The historical evolution of the six-minute walk test as a measure of functional exercise capacity: a narrative review
Review Article

六分钟步行试验作为一种功能锻炼能力测量方式的历史进展:叙述性综述

Peter Odion Ubuane1, Barakat Adeola Animasahun1,2, Olufunke Adewumi Ajiboye3, Mogbafolu Olugbemiga Kayode-Awe1, Omotola Aderiyike Ajayi1, Fidelis Olisamedua Njokanma1,2

1Department of Paediatrics, Lagos State University Teaching Hospital, Ikeja, Lagos, Nigeria; 2Department of Paediatrics & Child Health, Lagos State University College of Medicine, Ikeja, Lagos, Nigeria; 3Department of Physiotherapy, Lagos University Teaching Hospital, Idi-Araba, Lagos, Nigeria

Contributions: (I) Conception and design: PO Ubuane, BA Animasahun, OA Ajiboye, FO Njokanma; (II) Administrative support: PO Ubuane, BA Animasahun, FO Njokanma; (III) Provision of study materials or patients: None; (IV) Collection and assembly of data: PO Ubuane, MO Kayode-Awe, OA Ajay; (V) Data analysis and interpretation: PO Ubuane, BA Animasahun, FO Njokanma, MO Kayode-Awe, OA Ajayi; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

Correspondence to: Dr. Peter Odion Ubuane, MBChB, FWACPaed. Department of Paediatrics, Lagos State University Teaching Hospital, 1-5 Oba Akinjobi Way, GRA, Ikeja, Lagos, Nigeria. Email: peterubuane@gmail.com.

摘要:慢性疾病通常与功能能力(进行日常生活活动的能力)的损害有关,因此,需要在基线时对这种损害进行常规评估和监测,并将干预措施作为康复标准的一部分。六分钟步行测试(six-minute walk test,6MWT)是测量、监测和预测功能能力的最常见方式之一。自从20世纪80年代开发以来,它作为一个有效和可靠的工具被越来越多地用于客观量化患有各种慢性心肺、血液学、神经肌肉和代谢疾病的儿童、青少年和成人的功能能力。它已成为了参与照护这些成人和儿童的医生、物理治疗师、生理学家、康复专家和护士从业者们最广泛使用的评估功能能力的工具。大量且不断增加的文献描述了该测试的演变过程,包括现有的功能能力测量、测量特性及其在各种成人和儿童慢性疾病中的实用性,以及来自健康儿童和成人人群的参考标准等。这篇综述按照时间顺序记录了该测试发展过程中具有里程碑意义的事件,并为临床医生和研究人员提供了对该测试的发展具有重要贡献的最新参考文献。因此,它不仅填补了对该测试历史背景的需求,而且提供了大量参考文献资源,有助于临床医生和研究人员了解该测试的不同方面。临床测试历史背景的记录也可以启发从业者在寻求优化患者照护和功能锻炼时保持好奇心和创新精神。

关键词:六分钟步行测试(6MWT);历史;进展;效用


Received: 18 August 2018; Accepted: 18 October 2018; Published: 09 November 2018.

doi: 10.21037/jxym.2018.11.01


引言

功能能力是一个人进行日常生活活动的能力,如步行、洗澡或来回走动,客观量化为最大努力心肺运动试验(cardiopulmonary exercise test,CPET)[1,2]期间的最大耗氧量(maximal oxygen consumption,V02max)。在文献中,术语“功能能力”经常与密切相关但有时不同的术语互换使用,例如“功能锻炼能力”[3]、“工作能力”[4]、“身体素质”[4,5]、“身体机能”[6]、“心肺功能”[6]、“运动耐量”[7]、“运动能力”[8]、“心肺适能”[9,10]、“功能状态”[11,12]、“步行能力”[13]、“有氧力量”[14]、“有氧活动能力”[14]、“行走耐力”[15],以及“心血管健康”[14]等。

评估患者功能能力的概念源于对健康的生物-心理-社会医学模型的逐步理解,在这个模型中,疾病(或损伤)不仅导致正常身体功能或结构的紊乱,而且限制人的日常活动能力,制约个人参与履行社会责任和义务(图1[16]。因此,除了治疗和缓解潜在的或原发性的生理功能紊乱之外,对此类人群的最佳照护还需要测量、评估和改善疾病相关的活动限制及参与限制[17]

