Summary

研究力量运动对肥胖成人胰岛素敏感性的急性影响的随机对照试验

Published: December 01, 2023
doi:

Summary

本研究描述了一项随机对照试验方案,旨在评估力量运动量对肥胖个体胰岛素敏感性的急性影响。

Abstract

急性力量运动 (SE) 可改善胰岛素敏感性 (IS) 数小时;然而,SE体积(即组数)的影响尚未得到彻底研究。虽然直觉上,一些 SE 总比没有好,而且对于改善 IS 来说,多于一些优于某些,但对于患病人群来说,大容量的疗程可能具有挑战性,尤其是肥胖的成年人,对他们来说,即使是快走也可能具有挑战性。该协议详细介绍了一项随机临床试验,以评估 SE 对肥胖成人 IS 的急性影响。纳入标准是体重指数 >30 kg/m2、向心性肥胖(女性和男性的腰围分别为 >88 cm 和 >102 cm)和年龄 >40 岁。参与者将熟悉 SE(针对主要肌肉群的 7 项练习),然后将按随机顺序进行三个疗程:第 1 节 – 高容量疗程(3 组/练习);第 2 节 – 低音量训练(1 组/练习);第 3 节 – 控制会话(无练习)。饮食将在会议前一天和当天进行控制。会议将在晚上完成,第二天早上将进行口服葡萄糖耐量试验,从中得出 IS 的几个指标,例如葡萄糖和胰岛素的曲线下面积 (AUC)、Matsuda 指数、Cederholm 指数、肌肉 IS 指数和 Gutt 指数。根据初步研究,与对照组相比,我们预计高容量疗程后 IS(胰岛素 AUC、Matsuda 和 Cederholm 指数)改善 ~15%,低容量疗程后改善 ~8%。这项研究将使那些发现大量 SE 会议具有挑战性但仍旨在通过投入 1/3 的时间和精力来改善他们的 IS 的个人受益。

Introduction

尽管力量训练对胰岛素敏感性的慢性影响已被反复证明 1,2,3但即使是急性的力量锻炼也可以改善胰岛素作用长达 48 小时4这种效果已在健康5678、肥胖 9、老年 10胰岛素抵抗个体4 和 2 型糖尿病患者中得到证实 11其他人没有报告积极影响12,13,14,15,16,17目前尚不清楚为什么会出现这些差异。

在最近的叙述性综述18 中,有人提出力量运动量(每次运动的组数)对于提高胰岛素敏感性至关重要。例如,最近的一项系统评价和荟萃分析表明,与少于 21 组或更少的疗程相比,由 21 组或更多组成的疗程可使胰岛素作用得到更大的改善19.然而,只有有限的文献证据直接支持这一观点。例如,较高的力量运动量(30 组)比较低的运动量(10 组)更能改善葡萄糖代谢20。但值得注意的是,本研究采用的是循环式力量练习,限制了与传统力量练习的比较。在另一项研究中,与 8 组方案相比,在 32 组力量锻炼方案后观察到更好的胰岛素敏感性21.然而,没有报道组后的努力程度,并且在大容量方案之后可能更大。这很重要,因为努力程度(或接近同心性肌肉衰竭,其特征是由于给定重复的同心运动失败而无法继续设置)也被认为是改善胰岛素和葡萄糖代谢的重要变量18。因此,关于该主题的现有研究有限,以及其方法学上的局限性,排除了关于力量运动量对胰岛素敏感性影响的进一步推论。

在讨论力量运动量时,另一个有趣的观点是它与时间投入有着内在的联系。根据设计,较低的运动量意味着在健身房花费的时间更少。在不坚持锻炼计划的原因中,缺乏时间位居榜首22.因此,有效提高胰岛素敏感性的低容量力量锻炼意味着更少的时间投入23,并可能导致更高的长期依从性。此外,主观感受,如自我效能感(对完成某事能力的自我感知)以及愉悦和乐趣的感觉(享受),也与运动依从性有关24,25,26。可以合理地推测,当人们进行低容量的力量锻炼时,他们可能会感到更自信,更享受他们的锻炼体验,从而改善健康。

