Excepto que se establezca de otra forma, el contenido de esta revista cuenta con una licencia Creative Commons "reconocimiento, no comercial y sin obras derivadas" Colombia 2.5, que puede consultarse en: http://creativecommons.org/licenses/by-nc-nd/2.5/co ResumenEste artículo investiga la factibilidad y aceptabilidad de un ensayo clínico para evaluar el impacto de la entrevista motivacional (em) en la adherencia a la actividad física (af) de pacientes inactivos con diabetes mellitus. En este ensayo se incluyeron treinta participantes; dieciséis recibieron em con refuerzo telefónico durante 4 semanas, los restantes recibieron cuidado convencional. Se evaluó af, índice de masa corporal, nivel de glucosa en la sangre y autoeficacia hacia la af. El grupo de intervención mostró mejoría significativa en la af (p<.05) y el nivel de glucosa en la sangre (p<.05). Al tener en cuenta el cambio en imc para un estudio a gran escala, el cálculo de la muestra oscila entre 710 y 950 pacientes. Para estudios de menor escala, si se tiene en cuenta el cambio en mets, glucemia y autoeficacia, el cálculo de la muestra oscila entre 34 y 272 pacientes.Palabras Clave: diabetes mellitus, adherencia, actividad física, entrevista motivacional, psicología de la salud, ensayo clínico. The Motivational Interview's Impact on Inactive Diabetic Patients' Adherence to Physical Activity: A Pilot Study of a Clinical Trial SummaryThis article studies the feasibility and acceptability in a clinical trial of the impact of the motivational interview (mi) on inactive diabetic (diabetes mellitus) patients' adherence to physical activity (pa). This trial included thirty participants; sixteen received mi with telephone reinforcement for four weeks, the remaining received conventional care. pa, body mass index (bmi), blood glucose level and self-efficacy in pa were measured. The intervention group showed significant improvement in the pa (p<.05) and blood glucose level (p<.05). Taking into account the change in bmi for a large scale study, the calculation of the sample varies between 710 and 950 patients. For smaller-scale studies, taking into account the change in Metabolic Equivalent of Task (met), blood glucose, and self-efficacy, the sample calculation ranges between 34 and 272 patients.
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