[en] Introduction: Pulmonary rehabilitation can be defined as an interdisciplinary program of care for patients with chronic lung disease such as chronic obstructive pulmonary disease (COPD), which is individually individualized adapted and designed to optimize the patient's exercise capacity and autonomy. These programs include some personalized and educational exercises. The goals of pulmonary rehabilitation are to improve the exercise capacity, quality of life, and symptoms such as dyspnea, and levels of anxiety or depression. Pulmonary rehabilitation is mostly based in aerobic training, which can be done by two ways: using the cycle ergometer or the treadmill. However, there is no evidence in the different clinical guidelines of which modality is the one that reports the best results. Here is the importance of this study. Objectives: To determine the efficacy of two modalities of aerobic training, such as the treadmill and the cycle ergometer, in patients with COPD. Material and methods: Randomized single-blind clinical trial in COPD patients in functional class 2 according to the modified "Medical Research Council Scale" (mMRC). 54 patients will be randomized into three equal groups: two intervention groups (cycle ergometer, treadmill) and one control group. Patients of the two intervention groups will receive 24 training sessions 3 days per week, both with the same workload. The control group participants will only receive educational guidelines on the importance of physical exercise. The patient's exercise tolerance is assessed by the distance walked in the submaximal 6-minute walk test (6MWT), as a main variable. Moreover, the degree of dyspnea, the level of physical activity, health-related quality of life before and after the intervention. The comfort of the training will also be valued. The differences between both workouts groups and with respect to the control one group will be measured. The results will be analyzed with the statistical program "Statistical Package for the Social Science" (SPSS) version 22.0.

[gl] Introdución: A rehabilitación pulmonar pode definirse como un programa de atención interdisciplinar para pacientes con enfermidade pulmonar crónica, como é a enfermidade pulmonar obstrutiva crónica (EPOC), que se adapta individualmente e está deseñada para optimizar o estado físico e social do paciente. Estes programas inclúen exercicios personalizados e educativos. Unha das principais funcións da rehabilitación pulmonar é mellorar a capacidade de exercicio, a calidade de vida, síntomas como a disnea e os niveis de ansiedade e depresión. O pilar básico dos programas de rehabilitación é o adestramento aeróbico, que se pode facer de dous xeitos: mediante o cicloergómetro ou a fita. Aínda así, non hai probas nas diferentes orientacións clínicas de que modalidade é a que presenta os mellores resultados. Isto é o que lle da importancia a este estudio. Obxectivos: Comparar a eficacia de dúas modalidades de adestramento aeróbico, como a fita e o cicloergómetro, en pacientes con EPOC. Material e métodos: Ensaio aleatorio de cego único en pacientes con EPOC na clase funcional 2 segundo a " Medical Research Council Scale" (mMRC). 54 pacientes serán aleatorizados en tres grupos iguais: dous grupos de intervención (cicloergómetro, fita) e un grupo de control. Os pacientes dos dous grupos de intervención recibirán 24 sesións de adestramento 3 días por semana, ambos os dous coa mesma carga de traballo. Os participantes do grupo control só recibirán pautas educativas da importancia do exercicio físico. Valorarase pre-post-intervención a tolerancia do esforzo do paciente medido pola distancia camiñada na proba submáxima de 6 minutos (6MM), como variable principal. Ademais de, o grao de disnea, o nivel de actividade física, a calidade de vida, e a confortabilidade do adestramento. Analizaranse as diferenzas entre os dous adestramentos e respecto ó grupo control. Os datos serán analizados co programa estatístico "Statistical Package for the Social Science" (SPSS) versión 22.0.