/208 (59.1) |
| Sitting and reading | 6.1 (0.3) | 34.0 | 13.7 (2.5) | 13.6 (2.1) | −0.1 (3.1) | 1.2 (9.1) | 28/30 (93) |
| Household chores | 7.6 (1.0) | 45.7 | 39.1 (8.6) | 50.1 (10.6) | 11.0 (16.5) | 11.8 (31.4) | 8/30 (27) |
| Walking (5.4 [0.5] km/h) | 8.5 (0.9) | 46.3 | 43.4 (6.8) | 52.3 (8.5) | 9.0 (12.3) | 9.0 (21.4) | 15/30 (50) |
| Jogging (9.6 [1.2] km/h) | 11.8 (1.0) | 71.4 | 113.7 (26.7) | 103.3 (21.5) | −10.4 (33.5) | 16.9 (14.8) | 21/30 (70) |
| Strength training circuit (5.1 [2.8] kg) | 13.5 (0.9) | 63.3 | 61.8 (16.9) | 71.0 (18.5) | 9.2 (29.7) | 14.3 (25.2) | 15/30 (50) |
| Cycling (130.7 [22.6] W) | 14.1 (1.1) | 72.9 | 90.2 (15.5) | 102.0 (24.9) | 11.8 (34.9) | 18.0 (20.6) | 20/30 (66.7) |
| Floorball course | 15.1 (1.7) | 83.4 | 125.5 (36.1) | 110.1 (29.3) | −15.4 (63.0) | 27.5 (21.8) | 16/28 (57.1) |
a%HRmax=percentage of maximal heart rate.
bEE: energy expenditure.
cPercentage at which the EE estimated by the Polar Vantage M was within 20% from the criterion MetaMax 3B.