Effect of exercise intensity on post-exercise substrate utilisation

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Author
Nott, Benjamin
Date
2015Type
Thesis
Publisher
Cardiff Metropolitan University
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Show full item recordAbstract
A negative or neutral energy balance (EB) is essential for weight loss or
maintenance, and post exercise (EE) energy expenditure (EE) is a significant
contributor to total EE and therefore EB. Post-exercise (PE) substrate utilisation is
also important to health, therefore we examined the effects of exercise intensity on
the quantity and direction of PE EE in healthy men (n=5; age=20 ±1yr) and women
(n=5; age 21±2yr). One continuous (30 mins @ 70% VO2max) and one interval
(4x4min @85% VO2max separated with 3min active recovery @ 50% VO2max)
exercise sessions that were match for total EE were performed and respiratory gas
analysis was take for 1hr of PE recovery. Average HR and VO2 were not significantly
(p>0.05) different during exercise and peak HR and VO2 were significantly (p<0.05)
higher during the interval session compared to the continuous session. RER was
significantly (p<0.05) lower during PE recovery after interval compared to continuous
exercise (0.75±0.03 vs 0.78±0.04). The contribution of fat to total EE was higher
during PE recovery compared to pre-exercise rest (81.5±4% vs 48±8%) and the
interval exercise induced a greater metabolism of fat during PE recovery compared
to continuous exercise (53.5 ± 7.2 vs 48.8 ± 6.1 KCal). It is concluded that achieving
higher intensities increases the contribution of fat to PE substrate oxidation, which is
an important benefit to health and fat mass control control.
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