Copyright @ 200 by the American College of Sports Medicine. Unauthorized reproduction of this article is prohibited.8 Revisiting ‘‘How Many Steps Are Enough?’’

TUDOR-LOCKE, C., Y. HATANO, R. P. PANGRAZI, and M. KANG. Revisiting ‘‘How Many Steps Are Enough?’ ’ Med. Sci. Sports Exerc., Vol. 40, No. 7S, pp. S537–S543, 2008. With continued widespread acceptance of pedometers by both researchers and practitioners, evidence-based steps/day indices are needed to facilitate measurement and motivation applications of physical activity (PA) in public health. Therefore, the purpose of this article is to reprise, update, and extend the current understanding of dose–response relationships in terms of pedometer-determined PA. Any pedometer-based PA guideline presumes an accurate and standardized measure of steps; at this time, industry standards establishing quality control of instrumentation is limited to Japan where public health pedometer applications and the 10,000 stepsIdj1 slogan are traceable to the 1960s. Adult public health guidelines promote Q30 min of at least moderate-intensity daily PA, and this translates to 3000–4000 steps if they are: 1) at least moderate intensity (i.e., Q100 stepsIminj1); 2) accumulated in at least 10-min bouts; and 3) taken over and above some minimal level of PA (i.e., number of daily steps) below which individuals might be classified as sedentary. A zone-based hierarchy is useful for both measurement and motivation purposes in adults: 1) G5000 stepsIdj1 (sedentary); 2) 5000–7499 stepsIdj1 (low active); 3) 7500–9999 stepsIdj1 (somewhat active); 4) Q10,000–12,499 stepsIdj1 (active); and 5) Q12,500 stepsIdj1 (highly active). Evidence to support youth-specific cutoff points is emerging. Criterion-referenced approaches based on selected health outcomes present the potential for advancing evidence-based steps/day standards in both adults and children from a measurement perspective. A tradeoff that needs to be acknowledged an