图1
图1 健康的生物-心理-社会医学模式,其中,在环境和个体因素的作用下,疾病状态会导致生理或解剖紊乱、活动限制和社会参与受限。转载自“Towards a common language for functioning, disability and health: ICF”, WHO, page 9, Copyright [2002]。

功能能力客观量化的金标准测试——CPET,是一个高度复杂的基于实验室的测试,需要特殊的昂贵设备和经过专门培训的人员。因此,尤其是在初级卫生保健中,患者不易获得,亟需要更简单但同样有效可靠的功能能力现场测量[4,17,18]。目前,有关功能能力研究的最广泛的、有效且可靠的现场测量方法是6分钟步行试验(6MWT)——一种更简单、更便宜的测试,它使用六分钟步行距离(six-minute walk distance,6MWD)来量化功能能力。患者以自行选择的速度在坚硬的表面上,例如在医院走廊步行[1,2,19,20]。由于CPET期间测量的 VO2max 是评估健康的生理紊乱区域,而在 6MWT 期间测量的 6MWD 主要评估活动限制区域。因此,6MWT在患者的功能评估中对CPET进行了补充,在无法进行CPET的时候,6MWT可以作为替代方案。尽管存在一些局限性,但 6MWT 的实用性已在许多慢性成人和儿童疾病中得到证实,涵盖心肺、肌肉骨骼、神经肌肉、代谢、内分泌和血液系统[1,22,23]

尽管关于 6MWT 的各个方面存在大量且不断增加的文献[例如,其测量特性[2,15,22-29]、临床效用和方法论[1,15,19,27,30-33]、以及参考标准[20,34-40]],但很少有一篇论文尝试按照详细时间顺序记录并呈现其演变发展的重要里程碑事件,包括从先前存在的功能能力测量方法到目前最广泛使用的功能能力测量方法。这篇论文将提供6MWT测试“一站式服务”和历史方面的最新参考资料以及关键文献资源,例如,对6MWT测试的各个方面进行的系统评价/Meta分析,以造福临床从业人员和研究人员。


方法与结果

作为之前尼日利亚健康儿童6MWT课题文献检索的一部分,从2013年到2018年8月,我们在多个数据库和搜索引擎(PubMed,Google Scholar,Scopus,SciELO,Google,Yahoo以及Bing)上对与6MWT相关的论文进行了广泛、不受限制的搜索。使用的检索词包括“六分钟步行测试”(“six-minute walk test”)和它的变体,比如“6MWT”、“6分钟步行测试”(“6-minute walk test”)、“6分钟步行测试”(“six-minute walking test”)以及各种形式的“功能能力”(“functional capacity”),例如“运动锻炼能力”(“functional exercise capacity”)、“运动能力”(“exercise capacity”)。为了检索一些6MWT历史层面的特定文献,检索词“历史”(“history”)也包含在其中。

入选论文在发表时间、文献类型(期刊全文、学位论文、会议摘要或海报)、文献地域来源、研究对象年龄范围或发表语言方面没有限制。对于非英文文献,向作者请求英文翻译;当无法获得时,翻译在谷歌翻译的帮助下完成。考虑到这是篇叙述性综述,所以对于文献没有应用严格的质量标准筛选,只要文献信息与预先存在测量功能能力的6MWT的时间顺序发展相关,并将其用作衡量疾病和健康功能能力的主要标准,为临床使用制定参考标准的文献均被纳入。

我们对所选文章的参考文献进行了进一步的检索以获得更多的相关文献。检索到的文献存储在一个数据库中,在需要的时候进行使用。数据库中有一篇最初用阿拉伯语撰写的选定文章[45],作者为我们提供了英文翻译;对于其他三篇用西班牙语书写的文献[46-48],则使用谷歌翻译将其翻译成了英语。


