These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Effect of dietary glycemic index on substrate transporter gene expression in human skeletal muscle after exercise.
    Author: Cheng IS, Liao SF, Liu KL, Liu HY, Wu CL, Huang CY, Mallikarjuna K, Smith RW, Kuo CH.
    Journal: Eur J Clin Nutr; 2009 Dec; 63(12):1404-10. PubMed ID: 19707226.
    Abstract:
    BACKGROUND/OBJECTIVES: Skeletal muscle plays important role in the regulation of whole-body metabolism. In skeletal muscle, uptakes of glucose and fatty acid from circulation are facilitated by transmembrane substrate transporters GLUT4 and FAT/CD36, respectively. The aim of this study was to determine the effect of dietary glycemic index (GI) on GLUT4 and FAT/CD36 gene expressions in human skeletal muscle after a single bout of exercise. SUBJECTS/METHODS: Eight male subjects completed a 60-min cycling exercise at 75% maximal oxygen consumption (VO(2 max)), and were immediately fed an isocaloric meal containing either high-GI (HGI) or low-GI (LGI) diets, with similar proportions of carbohydrate, fat and protein in a crossover design. Muscle samples from deep vastus lateralis were taken by needle biopsy immediately after exercise and 3 h after exercise. RESULTS: After exercise, the HGI diet produced significantly greater glucose and insulin responses compared with the LGI diet, as indicated by the greater area under the curves. Both diets resulted in rapid reductions in plasma fatty acid and glycerol below fasting level. GLUT4 mRNA was downregulated by both HGI and LGI diets to a comparable extent, whereas GLUT4 protein levels were not changed during this short period. FAT/CD36 mRNA and protein levels were substantially decreased with the HGI diet below baseline, but not with the LGI diet. CONCLUSION: This study found a significant dietary GI effect on post-exercise FAT/CD36 gene expression in human skeletal muscle. This result implicates that the differences in dietary GI are sufficient to alter fat metabolism.
    [Abstract] [Full Text] [Related] [New Search]