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Evaluation of the role of physical activity levels on the release of appetite-related hormones after preloads with a different energy content

Bøhler, Linn
Master thesis
Åpne
Masterthesis_LinnBøhler.pdf (Låst)
Permanent lenke
http://hdl.handle.net/11250/281711
Utgivelsesdato
2014
Metadata
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Samlinger
  • Institutt for klinisk og molekylær medisin [2113]
Sammendrag
Background:Previous research has shown that regular exercisers are able to adjust their

energy intake after preloads of different energy content, while inactive individuals are not.

However, the mechanisms responsible for the better short-term appetite control in active

individuals remain unknown.

Purpose: The aim of this study was to look at differences in the release of the appetite

hormones in response to preloads of different energy content between active and inactive

individuals.

Material and Methods: Crossover study with 16 healthy male participants (9 active, 7

inactive), normal- to slightly overweight (BMI 18.5-27 kg/m

2

) aged 18-50 years. Participants

were given a high- (HEP) or a low-energy preload (LEP) for breakfast, in random order, with

a wash out period of at least two days and subjective feelings of appetite and the release of

appetite-related hormones (active GLP-1, insulin, total PYY and active ghrelin) were

measured in response to the intake of both preloads for a period of 2,5 hours.

Results: A statistically significant main effect of preload (P<0.001), and physical activity

(PA)(P<0.01) and a preload*PA interaction (P<0.001) were found on total area under the

curve (tAUC) for insulin plasma levels, with higher insulin levels after the HEP and in

inactive participants overall. There was a significant difference between groups for tAUC

insulin HEP (P<0.001) but not for LEP, and the difference between preloads was significantly

larger in the inactive group (P<0.01). No statistically significant main effects of preload, or

PA, or interaction were found for tAUC for total PYY, active ghrelin, or active GLP-1, or

subjective feelings of appetite, but active GLP-1 fasting levels were higher in inactive versus

active individuals (P<0.05 for HEP and P=0.055 for LEP day).

Conclusion: PA seems to modulate the postprandial release of insulin (but not other

hormones) after the intake of preloads of different energy content and that may contribute, at

least partially, to the differences in short-term appetite control between active and inactive

individuals. However, more studies, with larger sample sizes, are needed.
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