Samantha Fawkner

Towards the minimal amount of exercise for improving metabolic health: beneficial effects of reduced-exertion high-intensity interval training.

High-intensity interval training (HIT) has been proposed as a time-efficient alternative to traditional cardiorespiratory exercise training, but is very fatiguing. In this study, we investigated the effects of a reduced-exertion HIT (REHIT) exercise intervention on insulin sensitivity and aerobic capacity. Twenty-nine healthy but sedentary young men and women were randomly assigned to the REHIT intervention (men, nxa0=xa07; women, nxa0=xa08) or a control group (men, nxa0=xa06; women, nxa0=xa08). Subjects assigned to the control groups maintained their normal sedentary lifestyle, whilst subjects in the training groups completed three exercise sessions per week for 6xa0weeks. The 10-min exercise sessions consisted of low-intensity cycling (60xa0W) and one (first session) or two (all other sessions) brief ‘all-out’ sprints (10xa0s in week 1, 15xa0s in weeks 2–3 and 20xa0s in the final 3xa0weeks). Aerobic capacity (

Reliability of heart rate variability measures at rest and during light exercise in children

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Effect of ischemic preconditioning on repeated sprint ability in team sport athletes

) and the glucose and insulin response to a 75-g glucose load (OGTT) were determined before and 3xa0days after the exercise program. Despite relatively low ratings of perceived exertion (RPE 13xa0±xa01), insulin sensitivity significantly increased by 28% in the male training group following the REHIT intervention (Pxa0<xa00.05).

‘Once upon a time I used to be active’. Adopting a narrative approach to understanding physical activity behaviour in adolescent girls

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‘It’s too crowded’ A qualitative study of the physical environment factors that adolescent girls perceive to be important and influential on their PE experience

increased in the male training (+15%) and female training (+12%) groups (Pxa0<xa00.01). In conclusion we show that a novel, feasible exercise intervention can improve metabolic health and aerobic capacity. REHIT may offer a genuinely time-efficient alternative to HIT and conventional cardiorespiratory exercise training for improving risk factors of T2D.

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The literature suggests that the oxygen uptake ( V O 2 ) response to the onset of moderate-intensity exercise may be both mature from childhood and independent of sex. Yet the cardiorespiratory response to exercise and the metabolic profile of the muscle appear to change with growth and deve . lopment and to differ between the sexes. The aim of this study was to investigate further changes in the V O2 kinetic response with age and sex. Participants completed a series of no less than four step change transitions, from unloaded pedalling to a constant work rate corresponding to 80% of their previously determined ventilatory threshold. Each participants breath-by-breath responses were interpolated to 1 s intervals, time aligned and then averaged. A single exponential model that included a time delay was used to analyse the averaged response following phase 1 (15 s). Participants with parameter confidence intervals more than - 5 s were removed from the sample; the results for the remaining 13 men and 12 women (age 19-26 years), 12 boys and 11 girls (age 11-12 years) were used for statistical analysis. Children had a significantly shorter time constant than adults, both for males (19.0 - 2.0 and 27.9 - 8.6 s respectively; P ≪ 0.01) and females (21.0 - 5.5 and 26.0 - 4.5 s respectively; P ≪ 0.05). There were no significant differences in the time constant between the sexes for either adults or children ( P > 0.05). A significant relationship between the time constant and peak V O 2 was found only in adult males ( P ≪ 0.05). A shorter time constant in children may reflect an enhanced potential for oxidative metabolism.