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Objective. Spontaneous and transitory movement patterns are characteristic of children. The aim of this study was to explore the relationship between short, frequent activity bouts and children's health. Methods. Physical activity was recorded every 2 s by accelerometry (ActiGraph GT1M) for seven days in 47 boys (age 8–10 years). Summary activity measures and activity pattern characteristics (frequency, intensity and duration of ≥ 4 s [short] and ≥ 5 min [long] bouts of ≥ light [≥ LIGHT], ≥ moderate [≥ MOD], ≥ vigorous [≥ VIG], and ≥ hard [≥ HARD] intensity activity) were recorded. Microvascular function was assessed using laser Doppler perfusion imaging as the forearm skin blood flow response to the iontophoretic application of acetylcholine (endothelial dependent vasodilator) and sodium nitroprusside (endothelial independent vasodilator) at rest and following maximal exercise. Waist circumference …