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1 Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, Louisiana 70808; and Departments of 2 Critical and Diagnostic Care and 3 Human Studies, The University of Alabama at Birmingham, Birmingham, Alabama 35294
Using a randomly assigned crossover design, we evaluated
the change in intramyocellular lipid stores (IMCL) from baseline after
a 2-h treadmill run [67% of maximal oxygen uptake
(
O2 max)] and the recovery of IMCL in
response to a postexercise very low-fat (10% of energy, LFAT) or
moderate-fat (35% of energy, MFAT) recovery diet in seven female
runners. IMCL was measured in soleus muscle by use of water-suppressed
1H-NMR spectroscopic imaging before (baseline), after, and
~22 h and 70 h after the run. IMCL fell by ~25%
(P < 0.05) during the endurance run and was dependent
on dietary fat content for postexercise recovery (P = 0.038, diet × time interaction). Consumption of the MFAT recovery
diet allowed IMCL stores to return to baseline by 22 h and to
overshoot (vs. baseline) by 70 h postexercise. In contrast,
consumption of the LFAT recovery diet did not allow IMCL stores to
return to baseline even by 70 h after the endurance run
(P < 0.01 at 70 h). These results suggest that a
certain quantity of dietary fat is required to replenish IMCL after
endurance running.
serum triglycerides; proton magnetic resonance spectroscopy; insulin; leptin; dietary fat
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