Department of Clinical Laboratory Medicine, School of Medical Technology, Health Sciences University of Hokkaido, Kita-ku, Sapporo, Japan.
Department of Physical Therapy, Graduate School of Rehabilitation Science, Health Sciences University of Hokkaido, Tobetsu-cho, Ishikari-gun, Japan.
PLoS One. 2021 May 10;16(5):e0251532. doi: 10.1371/journal.pone.0251532. eCollection 2021.
The purpose of this study is to investigate the physical changes of the lower leg muscles in the compartment by observing the changes in the shear wave velocity of the gastrocnemius, soleus and tibialis anterior muscles with time in the sitting position for 2 hours and after elevation of the lower leg.
The subjects were 24 healthy adult males (average age 26.6 years). Shear wave velocity was measured by Aplio 500 in immobilized leg immediately after the start of sitting, 60 minutes and 120 minutes after the start of sitting. After 120 minutes the subjects raised the lower leg for 3 minutes, then measured again.
In the lateral and medial gastrocnemius, there was a significant increase in the velocity at 60 (1.58 ± 0.06, 1.70 ± 0.09 m/s) and 120 minutes (1.70 ± 0.10, 1.83 ± 0.11 m/s) after the start of the test (1.52 ± 0.06, 1.66 ± 0.10 m/s), respectively (p<0.01). In the soleus and the tibialis anterior, there was a significant increase in the velocity at 120 minutes (1.89 ± 0.17, 2.30 ± 0.24 m/s) compared to after the start (1.60 ± 0.15, 2.15 ± 0.26 m/s), respectively (p<0.01). In all muscles, there was a significant decrease in the velocity after the raising compared to that of 120 minutes (p<0.01).
It has been reported that the change of shear wave velocity with time is proportional to the intramuscular pressure in the leg compartment, and it is assumed that the increase of shear wave velocity in the 2-hour seated leg is due to fluid retention in extra-cellular space of the compartment.
本研究旨在通过观察小腿间隔室内腓肠肌、比目鱼肌和胫骨前肌的剪切波速度随时间的变化，探讨坐姿 2 小时及小腿抬高后间隔室内小腿肌肉的形态变化。
本研究共纳入 24 名健康成年男性（平均年龄 26.6 岁）。在坐姿开始后即刻、60 分钟和 120 分钟时，使用 Aplio500 对固定腿进行剪切波速度测量。120 分钟后，受试者抬高小腿 3 分钟，然后再次测量。
在外侧和内侧腓肠肌中，测试开始后 60 分钟（1.58±0.06、1.70±0.09 m/s）和 120 分钟（1.70±0.10、1.83±0.11 m/s）时，速度显著增加（1.52±0.06、1.66±0.10 m/s）（p<0.01）。在比目鱼肌和胫骨前肌中，测试开始后 120 分钟时（1.89±0.17、2.30±0.24 m/s）速度显著增加（1.60±0.15、2.15±0.26 m/s）（p<0.01）。所有肌肉在抬高后与 120 分钟时的速度相比均显著降低（p<0.01）。
已有研究报道，剪切波速度随时间的变化与小腿间隔室内的肌肉内压成正比，因此，2 小时坐姿时小腿的剪切波速度增加可能是由于间隔室内细胞外空间的液体潴留。
