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THE JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
A Journal on Applied Physiology, Biomechanics, Preventive Medicine,
Sports Medicine and Traumatology, Sports Psychology
Indexed/Abstracted in: Chemical Abstracts, CINAHL, Current Contents/Clinical Medicine, EMBASE, PubMed/MEDLINE, Science Citation Index Expanded (SciSearch), Scopus
Impact Factor 1,111
Original articles BODY COMPOSITION, SPORT NUTRITION AND SUPPLEMENTATION (ergogenics)
The Journal of Sports Medicine and Physical Fitness 2004 September;44(3):281-7
The effect of chronic and acute exercise on thymocyte apoptosis and necrosis in ovariectomized mice given dietary genistein
Hoffman-Goetz L., Duerrstein L.
Department of Health Studies and Gerontology University of Waterloo, Waterloo, ON, Canada
Aim. At menopause, many women consume phytoestrogens instead of beginning hormone replacement therapy. Many also start exercise programs for health benefìts. Genistein, a soy isoflavone with estrogen-like properties, induces lymphocyte apoptosis in vitro. Aerobic exercise also induces apoptosis in lymphoid cells. The present study was designed to determine the effect of chronic (wheel running, WR) and acute (treadmill) exercise on in vivo apoptosis of thymocytes using an animal model of menopause with supplementation from dietary genistein.
Methods. Using a randomized design, 99 ovariectomized B6D2F1 mice were fed 250 (GEN) or 0 (C) ppm genistein and given concurrent exercise (voluntary wheel running-WR; or WR followed by a bout of high intensity treadmill running-WR+TREAD) or remained sedentary (SED). After 21 days, mice were sacrificed for measurements of body weights, tissue weights, thymocyte apoptosis and necrosis by annexin-V FITC and propidium iodide staining and flow cytometry, DNA fragmentation by ELISA, and plasma estrogen concentrations by RIA.
Results. WR+TREAD mice had lower percentages of viable and higher percentages of apoptotic and necrotic cells from thymus compared with SED or WR conditions (p<0.001). WR resulted in greater DNA fragmentation in thymus cell lysates than in samples from SED mice (p<0.005). There were no differences in thymocyte apoptosis or DNA fragmentation between GEN and C mice, either independently or interactively with exercise. GEN mice tended to have greater wheel running activity than C mice (0.05