讨论

从实验室到现场测量

20世纪见证了基于实验室的CPET的稳步发展和精密气体测量设备的研制[6,49,50]。随着20世纪20年代早期自行车测力计的发明,最大摄氧量(VO2max)即锻炼者在最大努力CPET期间消耗的最大氧气量,被公认为功能能力测量的金标准[5,6,10,50-52]。Taylor、Mitchell等研究人员发表了早期的执行CPET的标准化方案。然而,有人担心CEPT除了需要复杂的设备外,还相对耗时,因为一次只能测试一个人。因此,基于现场功能能力测量的探索初衷是建立有效和可靠的测试方法,使这些测试可以利用相对简单的设备,同时对大量健康个体(军人)进行评估[4,18,53]

引用最多、最早记录在案的尝试是Balke在1963年报道的[4]。作者通过量化一组受试者以最快速度在跑步机上跑步时的耗氧量来确定VO2max。此后,试者以尽可能快的速度在田野上跑1英里(1英里≈1609.34米),持续不同的时间,并计算达到的速度。作者观察到,跑步12~20 分钟获得的耗氧量(VO2)与在跑步机上获得的最大耗氧量相似。因此得出的结论是,15分钟跑步试验(15-minute run test,15MRT)与最大努力CPET的结果是相当的。随后,这个测试被应用于航空工作人员、肥胖受试者和患者的评估。

1968年,Cooper[18]试图通过对115名空军人员以最快的速度跑12分钟[12分钟跑步试验(12-minute run test,12MRT)]进行研究,来改进Balke的15MRT。跑步试验计算的氧气消耗与在跑步机上获得的VO2max有极好的相关性(相关系数=0.897),因此,作者认为12MRT与Balker的15MRT有相似的效果。随后Cooper的12MRT被广泛地用于军队人员和运动员的功能评估。Cooper[54]随后发布了基于年龄和性别的列线图,用于根据 12MRT 期间达到的距离估算VO2max

1976年,McGavin和同事[7]认为步行比在跑步机上跑步或在测力计上骑自行车更能模拟日常活动;因此,在步行测试期间获得的距离可以比骑自行车或跑步更能反映日常功能损害。这个观点与Spiro和同事们[55]早期研究的结果是一致的,他们的研究表明评估功能能力不需要最大程度的用力(如跑步时可能发生的)。因此,McGavin等人[7]将Cooper的12MRT修改为12分钟步行测试(12MWT),并将其应用在患有慢性阻塞性肺疾病(COPD)的受试者中,让他们在医院室内的走廊里行走。受试者在12分钟内步行距离(12MWD)与CPET期间达到的VO2max显著相关。

同样,在1977年,Mungall和Hainsworth[9]证明了12MWT作为功能能力测量方法的可重复性。这些研究人员还观察到,相比于第1秒用力呼气容积(forced expiratory volume in one second,FEV1),12MWD是一种更好、更客观的功能能力衡量标准。此后,McGavin 的 12MWT 作为客观衡量功能能力的标准得到普遍应用,包括在成人慢性肺病的临床试验中[56-62]

成人受试者中的 6MWT

McGavin的12MWT一直作为常用的功能能力现场测量方法,直到1982年,Butland和同事们[63]认为12MWT“对研究人员来说很费时,又让患者筋疲力尽”。因此,该小组验证了以下假设,即持续时间较短的步行测试[两分钟步行测试(two-minute walk test,2MWT)和6MWT]在功能能力测量方面与12MWT具有相似的效能。据观察,受试者在前两分钟内达到最快步行速度,在随后的两分钟间期内获得了稳定的距离。这3个测试之间的相关性非常好(6MWD vs 12MWD,相关系数=0.955;2MWD vs 12MWD,相关系数=0.864;6MWD vs 2MWD,相关系数=0.892;受试者人数=30),平均12MWD是平均6MWD的2倍,平均6MWD大约是平均2MWD的3倍。作者因此得出结论,6MWT是在相对较长的12MWT和相对较差的2MWT之间的“明智妥协”。

在Butland的6MWT“诞生”两年后,Guyatt等人[8]报道称,相比于2MWT,6MWT能更好地检测出具有临床意义改变的功能能力。此后,6MWT逐渐成为在成人慢性疾病中最常使用的功能能力现场测量方法[23]。它主要用于成人慢性气道疾病中,直到1985年Guyatt等人[11,64,65]报道6MWT与CPET和纽约心脏学会(New York Heart Association,NYHA)成人慢性心力衰竭的功能分类评分显著相关。同样,在1986年,Lipkin等人[66]发现6MWT在测量成人慢性心衰患者的功能能力方面,比CPET有用且不费力。随后,6MWT的用途从心肺领域扩展到代谢疾病、血液疾病、神经肌肉疾病、风湿病、精神疾病、肾脏疾病以及慢性感染性疾病[1,20,23,24,30,67-69]