为了解决上述文献中的空白,我们描述了一项随机、对照、交叉临床试验的方案,其主要目的是评估力量运动量对肥胖个体胰岛素敏感性的影响。作为次要目标,我们评估力量运动量对主观感受(自我效能感、感情和享受)的影响。

此处的方案描述了一项随机、对照、3 向、交叉的临床试验。该协议的时间顺序包括:参与前对健康史和人体测量测量(体重、身高、腰围和身体成分)的评估;与团队的认证营养师预约;熟悉力量练习和主观感受问卷;每次运动的力量评估;随机分配会话顺序;3 节课的表现(相隔 7-28 天),随后立即回答主观感受问卷;第二天早上进行口服葡萄糖耐量试验 (OGTT);和数据分析。 图 1 描绘了协议设计。

Figure 1
图1:研究设计。 以下是试验方法的流程图。1:肥胖(体重指数[BMI]>30 kg/m2;腰围>102/88 cm)受试者;2:人体测量评估和熟悉;随机分配到 3:高容量力量锻炼课程(21 组),4:低容量力量锻炼课程(7 套),或 5:控制日;6:标准餐后会议;7:睡眠和过夜禁食;8:口服葡萄糖耐量试验。 请点击这里查看此图的较大版本.

Protocol

通过向当地机构审查委员会 (IRB) 或当地研究伦理委员会 (REC) 提交研究方案和知情同意书来获得研究的伦理许可。该研究只能在 IRB 或 REC 批准后开始。下面显示的结果来自一项试点研究,受试者在入组前签署了书面知情同意书。在 IRB 或 REC 批准后,前瞻性地将协议注册到公共存储库中,例如临床试验 (https://clinicaltrials.gov)。如果您所在的国家/地区有国家存储库,请在那里注册协议(例如…

Representative Results

图 2 显示了 OGTT 期间葡萄糖(图 2A)和胰岛素(图 2B)的代表性(来自初步研究)反应。通常,在30分钟测量时观察到葡萄糖和胰岛素值的峰值,随后持续下降,直到120分钟测量。葡萄糖峰值越低,结果越好,这表明抑制肝脏葡萄糖的产生。峰值后葡萄糖下降得越快,结果越好,这表明葡萄糖处理速度更快(通常与骨骼肌葡萄糖?…

Discussion

本文详细介绍了一项随机对照试验的步骤,该试验旨在评估力量运动量对肥胖成人胰岛素敏感性的影响。随机对照试验是以无偏倚的方式确定治疗因果关系的最佳研究方案49,50。具体来说,在这项研究中,我们将采用交叉设计,这意味着每个招募的受试者都将按随机顺序执行每个条件51 尽管交叉研究增加了受试者的负担,并且不适合具…

Divulgations

The authors have nothing to disclose.

Acknowledgements

这项研究得到了国家科学技术发展委员会(CNPQ:Grant#407975/2018-7和#402091/2021-3)和米纳斯吉拉斯州研究与发展局(FAPEMIG:Grant#APQ-00008-22)的支持。资助者在本研究的设计中没有发挥任何作用,在研究进行、数据解释或结果报告方面也没有发挥任何作用。这项研究以Jequitinhonha和Mucuri Valleys联邦大学(巴西Diamantina-MG)为基础,该大学提供进行研究所需的设备和空间(DXA,力量训练室,力量训练设备等)。

Materials

dual-energy X-ray absorptiometry GE DXA, Lunar, iDXA Advanced for assessing body composition
G*Power program  Heinrich-Heine-Universität Düsseldorf, Germany version 3.1.9.6 for calculating sample size

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Rocha Silva, L. F., Chaves Garcia, B. C., Mang, Z. A., Amorim, F. T., Dias-Peixoto, M. F., Gripp, F., Tricoli, V., Magalhães, F. d. C. Randomized Controlled Trial to Study the Acute Effects of Strength Exercise on Insulin Sensitivity in Obese Adults. J. Vis. Exp. (202), e65478, doi:10.3791/65478 (2023).

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