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Showing 1-9 of 9 trials
NCT06980090
The goal of this clinical trial is to learn whether non-invasive brain stimulation, called transcranial temporal interference stimulation (tTIS), can reduce negative affect, and how expectations shaped by care providers influence these effects. The main questions this study aims to answer are: (1)Does active tTIS reduce negative affect more effectively than sham (inactive) tTIS? (2)Do positive treatment expectations enhance the effects compared to negative expectations? Participants will: (1) Receive either active or sham tTIS. (2) Be provided with positive or negative messaging regarding treatment effectiveness. (3) Interact with care providers and complete assessments measuring negative affect and physiological responses.
NCT04646460
In this experiment, the investigators study the brain pathways underlying several promising context interventions that enhance the strength of placebo effects. Specifically, the investigators examine the separate and joint effects of two of the most powerful context interventions: Social modeling-observing someone else being effectively treated-and prior treatment success or failure experiences. Participants will be randomized into 4 groups (Social modeling: observed success vs. observed failure and Conditioning: experienced success vs. experienced failure). The objectives are to investigate the placebo effect on pain relief and aversive image stimuli between and within-subjects. Each group will undergo a behavioral induction phase, fMRI placebo test phase, and an identical 3-month follow up fMRI placebo test phase. Follow-up assessment will provide some of the first evidence on predictors of the durability of placebo and context interventions.
NCT06827444
This project aims to examine whether these forms of attention to sensory information can modulate the mind-body interaction. This will be demonstrated through a study focused on the placebo effect with attention manipulation. Specifically, the project will focus on the construct of mindful attention to increase the precision of the likelihood and reduce the effects of priors, and on directed attention to modify the position and precision of the likelihood, hypothetically modulating the placebo effect. The study involves recruiting 128 healthy individuals, who will be asked to cycle on an ergometer for approximately 60 minutes, with alternating phases in which attention will be manipulated. After an initial warm-up phase, they will receive a placebo drink, presented as "highly stimulating." An additional group of 32 participants will not receive either the placebo drink or the attentional stimuli, but will undergo the same training cycles. All participants will receive a pre-intervention assessment, and heart rate, emotions, and perceived fatigue will be monitored.
NCT06746389
Background: Healthy adults maintain muscle tissue by continuously building up and breaking down muscle proteins throughout the day. Studies have shown that vitamin D (VitD) is essential for maintaining muscle mass by activating cellular pathways involved in building muscle via muscle protein synthesis (MPS). Although, various candidate molecules have been identified in animal models, it is not known whether these pathways are activated in humans. Interestingly, animal studies indicate that 20% of VitD is stored in human muscle cells, which may help maintain VitD sufficiency during winter in Northern latitudes when there is not much sunlight Objectives: We will investigate whether VitD supplementation increases the MPS response to feeding and exercise, VitD storage in muscle cells, and cellular pathways that are involved in healthy sedentary or moderately active adults. Methods: Participants will consume either a placebo (sucrose) or the intervention (vitamin D3, 3000IU/day) for 12 weeks in a double-blinded randomised study. Before and after the intervention participants will have body composition measured. Blood and muscle samples will be taken before and after a bout of exercise and ingestion of 20 g protein in order to measure MPS.
NCT03694886
This study aims to assess if tablet size, due to placebo effect, alters participants' performance on cognitive tests after consuming caffeine. Participants will be randomly assigned to one of four groups: 1) 90 mg caffeine with a 1 mm diameter sucrose pillule; 2) no caffeine with the small sucrose pillule; 3) 90 mg caffeine with a 5 mm sucrose pillule; 4) no caffeine with the large sucrose pillule.
NCT03017534
The mechanism responsible for improvement following manual physical therapy techniques is unknown. Previous studies have indicated both biomechanical and neurophysiologic effects which may be responsible for clinical changes observed. Yet, other studies report clinical changes following sham interventions. Through a mixed-methods design, this study aims to gain more understanding of the social and contextual factors that may be related to the improvement often observed following manual therapy techniques.
NCT02578420
To date, very little is known about the mechanisms of open-label placebo treatment and there is a lack in highly controlled experimental designs. Therefore, the planned project will test well-established explanatory models of (deceptive) placebo, i.e., (1) expectancy, (2) meaning response, in an open-label placebo design, investigating their influence on placebo analgesia.
NCT01501591
The total effect of a medication is the sum of its drug effect, placebo effect (meaning response of placebo), and their possible interaction. Current interpretation of the results of clinical trials (the gold standard in evidence based medicine) assumes no such interaction. Using a novel cross-over balanced placebo design and caffeine as a model drug, the investigators have recently shown that a negative interaction does exist; suggesting that the size of drug effect as currently measured by clinical trials may not be accurate. Due to the novelty of the findings and their important clinical practice and research implications, they need to be confirmed using another drug; and the size of drug effect measured using the novel design need to be directly compared to that measured using conventional clinical trial design. The results of the study are expected to further our understanding of a widely used medical intervention, i.e., placebo, and help assess the appropriateness of randomized clinical trials in determining the size of drug effect.
NCT02578212
In the proposed study, investigators aim to investigate the role of interpersonal trust in the conditioned placebo analgesia process with healthy male subjects in a standardized experimental heat pain paradigm.