Publications by Colleges and Departments (MSU - Bozeman)
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Item Carbohydrate Influences Interleukin-6 but not C-reactive Protein or Creatine Kinase Following a 32-km Mountain Trail Race(Human Kinetics, 2005) Miles, Mary; Walker, E.E.; Conant, S.B.; Hogan, S.P.; Kidd, J.R.Attenuation of exercise-induced interleukin-6 (IL-6) responses by carbohydrate (CHO) has been demonstrated in studies comparing controlled doses (≥ 0.9 g · kg–1 · h–1) to placebo, but not in studies of voluntary intake. This study sought to determine if attenuation of the IL-6 response during a 32.2-km mountain trail race occurs for high compared to low ad libitum CHO intakes. IL-6, C-reactive protein (CRP), and creatine kinase activity (CK) were analyzed from blood samples collected 12 h pre-, 0, 4, and 24 h post-race. Subjects were grouped into low (n =14, 0.4 ± 0.1 g · kg–1· h–1) and high (n =18, 0.8 ± 0.2 g · kg–1 · h–1) CHO intake groups. IL-6 0 h post-race (P < 0.05) was higher in the low (40.2 ± 22.7 pg · mL–1) compared to the high CHO group (32.7 ± 22.1 pg · mL–1). CRP and CK both increased post-race, but no differences were observed between groups. Attenuation of exercise-induced IL-6 is apparent across a range of CHO intakes.Item Effect of Carbohydrate Intake During Recovery from Eccentric Exercise on Interleukin-6 and Muscle Damage Markers(Human Kinetics, 2007) Miles, Mary; Pearson, Sherri Diane; Andring, J.M.; Kidd, J.R.; Volpe, S.L.The purpose of this investigation was to determine whether carbohydrate supplementation during the first 2 d postexercise recovery influenced the inflammation (IL-6, C-reactive protein [CRP], and cortisol) and muscle-damage responses. Eight participants performed a high-force eccentric elbow-flexion exercise to induce muscle soreness and inflammation and then consumed carbohydrate (0.25 g·kg–1·h–1) or an equal volume of placebo during hours 0–12 and 24–36 postexercise in a double-blind, crossover protocol. Muscle soreness; midbrachial arm circumference; blood glucose, IL-6, CRP, cortisol, and creatine-kinase (CK) activity; and maximal force production were measured preexercise and 4, 8, 12, 24, 48, and 120 h postexercise. Plasma IL-6 increased, F(5) = 5.27, P < 0.05, 8 h postexercise, with no difference between carbohydrate and placebo conditions. Changes in muscle soreness, arm circumference, strength, and serum CK activity were consistent with small amounts of muscle damage and did not differ between conditions. The authors conclude that carbohydrate supplementation during recovery from soreness-inducing exercise does not influence the delayed IL-6 response temporally linked to inflammation or indications of muscle damage. Thus, increased carbohydrate consumption at levels consistent with recommendations for replenishing glycogen stores does not impair or promote the immune and muscle responses.Item Interactive Effects of APOE Haplotype, Sex, and Exercise on Postheparin Plasma Lipase Activities(American Physiological Society, 2011) Miles, Mary; Seip, R.L.; Zoeller, Robert F.; Angelopoulos, T.J.; Salonia, J.; Bilbie, C.; Moyna, Niall M.; Visich, Paul S.; Pescatello, Linda S.; Gordon, P.M.; Tsongalis, Gregory J.; Bausserman, L.; Thompson, P.D.Hepatic lipase (HL) and lipoprotein lipase (LPL) activities (HLA, LPLA) modify lipoproteins and facilitate their binding to hepatic receptors. Apolipoprotein E (APOE) physically interacts with the lipases, and the three common haplotypes of the APOE gene (ε2, ε3, and ε4) yield protein isoforms (E2, E3, and E4, respectively) that are functionally different. Lipase activities themselves differ by sex and exercise training status. The interaction of APOE genotype, exercise training, and sex effects on lipase activities has not been studied. We measured postheparin plasma lipase activities in normolipidemic men and women with the three most common APOE genotypes, which are the haplotype combinations ε2/ε3 (n 53 ), ε3/ε3 (n 62), and ε4/ε3 (n 52), enrolled in 6 mo of aerobic exercise training. These haplotype combinations comprise an estimated 11.6, 62.3, and 21.3% of the population, respectively. Baseline HLA was 35% lower in women than in men (P 0.0001). In men but not women, HLA was higher in ε2/ε3 group compared with ε4/ε3 (P 0.01) and ε3/ε3 (P 0.05). Neither sex nor APOE genotype affected baseline LPLA. Training decreased HLA by 5.2% (P 0.018) with no APOE effect. The apparent increase in LPLA following exercise was significant and APOE dependent only when corrected for baseline insulin (P 0.05). Exercise decreased LPLA by 0.8 mol free fatty acid (FFA)·ml 1·h 1 ( 6%) in ε3/ε3 compared with the combined increases of 6.6% in ε2/ε3 and 12% in ε4/ε3 (P 0.018 vs. ε3/ε3). However, these differences were statistically significant only after correcting for baseline insulin. We conclude that common APOE genotypes interact with 1) sex to modulate HLA regardless of training status, with ε2/ε3 men demonstrating higher HLA than ε3/ε3 or ε4/ε3 men, and 2) aerobic training to modulate LPLA, regardless of sex, with ε3/ε3 subjects showing a significant decrease compared with an increase in ε2/ε3 and ε3/ε4 after controlling for baseline insulin.