Histochemical responses of rats exercised in two weekly frequencies and ingesting standard or hypercaloric diet
Journal Title: Biology of Sport - Year 2009, Vol 26, Issue 1
Abstract
This study investigated if overfed rats present morphological and histochemical muscle adaptation similar to normally fed, both submitted to two different weekly frequencies of training. Thirty male Wistar rats were fed either with standard chow (SCØ) or with hypercaloric diet (HCØ). They were subdivided into six subgroups: sedentary (SCØ and HCØ), trained twice/week (SC2 and HC2) and trained five times/week (SC5 and HC5). The trained groups swam 60 min/day, during 10 weeks. Twenty four hours after the last training, samples of Gastrocnemius were excised and stained with HE, NADH-TR and m-ATPase, and the capillary density was calculated. Total heart mass (HM) and the mass of atrium (AM), left (LV) and right (RV) ventricles were excised and weighted. The comparisons were made by ANOVA and by Covariance analysis, adjusting the variables by body weight. The results showed that the HCØ achieved higher BM, however, absolute HM did not differ post training. Irrespective of the diet, rats that were trained twice a week presented significantly greater increase in the AM. In general, the SC5 and HC5 groups showed higher HM, LV, RV, proportion of oxidative fibres and capillary density, compared to the sedentary and twice week trained groups. A higher proportion of injuries (splitting) was noted in the HC2 and HC5 compared to SC2 and SC5. These results indicate that the frequency of training influenced the skeletal and heart adaptation and larger changes were observed in the 5x/week group, which ingested the standard diet. The 5x/week training groups also presented large amount of muscle fibres damage.
Authors and Affiliations
FI Freitas, RR Gomes, JPJ Sabino
Keywords
Related Articles
- EP ID EP58960
- DOI -
- Views 92
- Downloads 0
Antioxidant capacity and physical exercise
The aim of this article is a presentation of current knowledge regarding the changes of plasma antioxidant capacity observed in response to physical exercise. Human body created the enzymatic and non-enzymatic systems, w...
Effect of short term caffeine supplementation and intermittent exercise on muscle damage markers
Aim: To evaluate the effect of oral caffeine supplementation and strenuous intermittent exercise on muscle damage markers in soccer players. Materials and Methods: 15 male professional soccer players completed a placebo...
DIFFERENCES IN GROUND CONTACT TIME EXPLAIN THE LESS EFFICIENT RUNNING ECONOMY IN NORTH AFRICAN RUNNERS
The purpose of this study was to investigate the relationship between biomechanical variables and running economy in North African and European runners. Eight North African and 13 European male runners of the same athlet...
Creatinine clearance and 24-hour creatinine excretion profile in the urine of people after physical exercises
Physical exercise is one of the factors disturbing organism homeostasis which can be seen in the urine composition owing to the changes in the hemodynamic and metabolic processes in the kidneys. The aim of the study was...
Relationship between fasting insulin resistance index (FIRI) and plasma glycerol and free fatty acid levels in physically active males and females
It is well known that whole-body insulin sensitivity is greater in sedentary women than in men. However, data concerning insulin sensitivity in physically active males and females are not available. This study aimed at e...