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Transcranial infrared laser stimulation is a non-invasive neuromodulation technique. The study will examine the effect of transcranial infrared laser stimulation on cardiovascular and metabolic responses to stress.
Emerging evidence supports the existence of a microbiota-gut-brain axis through which gut microbes influence cognition, mood and behavior. Targeting this axis with probiotics and/or prebiotics may provide novel strategies for mitigating stress-induced decrements in gastrointestinal and cognitive function. This double-blind, placebo-controlled, randomized, parallel-arm trial will determine the effects of a prebiotic and a probiotic dietary intervention on gastrointestinal, cognitive and physiologic responses to acute military-relevant physical and cognitive stress. Healthy men and women will be recruited and randomized to receive a placebo, probiotic or prebiotic for 4wk. Volunteers will be fed a controlled diet during the 4th week of supplementation. Fecal, blood, urine and saliva samples will be collected. Physical stress will be induced by a weighted walk on a treadmill, and will be followed by a cognitively challenging testing scenario that uses intermittent electric shocks to the abdomen to induce a stress response.
The purpose of this study is to see if it is possible (feasible) to introduce a behavioral intervention for family members affected by a relative's misuse of drugs and/or alcohol in the United States. The intervention is called the 5-Step Method. It will be a randomized control trial, with a total of 36 participants, and 18 in each group. The study lasts for approximately 12 weeks for the participant. The intervention group will receive a self-help handbook of the 5-Step Method, and the control group will not. Although the control group will not receive an intervention from the research team, they are allowed to look for and use any currently available program for affected family members (for example, Al-Anon, or Nar-Anon) during the study period. The study is being done because the 5-Step Method has not been used or evaluated in the U.S. (or the creators are unaware that it is in use here). There are two aims (objectives): (1) to see if it is feasible to introduce the 5-Step Method into the U.S.; (2) to look at trends in the baseline and followup survey scores to see if there is evidence of preliminary participant response.
The goal of this observational study is to learn about the relationship between environmental structural racism and discrimination and chronic pain risk in Native American adults. The main questions it aims to answer are: 1. How does environmental structural racism and discrimination affect chronic pain-promoting mechanisms in Native Americans? 2. What psychosocial factors buffer the negative effects of environmental structural racism and discrimination on chronic pain-promoting mechanisms?
Research has shown that activation of the sympathetic nervous system for extended periods or during certain times in life can increase the risk for Alzheimer's disease. Some research in animal models show that acute activation of the sympathetic nervous system through stress exposure can increase certain Alzheimer's disease-related biomarkers, such as amyloid-beta, within hours of exposure. However, how acute sympathetic nervous system activation via stress exposure affects amyloid-beta levels in humans has yet to be examined. In this study, the investigators will examine whether brief increases in sympathetic activation result in immediate changes in plasma amyloid-beta levels in the five hours after exposure.