eCite Digital Repository
Effect of dietary fat on serum and intramyocellular lipids and running performance
Citation
Larson-Meyer, DE and Borkhsenious, ON and Gullett, JC and Russell, R and Devries, MC and Smith, SR and Ravussin, E, Effect of dietary fat on serum and intramyocellular lipids and running performance, Medicine and Science in Sports and Exercise, 40, (5) pp. 892-902. ISSN 0195-9131 (2008) [Refereed Article]
Copyright Statement
Copyright 2008 American College of Sports Medicine
DOI: doi:10.1249/MSS.0b013e318164cb33
Abstract
METHODS: Twenty-one male and female endurance-trained runners followed a controlled diet and training regimen for 3 d prior to consuming either a LFAT (10% fat) or MFAT (35% fat) isoenergetic diet for another 3 d in random crossover fashion. On day 7, runners followed a glycogen normalization protocol (to equalize glycogen stores) and then underwent performance testing (90-min preload run at 62 +/- 1% VO2max followed by a 10-km time trial) on the morning of day 8. Muscle biopsies obtained from vastus lateralis before and after performance testing were analyzed for IMCL (via electron microscopy) and glycogen content (via enzymatic methodology).
RESULTS: Despite approximately 30% lower IMCL (0.220 +/- 0.032% LFAT, 0.316 +/- 0.049% MFAT; P = 0.045) and approximately 22% higher muscle glycogen stores at the start of performance testing (P = 0.10), 10-km performance time was not significantly different following the two diet treatments (43.5 +/- 1.4 min LFAT vs 43.7 +/- 1.2 min MFAT). However, LFAT produced less favorable lipid profiles (P < 0.01) by increasing fasting triglycerides (baseline = 84.9 +/- 8.6; LFAT = 118.7 +/- 10.0 mg.dL(-1)) and the total cholesterol:HDL cholesterol ratio (baseline = 3.42 +/- 0.13:1; LFAT = 3.75 +/- 0.20:1), whereas MFAT lowered triglycerides (baseline = 97.5 +/- 12.2; MFAT = 70.9 +/- 7.1 mg.dL(-1)) and the total cholesterol:HDL cholesterol ratio (baseline = 3.47 +/- 0.18:1; MFAT = 3.33 +/- 0.14:1).
CONCLUSION: The results suggest that reducing IMCL via 3-d consumption of a LFAT diet does not impair running performance lasting a little over 2 h (compared with 3-d consumption of a MFAT diet plus 1-d glycogen normalization), but that even short-term consumption of a LFAT diet may unfavorably alter serum lipids, even in healthy, endurance-trained runners.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | intramyocellular lipids and running performance |
Research Division: | Health Sciences |
Research Group: | Sports science and exercise |
Research Field: | Exercise physiology |
Objective Division: | Health |
Objective Group: | Evaluation of health and support services |
Objective Field: | Evaluation of health and support services not elsewhere classified |
UTAS Author: | Russell, R (Dr Ryan Russell) |
ID Code: | 98043 |
Year Published: | 2008 |
Web of Science® Times Cited: | 10 |
Deposited By: | Menzies Institute for Medical Research |
Deposited On: | 2015-01-29 |
Last Modified: | 2015-04-21 |
Downloads: | 0 |
Repository Staff Only: item control page