Estradiol and progesterone influence on the knee joint extensors and flexors relaxation speed
Journal Title: Biology of Sport - Year 2007, Vol 24, Issue 1
Abstract
The aim of the study was to find if a level of hormones influenced relaxation of skeletal muscle force during menstrual cycle. Fifteen physical education students having a regular menstruation without any use of contraceptive pills were tested in ovulatory and luteal phase of menstrual cycle. Relaxation from maximal voluntary contraction was measured during knee extension and flexion using Biodyna dynamometer. The level of estradiol and progesteron were assessed using cheminoluminescent method. The following rates were calculated: early (GWR), late (GPR), most late (GKR), and maximal relaxation ratę (MGR). The estradiol and progesteron level was higher in luteal phase than in ovulatory phase. None of the relaxation indices were statistically different between ovulatory and luteal phase. During knee flexion there was a positive correlation between GKR and estradiol level (r= 0.715), and a negative between GKR and progesterone (r= -0.91). Moreover, there was a negative correlation between MGR and progesterone level (r= -0.705). For knee extensors, there was not found any significant correlation. The result suggest that although there was no changes in relaxation indices between ovulatory and luteal phase of menstrual cycle, the level of progesterone and estradiol might influence the different phases of relaxation indices during knee flexion, but not extension.
Authors and Affiliations
A Jaskólska, K Kisiel, W Brzenczek, R Świstak
Keywords
Related Articles
- EP ID EP58901
- DOI -
- Views 112
- Downloads 0
Effect of the chronological age and sexual maturation on the time to exhaustion at maximal aerobic speed
The purposes of this study were: a) to verify the effect of chronological age and sexual maturation on the time to exhaustion at VO2max (tlim) and; b) to examine the reproducibility of tlim in boys aged 10-15 years. Fort...
Mechanical loading of the gymnast’s motor system during swings on rings
The aim of this work was to identify the mechanical loading of the gymnast’s motor system during forward and backward swings on gymnastic rings. A junior gymnast of the First Class, aged 14, with body mass 53.1 kg and bo...
SERUM LEVEL COMPARISONS OF C-REACTIVE PROTEIN(HS-CRP) AND URIC ACID IN SOCCER PLAYERS AND NONATHLETES
In the present study, we compare the plasma concentration of CRP, uric acid and some other markers between soccer players and nonathletes. Also we intended to evaluate blood markers relation with fitness and anthropometr...
GENES IN SPORT AND DOPING
Genes control biological processes such as muscle production of energy, mitochondria biogenesis, bone formation erythropoiesis, angiogenesis, vasodilation, neurogenesis, etc. DNA profiling for athletes reveals genetic va...
Effect of training on the serum lipid profile in able-bodied and spinal cord injured rugby players
The aim of the present study was to examine the effect of rugby training on the serum lipid profile in able-bodied and wheelchair players. The following groups took part in the study: sedentary able-bodied men (Group M,...