Diabetologia:卧床休息和阻力振动运动揭示骨骼肌线粒体功能与胰岛素抵抗之间的新联系

2017-07-31 MedSci MedSci原创

缺乏运动对人类疾病有广泛的影响,包括胰岛素抵抗、肌营养不良和肥胖。本研究研究了以下假设(1)健康年轻男性的线粒体呼吸受损与胰岛素敏感性降低和肌肉量丧失相关联,(2)电阻振动运动(RVE)可减轻卧床休息的负面代谢作用。

近日,国际杂志 《Diabetologia》上在线发表一项关于卧床休息和阻力振动运动揭示骨骼肌线粒体功能与胰岛素抵抗之间的新联系的研究。

缺乏运动对人类疾病有广泛的影响,包括胰岛素抵抗、肌营养不良和肥胖。本研究研究了以下假设(1)健康年轻男性的线粒体呼吸受损与胰岛素敏感性降低和肌肉量丧失相关联,(2)电阻振动运动(RVE)可减轻卧床休息的负面代谢作用。

在交叉研究中参与者(n=9)卧床休息21天同时做RVE和不做组(CON)。高分辨率呼​​吸测定法测定来自股外侧肌活检的透化纤维束中线粒体的呼吸。使用高胰岛素-正葡萄糖钳夹试验确定胰岛素敏感性,并通过双能X线吸收测定法(DEXA)评估身体组成。

均卧床休息期间体重(CONRVE分别为-3.2±0.5 kgvs-2.8±0.4 kgp<0.05),无脂肪质量(-2.9±0.5 kg vs -2.7±0.5 kgp<0.05)氧消耗峰值( VO2peak )(10-15%,p<0.05)均是降低。卧床休息CON组中胰岛素敏感性降低(0.04±0.002mg kgFFM-1 [pmol-1 ]min-1 VS 0.03±0.002 mg kgFFM-1 [pmol-1 ]min-1,基线VSCON后),而RVE缓解了这种反应(0.04±0.003 mg kgFFM-1[pmol-1] min -1)。当相对于组织重量表达时而不是柠檬酸合成酶活性正常化时,CON组中线粒体呼吸(氧化磷酸化和电子传递系统能力)降低,但RVE组没有。LEAK呼吸,表明线粒体解偶联的减少,是柠檬酸合成酶正常化后CON组中唯一保持显著降低的组分。伴随着腺嘌呤核苷酸转位酶蛋白含量的显著降低。

肌肉线粒体呼吸的减少伴随着胰岛素抵抗和卧床休息期间肌肉质量的丧失,并且可能在适应身体休息状态中发挥作用。值得注意的是,研究显示 RVE是部分预防某些卧床休息产生的有害代谢的有效策略。

原始出处:

Helena C. Kenny, Floriane Rudwill, Laura Breen,et al. Bed rest and resistive vibration exercise unveil novel links between skeletal muscle mitochondrial function and insulin resistance.

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    2017-12-02 baoya
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    2017-08-01 Julie W

    近日,国际杂志 《Diabetologia》上在线发表一项关于卧床休息和阻力振动运动揭示骨骼肌线粒体功能与胰岛素抵抗之间的新联系的研究。

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    2017-08-01 189****7206

    学习了谢谢分享

    0

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嗜铬细胞瘤和副神经节瘤是起源于位于肾上腺髓质(嗜铬细胞瘤)及其它肾上腺素能系统(副神经节瘤)的嗜铬组织的肿瘤;临床上分泌大量儿茶酚胺激素引起高血压及其它剧烈的心血管症状;既往的研究发现它们往往还能损害糖耐量。然而,这些肿瘤对胰岛素敏感性和胰岛素分泌的影响还不清楚。因此,来自日本的科学人员探讨了嗜铬细胞瘤或副神经节瘤对糖耐量的影响,并综合分析了这些肿瘤患者的胰岛素分泌和胰岛素敏感性相关的各种参数。研