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Departments of 2 Kinesiology and Applied Physiology and 1 Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, Colorado 80309; and 3 The Sports Medicine Research Institute and Human Performance Laboratory and 4 Division of Molecular Cardiovascular Biology, Department of Pediatrics, The Children's Hospital Research Foundation, Cincinnati, Ohio 45229
The goal of this study was to
characterize the genetic contribution to both forced and voluntary
exercise performance and to determine whether performance in these two
paradigms is controlled by similar genetic influences. There
were marked strain differences in treadmill exercise performance, with
Swiss Webster (SW) and FVB/NJ mice showing elevated performance and
C57BL/6J animals showing decreased performance compared with all other
strains. There was no apparent relationship between treadmill
performance and voluntary wheel performance, with the exception of SW
mice, which demonstrated high performances on both the treadmill and the voluntary wheel. Numerous properties were measured to attempt to
understand the basis for these differences in exercise performance. DBA/1J and SW mice exhibited significantly greater cardiac
contractility than all other analyzed strains. Conversely, BALB/cByJ
mice exhibited significantly reduced cardiac contractility compared
with all other strains. Expression of molecular indicators of
hypertrophy (atrial natriuretic factor and
-myosin heavy chain) was
significantly elevated in DBA/2J myocardium compared with all other
analyzed strains.
heredity; wheel running; treadmill
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