Effects of Exercise on Growth, Resting Metabolism, and Body Composition of Fischer Rats

Ring, G. C.; Bosch, M.W.; Lo, Chu-Shek

doi:10.3181/00379727-133-34645

Cited by 18 publications

(5 citation statements)

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“…Percentages from sucrose in total energy intake exceeded our pre-estimation of 20%; in fact, they were equally 25-26% for both groups. Voluntary running exercise is known to increase the food consumption of rats (23,29). In this study, no difference was found between M-S eaters and E-S eaters in either the total consumption or individual consumptions of the two diets.…”

Section: Discussionmentioning

confidence: 56%

Influence of timing of sucrose meal feeding and physical activity on plasma triacylglycerol levels in rat.

Suzuki

Hashiba

Kajuu

1982

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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SummaryThe present study was undertaken to determine whether the timing of sucrose meal feeding relative to periods of physical activity affects plasma triacylglycerol (TG) levels in rats. Animals were daily meal fed on a basal diet and a 35% sucrose diet for 10 weeks. Meal times were at 08.00-09.00 hr and 21.00-22.00hr. Voluntary running in wheels was allowed between 22.00-08.00hr, but was restricted from 08.00 to 22.00hr. The sucrose diet was given at the morning meal time to one group (M-S eaters) and at the evening meal time to another group (E-S eaters). The timing of the sucrose meal did not have any influence on consumption of either of the two diets, physical activity, weight gain, or the weight of several organs and tissues. Plasma TG, however, was significantly higher in the M-S eaters than in the E-S eaters. Lipoprotein lipase activity of several tissues was not affected by the timing of the sucrose meal. The Triton-induced increase in fasting plasma TG was significantly higher after the sucrose meal than after the basal meal regardless of the timing of the sucrose diet. The TG accumulation rate during the physically inactive period was significantly greater in the M-S eaters than in the E-S eaters, while during the physically active period it was equal in both groups. These results suggest that the effect of sucrose feeding on plasma TG may be conditioned by the timing of sucrose feeding and rats' physical activity.

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Section: Discussionmentioning

confidence: 56%

Influence of timing of sucrose meal feeding and physical activity on plasma triacylglycerol levels in rat.

Suzuki

Hashiba

Kajuu

1982

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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“…Access to running wheels results in significant increases in energy expenditure, as indexed by increased food consumption, as compared to sedentary controls (Swallow et al, 2001), and therefore might result in similar changes in the internal organs required to support nutrient extraction and utilization. However, previous studies of rats do not show significant changes in kidney mass and are contradictory with regard to liver mass (Ring et al, 1970;Pitts, 1984). Unfortunately, these studies are difficult to interpret because organ masses were reported only on a per gram body mass basis (e.g., see Hayes, 2001, and refs.…”

Section: Introductionmentioning

confidence: 97%

Phenotypic and Evolutionary Plasticity of Organ Masses in Response to Voluntary Exercise in House Mice

Swallow

Rhodes

Garland

2005

Integrative and Comparative Biology

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We used a novel mouse model to study the effects of selective breeding for high locomotor activity (14 generations) on relative organ sizes, hematocrit (Hct), and blood hemoglobin (Hb) concentration. We also examined effects of exercise training and genotype-by-environment interactions by housing animals for 8 weeks with wheels that were either free to rotate or locked. Mice from the four replicate High-Runner (HR) lines were smaller in total body mass but had larger body mass-adjusted kidneys relative to the four Control lines (P < 0.05). Control and HR lines did not differ significantly for mass-adjusted tail length or masses of the "triceps surae" hindlimb muscle group, heart (ventricle), spleen, liver, adrenal glands or gonads. Wheel access caused a reduction in body mass and an increase in relative heart mass. In females only, wheel access caused a reduction in relative spleen mass. Wheel access did not affect relative tail length or relative mass of the triceps surae, liver, adrenal gland or gonads. Significant interactions between selection history and wheel access were observed in females for spleen, liver, and gonad mass as well as Hct and Hb. Wheel access caused increases in both Hct and Hb, mainly in the HR lines. The mini-muscle phenotype, caused by a Mendelian recessive allele that halves hindlimb muscle mass, was significantly associated with several other body composition traits, including reduced body mass, increased tail length, increased heart mass, increased liver mass (females only), increased mean adrenal gland mass (females only), increased mean kidney mass (males only), and reduced Hct (wheel-access females only). Results are discussed in context of the beneficial acclimation hypothesis, genotype-by-environment interactions, and the potential for "nurture" to be self-reinforcing of "nature" in some complex behavioral-physiological phenotypes.

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“…running (Dieter, 1969;Ring et ^., 1970;Buuck and Tharp, 1971;Song et , 1973;Tharp and Buuck, 1974). Rats trained by daily swimming were reported to have significant adrenal gland enlargement after three weeks and the enlargement was more pronounced after six weeks (Frenkl and Csalay, 1962).…”

Section: Animal Studiesmentioning

confidence: 99%

Plasma corticosterone concentrations and in vitro adrenal secretion rates in aging rats: effect of physical training and acute swimming

Severson

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Effects of Exercise on Growth, Resting Metabolism, and Body Composition of Fischer Rats

Cited by 18 publications

References 0 publications

Influence of timing of sucrose meal feeding and physical activity on plasma triacylglycerol levels in rat.

Influence of timing of sucrose meal feeding and physical activity on plasma triacylglycerol levels in rat.

Phenotypic and Evolutionary Plasticity of Organ Masses in Response to Voluntary Exercise in House Mice

Plasma corticosterone concentrations and in vitro adrenal secretion rates in aging rats: effect of physical training and acute swimming

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