儿童受试者中的 6MWT

最早在儿童受试者中应用6MWT的报道见于1996年的两项独立研究,分别是Gulmans等人[70]进行的荷兰儿童研究以及Nixon等人[71]进行的美国儿童研究。作者证明了6MWT在衡量囊性纤维化和终末期心肺疾病儿童功能能力方面的有效性和可靠性。随后,6MWT 被测试并用于其他儿童慢性疾病,例如先天性心脏病、终末期肾病、肥胖症、脑瘫和HIV感染[22,72-74]

6MWT的标准化

1984年,Guyatt等人[8]在一项囊括43例成人慢性肺心病患者的随机干预性研究中发现:在6MWT期间采用不同的激励方式会显著影响最终达到的步行距离,因此建议对6MWT进行标准化。然而,直到2002,年美国胸腔学会(American Thoracic Society,ATS)临床肺功能实验室能力标准委员会才发布了第一个标准指南,以协调其临床应用并加强不同研究之间的国际比较,直至这时,6MWT的全面标准化才得以实现。该声明提供了关于患者选择、设备、适应证和禁忌证、标准化每分钟的激励方式和成人人群测试的其他方面。

在随后两次姗姗来迟的对2002年 ATS 指南进行的审查中,ATS联合欧洲呼吸学会(European Respiratory Society,ERS)提供了关于6MWT的测量特性[2]和“标准操作流程”[30]的更新。与2002年的指南相比,这些更新更强调在干预后评估时需要重复测试以解释“学习效果”。2015年,波兰呼吸学会发布了关于6MWT的共识指南[19]

成人6MWT参考标准

随着6MWT作为功能能力测量方式的有效性和可靠性的确立,为了指导测试的临床解释,建立参考标准(带或不带预测回归方程的参考值)的需求变得明显。Enright Sherill于1988年通过对美国290名健康成年人进行研究,发表了第一个成人参考标准和方程式。身高、体重、体重指数(BMI)、年龄和性别是6MWT的独立预测因素。此后,Troosters等人[76]以及Gibbons等人[77]分别于1999年和2001年发表了在比利时健康人群和加拿大健康人群中获得的参考方程式。

这三项研究发表于2002年ATS指南发表之前,其特点是测试方案间的差异很大,包括路线长度和激励方式。在2002年ATS指南发表之后,世界各民族、各地理区域的参考标准和方程式得到了广泛的发展[20,39,78-81]。Salbach等人[80]于2014年发表了对20项研究进行的系统评价,这些研究涵盖了来源于美国、欧洲、亚洲和非洲成年人群的预测参考方程。表1显示了在 Salbach 的系统综述之后发表的其他方程式。

表1
表1 一些*已发表的成人人群预测参考方程式。*,不包含在之前的系统综述中[80]。6MWD,六分钟步行距离(m);M,男性;F,女性;G,性别,除了在印度尼西亚人群研究中F=1,M=0之外,其他研究为M=1,F=0;A,年龄(a);H,身高(m);W,体重(kg);HR,心率(次/分);HRdiff,心率差异;R2,决定系数;PostHR,运动后心率;%predHRmax,预测最大心率百分比;CE,胸部扩张(cm)。
Full table

6MWT在儿科年龄组中的参考标准

儿童 6MWT 参考标准的发布落后于成年人,可能是由于对安全性和有效性的担忧。此外,由于缺乏关于 6MWT 的儿童群体特定指南(迄今为止),对健康和患病儿童受试者的研究将现有的成人指南外推到儿童,并经常进行方法上的修改,例如使用更短的路线长度、激励方法,或设置“安全追逐者”等[22,34-36,38,95-98]

