Figure 3. Linear regressions (r, p and SEE) from the relations VO= f (V) and VO= f (HR) on the pooled data of the group 1 (walking with or without load during 3 min, 20 walks), the group 2 (walking with or without load during 6 min, 26 walks), the group 3 (walking with or without load during 1 min, 22 walks) and the group 4 (intermittent work, 12 exercises).