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. 2013 Jun 7;8(6):e65302. doi: 10.1371/journal.pone.0065302

Figure 1. Reduction in the risks for incident cardiac arrhythmias per METhr/d for walking and running energy expenditure combined relative to the least active walkers and runners.

Figure 1

Adjustment for BMI and hypertension treatment had little effect on these risk reductions. Energy expenditure (X-axis) is categorized in terms of the upper limit of the minimum recommended physical activity levels (750 MET⋅min/wk = 1.8 METhr/d [10], [18]), e.g., 1 to 2-fold higher activity covers from 1.8 to 3.6 METhr/d, 2- to 3-fold covers from 1.6 to 3.4 METhr/d etc. Error bars represent 95% confidence intervals. Significant levels relative to <1.8 METhr/d coded: * P<0.05; † P<0.01, ‡ P<0.001, and ‡ P<0.0001. The superscript § means that the risk for runners who ran ≥3-fold was significantly less than those who ran <1-fold the recommended level.