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Fig. 2 | BMC Medical Research Methodology

Fig. 2

From: Methodological aspects for accelerometer-based assessment of physical activity in heart failure and health

Fig. 2

Cardiorespiratory response in % of \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\) to exercising at 2, 3, and 6 METs across the age spectrum (20 to 91 years) for patients with heart failure (HEART) and healthy individuals (HEALTH). The age of all participants is displayed on the x-axes. The relative intensity in % of the subjects’ \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\) that would be required to exercise at the three absolute intensities (2, 3, and 6 METs) is depicted on the y-axes. Intensity categories are marked by the dashed lines. LPA is defined as 0 to < 46% of \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\), MPA as 46 to < 64% of \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\), and VPA as 64 to 100% of \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\).2 The hatched area symbolized the intensity that cannot be maintained for a prolonged time, as it exceeds the individual’s cardiorespiratory fitness. Abbreviations: LPA, light physical activity; MPA, moderate physical activity; VPA, vigorous physical activity; \(\overset{.}{\mathrm{V}}\mathrm{O}_{2\text{peak}}\), peak oxygen uptake

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