Abstract: Background　Elderly patients are more easily to be found with chronic obstructive pulmonary disease （COPD），as well as its associated sarcopenia and decreased exercise capacity. Exercise capacity has an association with the prognosis，but there is little research on the evaluation methods of the two. Objective　To explore simple and accurate methods that can assess the exercise capacity and prognosis of patients with COPD in the community. Methods　A total of 100 patients with stable COPD were recruited from China-Japan Friendship Hospital from January 2018 to December 2019. The relationships of six-minute walking distance（6MWD） with Short Physical Performance Battery（SPPB） score and modified British Medical Research Council（mMRC） classification were analyzed. Results　The result of 6MWD increased with the decrease of mMRC score for classifying COPD （rs=-0.431，P=0.002）. The AUC of mMRC classification for predicting 6MWD was 0.749 （P<0.001），and the maximum Youden index was 0.426 when 6MWD was 483.5 meters，which was determined as the cut-off threshold. The SPPB was positively correlated with the intragroup data（P<0.001），and its correlation with 5-repetition sit-to-stand（5STS）was the strongest（rs=0.751）. Therefore，6MWD was correlated with 5STS（rs=0.291，P=0.038）. Conclusion　Both mMRC classification and 5STS test could be used as simple methods with relatively high accuracy for the assessment of exercise capacity and prognosis of patients with COPD in primary care，and they are partially correlated. When the 6MWD is less than 483.5 meters，dyspnea restricts movement greatly，and pulmonary rehabilitation can be carried out timely.

Key words: Pulmonary diseases, chronic obstructive；Six minutes walk test；Short physical performance battery；Modified British medical research council

摘要： 背景　慢性阻塞性肺疾病（COPD）是老年患者的常见疾病，肌少症及运动能力下降是普遍存在的问题，运动能力和患者预后有一定的相关性，而对二者评估方法的研究较少。目的　探讨可以在社区评估COPD患者运动能力及预后的简便准确的方法。方法　纳入2018年1月—2019年12月中日友好医院100例COPD稳定期患者，探讨6 min步行试验距离（6MWD）、简易躯体能力测试试验（SPPB）及改良英国医学研究学会呼吸困难指数（mMRC）分级之间的关系。结果　6MWD与mMRC分级呈负相关（rs=-0.431，P=0.002），mMRC分级预测6MWD的受试者工作特征曲线下面积为0.749（P<0.001），当6MWD为483.5 m时，约登指数最大为0.426，是6MWD与mMRC分级的界值。SPPB与组内数据呈正相关（P<0.001），其中5次坐站测试（5STS）与SPPB相关性最高（rs=0.751）。6MWD与5STS具有相关性（rs=0.291，P=0.038）。结论　mMRC分级与5STS测试均可以成为基层评估COPD患者运动能力及预后的简便及较准确的方法，二者有一定的相关性。6MWD低于483.5 m时，呼吸困难对运动的限制较大，可以适时开展呼吸康复治疗。

关键词: 肺疾病, 慢性阻塞性；6 min步行试验；简易躯体能力测试试验；改良英国医学研究学会呼吸困难指数