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Inès Daguet,1,2 Kayla Bergeron-Vézina,1,2 Marie-Philippe Harvey,1,2 Marylie Martel,1,2 Guillaume Léonard2,3 1Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, QC, Canada; 2Research Center on Aging, Institute of Geriatrics of Sherbrooke, Sherbrooke, QC, Canada; 3École de réadaptation, Faculté de médecine et des sciences de la santé, Université de Sherbrooke, Sherbrooke, QC, Canada Purpose: Placebo analgesia refers to a perceived reduction in pain intensity following the administration of a simulated or otherwise medically ineffective treatment. Previous studies have shown that many factors can influence the magnitude of placebo analgesia. However, few investigations have examined the effect of age on placebo analgesia, and none have done it in the context of electrotherapeutic interventions. The objective of this study is to compare the placebo response induced by sham transcutaneous electrical nerve stimulation (TENS) between young and older individuals, using an experimental heat-pain paradigm.Patients and methods: Twenty-two young (21–39 years) and 22 older (58–76 years) healthy adults participated in this comparative study. Experimental heat pain was evoked with a thermode (2-min stimulation at a constant individually adjusted temperature) applied on the lumbar region. Participants were asked to evaluate the intensity of their pain using a computerized visual analog scale. Experimental pain was induced before and after an unconditioned placebo intervention (placebo TENS) applied for 25 min.Results: In young individuals, no significant pain reductions were noted, whereas in older individuals, a statistically significant pain reduction was observed after the placebo stimulation (P

Marie-Philippe Harvey,1,2 Dominique Lorrain,1,3 Marylie Martel,1,2 Kayla Bergeron-Vezina,1 Francis Houde,1,2 Mario Séguin,2,4 Guillaume Léonard1,2,5 1Research Centre on Aging, CIUSSS de l’Estrie-CHUS, 2Faculty of Medicine and Health Sciences, Université de Sherbrooke, 3Department of Psychology, Université de Sherbrooke 4Department of Neurosurgery, Centre Hospitalier Universitaire de Sherbrooke, 5School of Rehabilitation, Université de Sherbrooke, Sherbrooke, QC, Canada Background: The prevalence of chronic pain and sleep disturbances substantially increases with age. Pharmacotherapy remains the primary treatment option for these health issues. However, side effects and drug interactions are difficult to control in elderly individuals.Aims: The objective of this study was to assess the feasibility of conducting a randomized sham-controlled trial and to collect preliminary data on the efficacy of transcranial direct current stimulation (tDCS) to reduce pain and improve sleep in older adults suffering from chronic pain.Methods: Fourteen elderly individuals (mean age 71±7 years) suffering from chronic pain and sleep complaints were randomized to receive either anodal tDCS, applied over the primary motor cortex (2 mA, 20 minutes), or sham tDCS, for 5 consecutive days. Pain was measured with visual analog scales, pain logbooks and questionnaires, while sleep was assessed with actigraphy, sleep diaries and questionnaires.Results: There were no missing data for pain and sleep measures, except for actigraphy, that generated several missing data. Blinding was maintained throughout the study, for both the evaluator and participants. Active but not sham tDCS significantly reduced pain (P