A Basic Study on the Skeletal Muscle from the Standpoint of Sports Aptitude* Influence of Hypobaric Hypoxia and Physical Training on Fiber Composition of Skeletal Muscle in Rats -Sex Difference-
【Supercategory：7. DESCENTE SPORTS SCIENCE Subcategory：7.8 Vol.8】
Fifteen male and fifteen female Sprague-Dawley rats were randomly assigned to three groups respectively.
They consisted of untreated control rats bone and raised at sea level (male SL-CO, female SL-CO), swimming training rats at sea level (male SL-SW, female SL-SW), and swimming training rats under intermittent hypobaric exposure (male Hypo ⇄ SL-SW, female Hypo ⇄ SL-SW).
The intermittent hypobaric groups were exposed on alternative two weeks to 460 torr and sea level for 14 weeks beginning at five weeks of ages.
The swimming program consisted of endurance swimming at 30 minutes a day, 3 days a week for 14 weeks.
At nineteen weeks of age, fiber composition of three bird-limb muscles were histochemically studied. Sample of the soleus, EDL and plantaris muscles were sectioned (10μm thick) by cryostat at -20°C.
In soleus muscle, male hypobaric swimming group induced significant increase in FOG fibers and decrease in SO fibers.
EDL and plantaris muscles had a higher percentage of FOG fibers in the male hypobaric swimming group than in the sea level control group.
There were no statistically significant differences in fiber composition of all muscles among female any of groups.
DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
They consisted of untreated control rats bone and raised at sea level (male SL-CO, female SL-CO), swimming training rats at sea level (male SL-SW, female SL-SW), and swimming training rats under intermittent hypobaric exposure (male Hypo ⇄ SL-SW, female Hypo ⇄ SL-SW).
The intermittent hypobaric groups were exposed on alternative two weeks to 460 torr and sea level for 14 weeks beginning at five weeks of ages.
The swimming program consisted of endurance swimming at 30 minutes a day, 3 days a week for 14 weeks.
At nineteen weeks of age, fiber composition of three bird-limb muscles were histochemically studied. Sample of the soleus, EDL and plantaris muscles were sectioned (10μm thick) by cryostat at -20°C.
In soleus muscle, male hypobaric swimming group induced significant increase in FOG fibers and decrease in SO fibers.
EDL and plantaris muscles had a higher percentage of FOG fibers in the male hypobaric swimming group than in the sea level control group.
There were no statistically significant differences in fiber composition of all muscles among female any of groups.
DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE
| Researcher | Kazuo Itoh*1, Sadayoshi Taguchi*2 |
|---|---|
| University or institution | *1 Faculty of Education, Kobe University, *2 College of Liberal Arts, Kyoto University |
Keywords
swimming training, intermittent hypobaric exposure, histochemically