The polyunsaturated fatty acids docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) affect vascular relaxation and involve factors (e.g., nitric oxide) that contribute to exercise-induced increases in skeletal-muscle blood flow (Q). The authors investigated whether DHA and EPA supplementation augments skeletal-muscle Q and vascular conductance (VC) and attenuates renal and splanchnic Q and VC in exercising rats. Rats were fed a diet of 5% lipids by weight, of which 20% was DHA and 30% EPA (PUFA group, n = 9), or 5% safflower oil (SO group, n = 8) for 6 wk. Heart rate (HR), blood pressure (MAP), and hind-limb, renal, and splanchnic Q were measured at rest and during moderate treadmill running. MAP, HR, and renal and splanchnic Q and VC were similar between the 2 groups at rest and during exercise. In the PUFA group, Q (158 ± 27 vs. 128 ± 28 ml · min−1 · 100 g−1) and VC (1.16 ± 0.21 vs. 0.92 ± 0.23 ml · min−1 · 100 g−1 · mm Hg−1) were greater in the exercising hind-limb muscle. Q and VC were also higher in 8 of 28 and 11 of 28 muscles and muscle parts, respectively. These increases were positively correlated to the percent sum of Types I and IIa fibers. Results suggest that DHA+EPA (a) enhances Q and VC in active skeletal muscle (especially Type I and IIa fibers) and that the increase in Q is due to an increase in cardiac output secondary to increases in VC and (b) has no apparent influence on vasoconstriction in renal and splanchnic tissue.
Effects of Dietary Omega-3 Polyunsaturated Fatty Acids on the Skeletal-Muscle Blood-Flow Response to Exercise in Rats
Charles L. Stebbins, Lauren E. Hammel, Benjamin J. Marshal, Espen E. Spangenberg, and Timothy I. Musch
Kansas State University Physical Activity Systems Framework: Integration of the Discipline of Kinesiology and Public Health
David A. Dzewaltowski, Mary McElroy, Timothy I. Musch, David C. Poole, and Craig A. Harms
Kinesiology is an academic discipline with a body of content that can be drawn on to support professions and to solve important public health problems. The Kansas State Physical Activity Systems Framework defines a new approach to structure the discipline. Central to the framework is the rejection of a kinesiology subdisciplinary approach and the adoption of an integrated “cell-to-society” systems approach. Each level of physical activity systems is addressed in undergraduate and graduate education and research. Supporting the framework are two research and education teams: exercise physiology and exercise behavioral science. These teams provide core integrated academic discipline content expertise and expertise for integrating professional application areas, such as public health. The framework has evolved over 20 years at Kansas State University, where today the Department of Kinesiology delivers high-quality extramurally-funded research; BS, MS, MPH, and PhD programs; and outreach in a cost-effective manner.