News
10 2020 Archives
1012.2020
2020/10/11 Atsuki Fukutani, a lecturer at the Faculty of Sport and Health Science, published a research manuscript in Physiological Reports.
Atsuki Fukutani, a lecturer at the Faculty of Sport and Health Science, published a research manuscript in Physiological Reports in collaboration with Tadao Isaka (Professor in SHS), Akinori Nagano (Professor in SHS), Masafumi Terada (Lecturer in SHS), Tadashi Suga (Assistant professor in SHS), Mitsuo Otsuka (Assistant professor in SHS), Kenji Takao (Graduate student in SHS), Yuto Miyake (Graduated from SHS), Hiromasa Ueno (Graduated from SHS), and Yume Tsuruhara (Undergraduate student in SHS).
In the field of biomechanics, muscle force is estimated from joint torque and relative muscle size. To do this, the values reported in the previous study have been applied to other studies with the assumption that the relative muscle size is identical among subjects. This is because it is difficult to measure the individual relative muscle size. However, considering the fact that the extent of muscle hypertrophy is different dependent on fiber type, one can speculate that the relative muscle size can be different among subjects with different training status. Thus, we compared the relative muscle size among subjects having different training status. As expected, the relative muscle size was different among subjects. This result indicates that the results obtained by the abovementioned estimated method are not necessarily correct, and suggests that obtaining individualized information is important to conduct an in-depth examination.
Atsuki Fukutani, Yume Tsuruhara, Yuto Miyake, Kenji Takao, Hiromasa Ueno, Mitsuo Otsuka, Tadashi Suga, Masafumi Terada, Akinori Nagano, Tadao Isaka (2020). Comparison of the relative muscle volume of triceps surae among sprinters, runners, and untrained participants. Physiological Reports (Published Ahead of Print) doi: doi.org/10.14814/phy2.14588
Journal website:
https://physoc.onlinelibrary.wiley.com/doi/10.14814/phy2.14588
1005.2020
2020/10/01 Sumiaki Maeo is a Senior Researcher in Research Organization of Science and Technology, and his research manuscript has been accepted and published in Medicine and Science in Sports and Exercise.
The hamstrings are lengthened more in a seated (hip-flexed) than prone (hip-extended) position, due to its bi-articular nature crossing the knee and hip joints. This study demonstrated that hamstrings muscle size was 1.5-fold more effectively increased by seated than prone leg curl training, suggesting that training at long muscle lengths promotes muscle hypertrophy, while both were similarly effective in reducing susceptibility to muscle damage. The results of this study will be useful in developing training programs which aim to improve sports performance, reduce the risk of strain injuries, and counteract age-related sarcopenia.
Sumiaki Maeo, Huang Meng, Wu Yuhang, Hikaru Sakurai, Yuki Kusagawa, Takashi Sugiyama, Hiroaki Kanehisa, Tadao Isaka (2020). Greater hamstrings muscle hypertrophy but similar damage protection after training at long vs short muscle lengths. Medicine & Science in Sports & Exercise (Published Ahead of Print) doi: 10.1249/MSS.0000000000002523
Journal website:
