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Comparison of the intensity of overall physical activity during school breaks for 9- and 10-year-old overweight and non-overweight boys divided based on the duration of moderate-to-vigorous physical activity during school breaks (Katowice, Poland, 2010). p level of statistical significance (post hoc Scheffe test), maximum heart-rate values were calculated by a simplified age-related Karvonen equation, i.e., 220-age (Edwards 2010)
