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Metabolism and Whole-Body Fat Oxidation Following Post-Exercise Carbohydrate or Protein Intake.

Artikel i vetenskaplig tidskrift
Författare Ulrika Andersson Hall
Stefan Pettersson
Fredrik Edin
Anders Pedersen
Daniel Malmodin
Klavs Madsen
Publicerad i International journal of sport nutrition and exercise metabolism
Sidor 1-25
ISSN 1543-2742
Publiceringsår 2017
Publicerad vid Institutionen för neurovetenskap och fysiologi
Svenskt NMR-centrum vid Göteborgs universitet
Institutionen för kost- och idrottsvetenskap
Sidor 1-25
Språk en
Länkar dx.doi.org/10.1123/ijsnem.2017-0129
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Annan medicin och hälsovetenskap

Sammanfattning

This study investigated how post-exercise intake of placebo (PLA), protein (PRO) or carbohydrate (CHO) affected fat oxidation (FO) and metabolic parameters during recovery and subsequent exercise.In a cross-over design, 12 moderately trained women (VO2max 45 ± 6 ml·min(-1)·kg(-1)) performed three days of testing. A 23 min control (CON) incremental FO bike test (30-80% VO2max) was followed by 60 min exercise at 75% VO2max. Immediately post-exercise, subjects ingested PLA, 20 g PRO or 40 g CHO followed by a second FO bike test 2h later.Maximal fat oxidation (MFO) and the intensity at which MFO occurs (Fatmax) increased at the second FO test compared to the first following all three post-exercise drinks (MFO for CON=0.28±0.08, PLA=0.57±0.13, PRO=0.52±0.08, CHO=0.44±0.12 g fat·min(-1); Fatmax for CON=41±7, PLA=54±4, PRO=55±6, CHO=50±8 %VO2max, P<0.01 for all values compared to CON). Resting FO, MFO and Fatmax were not significantly different between PLA and PRO, but lower for CHO. PRO and CHO increased insulin levels at 1h post-exercise, though both glucose and insulin were equal with PLA at 2h. Increased post-exercise ketone levels only occurred with PLA.Protein supplementation immediately post-exercise did not affect the doubling in whole body fat oxidation seen during a subsequent exercise trial 2 hours later. Neither did it affect resting fat oxidation during the post-exercise period despite increased insulin levels and attenuated ketosis. Carbohydrate intake dampened the increase in fat oxidation during the second test, though a significant increase was still observed compared to the first test.

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