| Creator |
|
|
|
|
|
|
|
|
|
| Language |
|
| Publisher |
|
|
|
| Date |
|
| Source Title |
|
| Vol |
|
| First Page |
|
| Last Page |
|
| Publication Type |
|
| Access Rights |
|
| JaLC DOI |
|
| Related DOI |
|
|
|
|
|
| Related URI |
|
|
|
|
|
| Relation |
|
|
|
|
|
| Abstract |
The purposes of the present study were to investigate various muscle characteristics including the fibre composition and capillary supply, abdominal fat accumulation, and the distance for voluntary wh...eel running. Fast-twitch fibre dominant rats (FFDR) obtained by selection breeding for higher percentage of type II fibres and control rats (CR) obtained by random breeding were used in this study. FFDR had lower percentage of type I (%type I) fibres in M. gastrocnemius and soleus than those of CR, and higher percentage of type IID/B (%type IID/B) fibres in M. gastrocnemius and percentage of type IIA (%type IIA) fibres in M. soleus than those of CR. In the fibre compositions of plantaris muscle, no significant differences were observed between FFDR and CR. The body weight, abdominal fat content, and capillary supply in FFDR were identical with CR. Another groups of animals aged 4wks were subjected to voluntary wheel running for 5 weeks. The running distance in FFDR during the last week and the total running distance were both significantly higher than those in CR. Based on these observations, it is suggested that the muscle fibre composition is not a single determinant of body fat accumulation and influences on physical activity level.
本研究の目的は、骨格筋線維組成、毛細血管供給な どの骨格筋特性、腹腔内脂肪蓄積、および自発運動量を調査することであった。選択交配によって作成された速筋優位モデルラット(fast--twitch fibre domi-nant rats; FFDR)とランダム交配によって作成されたコントロールラット(CR)が木研究に用いられた。いずれも、被検動物は8週令の雄ラットである。 FFDRの腓腹筋およびヒラメ筋のtype I線維の割合(%type I)はCRに比べ有意に低値であり、一方腓腹筋のtype IID/B線維の割合(%type IID/B)とヒラノ筋の%type IIA線維の割合(%type IIA)は、CRに比べ有意に高値を示した。足底筋の筋線維組成には、FFDRおよびCR間に有意差を認めなかった。FFDR の体重、腹腔内脂肪量、および毛細血管供給は、CRとの間に有意差を認めなかった。他のグループを用い、4週令で自発運動量を開始し、5週間継続する研究を行った。FFDRの8週令目の走行距離と全走行距離は、CRに比べ有意に高値であった。これらの観察から、骨格筋線維組成は腹腔内脂肪蓄積に関する単一の要因ではないが、身体活動水準には影響していることが示唆された。show more
|
Export Mendeley
022_p059