Effects of resistance training on fast- and slow-twitch muscles in rats
Journal Title: Biology of Sport - Year 2010, Vol 27, Issue 3
Abstract
The purpose of this study was to investigate the effect of resistance training (RT) on muscle strength, the dependence of that on the fast-twitch (FT) and slow-twitch (ST) fibers hypertrophy, nuclear domain size, synthesis and degradation rate of contractile proteins and on the expression of myosin isoforms’. 16 weeks old Wistar rats were trained on a vertical treadmill for six days a week during six weeks. The power of exercise increased 4.9% per session. In RT group the mass of studied muscles increased about 10%, hindlimb grip strength increased from 5.20±0.27 N/100g bw to the 6.05±0.29 N/100g bw (p<0.05). Cross-sectional area and number of myonuclei of FT and ST fibers in plantaris (Pla) and soleus (Sol) muscles increased, myonuclear domain size did not change significantly. RT increased the MyHC IId isoforms relative content and decreased that of IIb and IIa isoforms in Pla muscle, in Sol muscle increased only IIa isoform. In Pla muscle the relative content of myosin light chain (MyLC) 1slow and 2slow isoforms decreased and that of MyLC 2fast isoforms increased during RT. MyLC 3 and MyLC 2 ratio did not change significantly in Pla but increased in Sol muscle by 14.3±3.4% (p<0.01). The rat RT programme caused hypertrophy of FT and ST muscle fibers, increase of myonuclear number via fusion of satellite cells with damaged fibers or formation of new muscle fibers as a result of myoblast fusion and myotubes formation, maintaining myonuclear domain size.
Authors and Affiliations
T Seene, A Pehme, K Alev, P Kaasik, M Umnova
Keywords
Related Articles
- EP ID EP59021
- DOI -
- Views 98
- Downloads 0
REPRODUCTIVE HORMONES AND CORTISOL RESPONSES TO PLYOMETRIC TRAINING IN MALES
Plyometric training activities are commonly used by a wide range of athletes to increase jump performance and improve explosive power and muscular activation patterns. The purpose of the study was to evaluate the effects...
USEFULNESS AND METABOLIC IMPLICATIONS OF A 60-SECOND REPEATED JUMPS TEST AS A PREDICTOR OF ACROBATIC JUMPING PERFORMANCE IN GYMNASTS
Gymnastics floor exercises are composed of a set of four to five successive acrobatic jumps usually called a “series”. The aims of the study were: 1) to relate the acrobatic gymnastics performance of these series with a...
PRE-EXERCISE ARGININE SUPPLEMENTATION INCREASES TIME TO EXHAUSTION IN ELITE MALE WRESTLERS
Dietary supplements containing arginine are among the most popular ergogenics intended to enhance strength, power and muscle recovery associated with both anaerobic and aerobic exercise. The aim of the present study was...
ATHLETIC PERFORMANCE OF SWIMMERS AFTER ALTITUDE TRAINING (2,300 M ABOVE SEA LEVEL) IN VIEW OF THEIR BLOOD MORPHOLOGY CHANGES
The aim of the study was to estimate changes in blood morphology caused by participation of record-seeking swimmers in a high altitude training camp at 2,300 m above sea level and to assess their performance during major...
QUERCETIN EFFECTS ON WEIGHT GAIN AND CALORIC INTAKE IN EXERCISED RATS
Quercetin is a flavonoid which activates oxidative metabolism. Quercetin may reduce weight gain by decreasing feed efficiency. The present study aims to evaluate weight gain, caloric intake and feed efficiency in exercis...