2024-03-29T07:22:29Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:02005864
2023-04-26T00:41:03Z
1213:1620:1621:1682316489289
短時間の低酸素吸入が随意的筋力発揮能力に及ぼす影響
The Effect of Acute Hypoxia on the Voluntary Muscle Exertion
石田, 浩司
ISHIDA, Koji
宮村, 実晴
MIYAMURA, Miharu
矢部, 京之助
YABE, Kyonosuke
open access
To elucidate the effects of acute hypoxia on neuromuscular functions, 7 male volunteers exerted their maximal plantar flexions for 5 times within 3 min interval with inhaling gas of 12% 02+88% N2- Maximal voluntary contraction (MYC), maximal rate of force development (+dF/dt) and relaxation (-dF/dt), reaction time, root mean square value of EMG (RMS) in soleus and gastrocnemius muscles and mean power frequency of EMG (MPF) were calculated by computer routines. Additionally, minute ventilation (VE) was measured for the last 3 min. These values were compared with those in normoxic (control) condition obtained by the same procedure. During hypoxia, MYC of the subject who showed most enlargement of VE increased successively, but mean value of MVC in hypoxic condition was slightly (4%) increased. +dF/dt was rather increased (12%) while reaction time, MPF and RMS showed little change compared with control condition. Relative changes in MPF and RMS during first 3 min showed significant (p<0.05) negative correlation with each other. These results suggest that the ability to exert maximal voluntary contractions itself show little change, but the way of exerting maximal force may change during hypoxia.
名古屋大学総合保健体育科学センター
The Research Center of Health, Physical Fitness and Sports, Nagoya University
1990-03-26
jpn
departmental bulletin paper
VoR
https://doi.org/10.18999/njhpfs.13.1.37
http://hdl.handle.net/2237/0002005864
https://nagoya.repo.nii.ac.jp/records/2005864
10.18999/njhpfs.13.1.37
0289-5412
総合保健体育科学
Nagoya Journal of Health, Physical Fitness & Sports
13
1
37
45
https://nagoya.repo.nii.ac.jp/record/2005864/files/njhpfs_13_1_37.pdf
application/pdf
4.9 MB
2023-04-26