Fig. 2
The partial correlations between VO2peak and vector magnitude during the last 30 s of the test when the smartphone was placed in the lower position, smartphone placement in the right side pocket of the pants (Panel a) and in upper position, smartphone placement in the right side pocket of the jacket (Panel b). The dotted line is the best fit line. Triangles (▲) represent observations during the test with encouragement and crosses (X) are observations during the test without encouragement. The grey shaded area is the 95 % confidence interval