Trunk Skeletal Muscle Changes on CT with Long-Duration Spaceflight.

Trunk Skeletal Muscle Changes on CT with Long-Duration Spaceflight.
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DOI:
10.1007/s10439-021-02745-8
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发表时间:
2021-04
影响因子:
3.8
通讯作者:
Weaver AA
Weaver AA
中科院分区:
工程技术2区
文献类型:
--
作者:
Greene KA;Withers SS;Lenchik L;Tooze JA;Weaver AA

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长时间暴露在微重力环境中的宇航员容易出现躯干肌肉萎缩,这可能会影响使命和返回后的力量和功能。本研究采用计算机断层扫描(CT)和双能X射线吸收测定法(DXA)对16名机组人员(1名女性,15名男性)在4 - 6个月的任务中躯干骨骼肌大小和组成的变化进行了研究。在飞行前、飞行后返回、飞行后一年和飞行后2 - 4年,使用腹部CT扫描测量肌肉横截面积和肌肉衰减。使用混合模型分析纵向肌肉变化。在六名机组人员中,CT和DXA数据被用来计算受试者身高标准化骨骼肌指数。采用配对t检验分析这些指标的变化,并采用Pearson相关性通过成像方式进行比较。躯干肌肉面积在飞行后返回时下降(-4.7 ± 1.1%,p <0.001),并在飞行后1 - 4年恢复到飞行前的值。肌肉衰减变化不显著。CT测量的骨骼肌指数降低(− 5.2 ± 1.0%,p = 0.004),而DXA测量的骨骼肌指数无显著变化。总之,躯干肌肉在长时间微重力暴露下会萎缩,但在1 - 4年内会恢复到飞行前的值。CT测量了DXA未检测到的高光尺寸减小,强调了高级成像模式在评估航天肌肉健康方面的重要性。
Astronauts exposed to microgravity for extended time are susceptible to trunk muscle atrophy, which may compromise strength and function on mission and after return. This study investigates changes in trunk skeletal muscle size and composition using computed tomography (CT) and dual energy x-ray absorptiometry (DXA) among 16 crewmembers (1 female, 15 male) on 4–6 month missions. Muscle cross-sectional area and muscle attenuation were measured using abdominal CT scans at pre-flight, post-flight return, one year post-flight, and 2–4 years post-flight. Longitudinal muscle changes were analyzed using mixed models. In six crewmembers, CT and DXA data were used to calculate subject height-normalized skeletal muscle indices. Changes in these indices were analyzed using paired t-tests and compared by imaging modality using Pearson correlations. Trunk muscle area decreased at post-flight return (−4.7±1.1%, p<.001) and recovered to pre-flight values at 1–4 years post-flight. Muscle attenuation changes were not significant. Skeletal muscle index from CT decreased (−5.2±1.0%, p=0.004) while appendicular skeletal muscle index from DXA did not change significantly. In summary, trunk muscle atrophies with long-duration microgravity exposure but recovers to pre-flight values within 1–4 years. The CT measures highlight size decreases not detected with DXA, emphasizing the importance of advanced imaging modalities in assessing muscle health with spaceflight.
DOI: 10.1111/apha.12224
发表时间: 2014-03
期刊: Acta physiologica (Oxford, England)
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