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Sarah Edmunds, Denise Roche and Gareth Stratton


The current study objectively assessed physical activity (PA) levels and patterns in children and adolescents with type 1 diabetes and compared the metabolic and physiologic health profiles of those achieving and those not achieving the current recommendation of 60 minutes a day (minutes·D−1) of at least moderate intensity PA.


37 children and adolescents (20 boys, 17 girls) aged 12.7 ± 2.1 years (mean ± SD), disease duration 5.9 ± 3.0 years participated. PA was assessed using heart rate monitoring. Peak VO2, BMI, sum of 5 skinfolds, HbA1c, and daily insulin dosage were also determined.


Mean accumulated time in moderate-to-vigorous intensity PA was 53.6 ± 31.4 minutes·D−1. Levels of vigorous-intensity PA were low, mean 8.3 ± 10.2 minutes·D−1. When controlling for age, no differences in metabolic or physiologic health outcomes were evident between those individuals achieving, and those not achieving, 60 minutes·D−1 of moderate-to-vigorous intensity PA. PA predominantly occurred in short bouts lasting 5 minutes or less.


The efficacy of accumulating 60 minutes·D−1 of moderate-to-vigorous intensity PA, in the form of short duration, intermittent bouts of largely unplanned PA, to promote health gains in children and adolescents with type 1 diabetes is questionable.

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Denise M. Roche, Sarah Edmunds, Tim Cable, Mo Didi and Gareth Stratton

No studies to date have evaluated the relationship between exercise and microvascular function in youth with type 1 diabetes mellitus (T1DM). Twenty-nine complication free children and adolescents with T1DM were assessed for skin microvascular reactivity, aerobic fitness (VO2peak) and physical activity. VO2peak but not physical activity was significantly and independently associated with maximal hyperemia of the skin microcirculation (p < .01). No significant associations were found between venoarte-riolar reflex (VAR) vasoconstriction and VO2peak or physical activity. Aerobic fitness may be an important indicator or mediator of effective microvascular endothelial function in youth with T1DM.