Evaluation of energy d deficiency due to running and food restriction on skeletal muscle quality

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K19531
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 59020:Sports sciences-related
• Research Institution: Tsu City College
• Principal Investigator: Aikawa Yuki 三重短期大学, 食物栄養学科, 准教授 (10815749)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 走運動 / エネルギー不足 / 筋質 / 持久的アスリート

Outline of Final Research Achievements

Energy deficiency due to running and food restriction decreased body weight, abdominal fat weight, plantar muscle weight, soleus muscle weight, uterine weight, and bone mineral density in young female rats. On the other hand, even under diet-restricted conditions, the number of capillaries around each individual fiber related to the cross-sectional area of each individual fiber and the expression of complex I, complex IV, and complex V, indicators of mitochondrial content, after running exercise were higher in plantaris muscle, which is mainly composed of fast twitch muscle fibers. These results suggest that energy deficiency due to running and food restriction improve indices related to muscle endurance.

Free Research Field

運動栄養学

Academic Significance and Societal Importance of the Research Achievements

本研究では，走運動と食餌量制限によるエネルギー不足は，筋の持久的な能力に関連する指標を向上させることが認められた．この結果は，競技者にとっては喜ばしいことかもしれないが，一方で，骨密度は低値となることが確認された．このことは，競技力が向上していても，怪我の危険性が高まっていることを示唆している．本研究の成果は，競技が好調な時であっても，競技者本人や周囲の人間が怪我の危険性に注意を払い，エネルギー不足が生じないように努める必要があることを示す知見になる．