2001,Escobar等人[47]对智利人群进行了研究,发表了首个来源于健康儿童的参考标准(没有方程式的平均6MWT)。后来在2007年,Li等人[99]发表了第一个中国健康儿童青少年6MWD的预测回归方程。随后,来源于欧洲、北美洲的美国、亚洲和非洲健康儿童的参考标准(带或不带方程式)发布。这些参考标准和方程式大多数都已经被总结在Cacau[36]、Mylius[34]和Rodríguez-Núñez等人[40]的3篇独立的系统评价中。没有包括在这些综述中或者发表于这些综述之后的参考方程式请见表2[34,36,38]

表2
表2 一些*已发表的儿童人群预测参考方程式。*,不包含在之前的系统综述中(34,36,40)。6MWD,六分钟步行距离(m);M,男孩;F,女孩;G,性别,M=1,F=0;A,年龄(a);H,身高(m);W,体重(kg);HR,心率(次/秒);HRdiff,心率差异;SBPdiff,收缩压差;R2,决定系数;R1和R2,居住在巴西北部vs南部地区。
Full table

在成人和儿童人群研究中,通过观察到参考值的广泛变化,已经了解/证明了每个民族、地理区域特定的参考值和方程的需求[34,36,40,79,80]。因此,独立于测试方法的差异以及其他影响变量(如人体测量学特征、种族和民族),显著影响受试者在6MWT上的表现[34,36,40,101]

新方法和创新

过去10年出现了旨在提高6MWT的管理效率以及减少测试所需的人力方面的有趣的创新。例如,Du和同事们[27,102]将6MWT的使用概念化为一种以家庭为基础的“自我管理”式的测量社区慢性心力衰竭患者的功能能力(家庭心脏步行测试)。这样可为门诊慢性心脏病患者提供一种自我监测工具(类似于糖尿病护理中的自我监测血糖仪或慢性肺部疾病中的手持式肺活量计),有助于在家时早期发现并追踪功能能力的变化[27]

随着智能手机的出现以及广泛使用,6MWT的管理也随着智能手机应用程序的开发和验证得到了进一步加强,这些应用程序将计圈器、秒表和计算器的功能结合到一个单一的应用程序中,以用于在家庭或诊所环境下进行6MWT[103]。此外,目前已开发的应用程序不仅可以执行上述操作,还可以使用手机上的传感器(如陀螺仪)自动推导6MWD(不计算圈数),并且将数据远距离传输给临床医生[104]。因此,6MWT已经成为衡量慢性疾病患者功能能力的相关指标。


结论

从20世纪80年代初首次被记录使用以来,6MWT已成为成人和儿童人群中最常用的、有效的、可靠的基于现场的功能能力客观测量方法[23]。关于其发展、效用、测量特性以及各民族、各地理人群的参考方程的数据非常丰富,且正在不断增长。除了按照时间顺序记录其多年来的演变,这篇综述还重点介绍了对其发展做出贡献的杰出人物或团体。然而,仍需要制定针对儿童和青少年的特定指南。此外,北美和其他撒哈拉以南非洲地区等种族的儿童也需要参考方程。


Acknowledgements

We express gratitude to authors who provided translations or full texts of their works on request.

Funding: None.


Footnote

Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at http://dx.doi.org/10.21037/jxym.2018.11.01). The authors have no conflicts of interest to declare.

Ethical Statement: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0/.


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译者介绍
李赛男
中国医科大学研究生,专业是心血管内科,师从北部战区总医院的王祖禄老师,主要的研究方向是心律失常。(更新时间:2021/8/19)
审校介绍
贺继强
硕士及博士均就读于中南大学湘雅医院手显微外科。博士就读期间,在国家留学基金委的资助下赴美国约翰霍普金斯大学整形外科学习2年4个月。约翰霍普金斯大学整形外科是世界知名的同种异体手移植中心,我所在的同种异体复合组织移植实验室聚焦于显微外科培训,复合组织移植的基础与临床,器官与组织的低温保存和机器灌注。在美国学习期间整理湘雅医院手显微外科的解剖学和临床病例资料,发表sci论文数篇。(更新时间:2021/8/19)

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doi: 10.21037/jxym.2018.11.01
Cite this article as: Ubuane PO, Animasahun BA, Ajiboye OA, Kayode-Awe MO, Ajayi OA, Njokanma FO. The historical evolution of the six-minute walk test as a measure of functional exercise capacity: a narrative review. J Xiangya Med 2018;3:40.

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