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Magnetic resonance imaging assessment of trunk muscles during prolonged bed rest.

机译：长时间卧床期间躯干肌肉的磁共振成像评估。

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STUDY DESIGN: Prospective longitudinal study. OBJECTIVE.: To investigate, using magnetic resonance imaging (MRI), the influence of bed rest on the lumbopelvic musculature. SUMMARY OF BACKGROUND DATA: Reduced gravitational loading and inactivity (bed rest) are known to result in significant change in musculoskeletal function, although little is known about its effects on specific muscles of the lumbopelvic region. METHODS: Ten healthy male subjects underwent 8 weeks of bed rest with 6 months of follow-up. MRI of the lumbopelvic region was conducted at regular time-points during and after bed rest. Using uniplanar images at L4, cross-sectional areas (CSAs) of the multifidus, lumbar erector spinae, quadratus lumborum, psoas, anterolateral abdominal, and rectus abdominis muscles were measured. RESULTS: Multifidus CSA decreased by day 14 of bed rest (F = 7.4, P = 0.04). The lumbar erector spinae and quadratus lumborum CSA showed no statistically significant difference to baseline across the time of bed rest(P > 0.05). The anterolateral abdominal, rectus abdominis, and psoas CSA all increased over this time. Psoas CSA increased by day 14 (F = 6.9, P = 0.047) and remained so until day 56, whereas the anterolateral abdominal CSA (F = 29.4, P = 0.003) and rectus abdominis CSA (F = 8.9, P = 0.03) were not statistically larger than baseline until day 56. On reambulation after completion of the bed rest phase, multifidus, anterolateral abdominal, and rectus abdominis CSA returned to baseline levels (P > 0.05) by day 4 of follow-up, whereas psoas CSA returned to baseline level after day 28 of the follow-up period. CONCLUSIONS: Bed rest resulted in selective atrophy of the multifidus muscle. An increased CSA of the trunk flexor musculature (increases in psoas, anterolateral abdominal, and rectus abdominis muscles) may reflect muscle shortening or possible overactivity during bed rest. Some of the changes resemble those seen in low back pain and may in part explain the negative effects of bed rest seen in low back pain sufferers.
机译：研究设计：前瞻性纵向研究。目的：使用磁共振成像（MRI）研究卧床休息对腰盆肌肉组织的影响。背景数据概述：减少重力负荷和不活动（卧床休息）会导致骨骼肌肉功能的显着变化，尽管对其对腰盆区域特定肌肉的影响知之甚少。方法：十名健康的男性受试者经过8周的卧床休息以及6个月的随访。在卧床休息期间和之后的定期时间进行腰盆区域的MRI检查。使用L4处的单平面图像，测量多指，腰直肌，腰方肌，腰大肌，腹外侧腹和腹直肌的横截面积（CSA）。结果：卧床休息第14天时多纤维CSA降低（F = 7.4，P = 0.04）。整个卧床休息时间，腰直肌脊柱和腰rat部CSA与基线无统计学差异（P> 0.05）。在此期间，腹前腹，腹直肌和腰大肌CSA均增加。腰大肌CSA在第14天增加（F = 6.9，P = 0.047）并一直保持到第56天，而腹外侧腹CSA（F = 29.4，P = 0.003）和腹直肌CSA（F = 8.9，P = 0.03）直到第56天，统计学上才比基线大。在随访第四天，在卧床休息结束后进行再造时，多纤维，腹部前腹和腹直肌CSA恢复至基线水平（P> 0.05），而腰大肌CSA恢复至随访期第28天后的基线水平。结论：卧床休息导致多裂肌选择性萎缩。躯干屈肌肌肉的CSA升高（腰肌，腹外侧腹和腹直肌增加）可能反映出卧床休息期间肌肉缩短或活动过度。其中一些变化类似于在腰背痛中看到的变化，并且在一定程度上可以解释在下腰痛患者中卧床休息的负面影响。

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