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1 Department of Health and Exercise Science, Fischer Hamilton/Nycom Biochemistry Laboratory, Appalachian State University, Boone, North Carolina 28608; 2 Department of Exercise Science, University of South Carolina, Columbia, South Carolina 29208; and 3 Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, Virginia 24061-0430
Sixteen experienced
marathoners ran on treadmills for 3 h at ~70% maximal oxygen
consumption (
O2 max) on two occasions while receiving 1 l/h carbohydrate (CHO) or placebo (Pla) beverages. Blood and vastus lateralis muscle biopsy samples were collected before
and after exercise. Plasma was analyzed for IL-6, IL-10, IL-1 receptor
agonist (IL-1ra), IL-8, cortisol, glucose, and insulin. Muscle was
analyzed for glycogen content and relative gene expression of 13 cytokines by using real-time quantitative RT-PCR. Plasma glucose and
insulin were higher, and cortisol, IL-6, IL-10, and IL-1ra, but not
IL-8, were significantly lower postexercise in CHO vs. Pla. Change in
muscle glycogen content did not differ between CHO and Pla
(P = 0.246). Muscle cytokine mRNA content was detected
preexercise for seven cytokines in this order (highest to lowest):
IL-15, TNF-
, IL-8, IL-1
, IL-12p35, IL-6, and IFN-
. After
subjects ran for 3 h, gene expression above prerun levels was
measured for five of these cytokines: IL-1
, IL-6, and IL-8 (large
increases), and IL-10 and TNF-
(small increases). The increase in
mRNA (fold difference from preexercise) was attenuated in CHO
(15.9-fold) compared with Pla (35.2-fold) for IL-6 (P = 0.071) and IL-8 (CHO, 7.8-fold; Pla, 23.3-fold; P = 0.063). CHO compared with Pla beverage ingestion attenuates the
increase in plasma IL-6, IL-10, and IL-1ra and gene expression for IL-6
and IL-8 in athletes running 3 h at 70%
O2 max despite no differences in muscle
glycogen content.
muscle glycogen; real-time quantitative reverse transcriptase-polymerase chain reaction; cortisol; glucose
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