Angela Bryan

Research

Bryan's research applies a biopsychosocial model of health behavior to a variety of topics including HIV/STD prevention, cannabis use, and exercise. In her HIV and STD prevention work, she has examined the influence of a situational variable—alcohol use during sexual activity—as a factor impacting condom use among at-risk young people. In an initial study, Bryan and her colleagues found that alcohol use was unrelated to condom use in males but was strongly and negatively associated with condom use among females. Bryan was interested in testing a higher risk population and decided to focus on criminally involved adolescents. In comparison to other adolescents in the general population, adolescents involved with the criminal justice system tend to be younger at the age of first sexual intercourse, and have more sex partners, lower rates of condom use, and higher rates of unintended pregnancy, HIV, and STDs. In this high-risk population, Bryan and her colleagues failed to find evidence that alcohol use influenced adolescents' intentions, attitudes, and behaviors around condom use.

Another line of work has explored effects of cannabis on motor functions. Legalization of cannabis has led to increased rates of driving under the influence. Although numerous studies indicate that cannabis impairs psychomotor and neurocognitive functions that can affect driving ability, determination of driving risk is complicated by the extent to which cannabis users develop tolerance to THC. In her study, Bryan and her colleagues used a mobile app to assess the psychomotor and cognitive functioning of frequent cannabis users immediately and one hour after engaging in cannabis use. They found clear evidence of psychomotor impairments immediately after cannabis use, but found that the impairments decreased significantly one hour after use.

Bryan's research on cannabis is not easily obtainable because Marijuana remains fully illegal at the federal level, and strict federal access policies tie the hands of researchers Bryan hopes to start filling the research gap on the topic as it gains popularity. In order for Bryan to get much needed data on the topic, she is not able to be present during participants consumption. The only way she can study effects is by using a mobile lab and asking participants to come outside to the van for tests of how its active ingredients, called cannabinoids, have affected them. The van is helping to facilitate several studies; among them are the effects of various cannabis products on anxiety, pain, inflammation, sleep, health and mood. Bryan hopes to study cannabis and metabolism, including its effects on the body's response to insulin.

In other notable work, Bryan and her collaborators surveyed cannabis users living in states with full legal access to find out whether cannabis use shortly before and/or after exercise affects enjoyment of and motivation to exercise. The researchers were specifically interested in comparing users who consumed cannabis shortly before or after exercise (co-users) with those who did not. They designed a simple questionnaire that asked people general questions about themselves, their marijuana use, and working out. Almost 82% of participants reported that they used cannabis around the time of their workouts. These individuals tended to be younger and more often male than those who did not use marijuana in conjunction with exercise. After controlling for these differences, co-users reported engaging in more minutes of exercise per week than non-users, while also reporting greater enjoyment of exercise and increased motivation to exercise. The study did not look at which kind of cannabis (edibles, smoked flower, etc.) people use alongside exercise, however, more research is already in the works at CU Boulder, comparing the activity levels of older adults who use cannabis with those who do not.

Bryan's interest in life-style research led her into studies of the effects incentives might have on healthy eating. Her team had participants record their stress levels and the number of fruit and vegetable servings they ate each day for three weeks. One group received a dollar each time they ate a serving of fruit or vegetables, the other did not. On days when subjects reported feeling stressed, those who were being paid maintained their intake while those who weren't ate fewer servings of fruits and vegetables. Participants who received cash incentives maintained their daily fruit and vegetable consumption, even when stressed. Her studies suggest that incentives may be a novel method for buffering against the negative effect of daily stress on eating a healthy diet.

Representative publications

• Bryan, A. D., Aiken, L. S., & West, S. G. (1996). Increasing condom use: evaluation of a theory-based intervention to prevent sexually transmitted diseases in young women. Health Psychology, 15 (5), 371–382.
• Bryan, A. D., Aiken, L. S., & West, S. G. (1997). Young women's condom use: The influence of acceptance of sexuality, control over the sexual encounter, and perceived susceptibility to common STDs. Health Psychology, 16 (5), 468–479.
• Bryan, A., Rocheleau, C. A., Robbins, R. N., & Hutchinson, K. E. (2005). Condom use among high-risk adolescents: testing the influence of alcohol use on the relationship of cognitive correlates of behavior. Health Psychology, 24(2), 133–142.
• Kwan, B. M., & Bryan, A. D. (2010). Affective response to exercise as a component of exercise motivation: Attitudes, norms, self-efficacy, and temporal stability of intentions. Psychology of Sport and Exercise, 11 (1), 71–79.
• Robbins, R. N., & Bryan, A. (2004). Relationships between future orientation, impulsive sensation seeking, and risk behavior among adjudicated adolescents. Journal of Adolescent Research, 19(4), 428–445.