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de Vries, S.I. (author), Hopman-Rock, M. (author), Bakker, I. (author), van Mechelen, W. (author), TNO Kwaliteit van Leven (author)Purpose: To investigate the effect of guideline operationalization in terms of intensity threshold, bout duration, and days on the proportion of children meeting the health-related 60-min physical activity guideline using a subjective and an objective assessment method. Methods: Five hundred and twenty-one children (6-11 yr) completed a physical...article 2009