Laurels and Accolades
Marijuana impairs young brains, but fitness may help Neuropsychologist Krista Lisdahl recently completed a six-year study of brain functioning in teens and young adults who regularly smoke marijuana. It showed that smoking pot at least once a week changes a teenager’s thinking abilities.
of fitness and then compared their performance on neuropsychological tests. Participants abstained from marijuana smoking for three weeks before taking a test called VO2 max, which measured how efficiently they use oxygen during intense exercise
Moreover, the research confirmed findings of previous studies showing an association between chronic Krista Lisdahl pot-smoking and poorer working memory and slower processing speed.
Lisdahl found that high aerobic fitness, indicated by the VO2 score, was related to better performance of visual memory, verbal fluency and sequencing abilities.
“The more joints they smoked in the past year, the worse they did on the cognitive performance,” says Lisdahl, an associate professor of psychology. “These areas of cognition were still worse in the marijuana users compared to controls, even after they stopped using for three weeks.” The study stopped short of answering definitively whether people who smoked pot in their teens and early 20s permanently harmed their cognitive abilities. But it did show that aerobic fitness may protect against some of the cognitive damage that young marijuana users are inflicting on their still-developing brains. Lisdahl separated the study’s marijuana smokers by their levels
Most interestingly, aerobically fit marijuana users did better on the cognitive tasks such as processing speed, visual memory and sequencing ability compared to users who weren’t fit. Lisdahl notes that the study offers some health intervention possibilities. “We could take people who are trying to quit and offer a method to improve brain function while they are scaling back use,” she says. “It would be an inexpensive treatment option. “This could boost several other areas besides cognition,” Lisdahl continues, “because brain receptors for cannabis, called CB1 receptors, are involved in a lot of other functions besides enabling pot smokers to experience that high. These include emotional control, mood, cognition and pain tolerance.” Because most research on exercise involves older adults, the study also adds insight into the effects of aerobic fitness in young people. That’s important because activity levels of young adults drop dramatically after high school.
Pi Sigma Alpha is the national Political Science honors society. UWM’s Epsilon Xi Chapter was selected as one of Pi Sigma Alpha’s Best Chapters 2018-2019. The award honors chapters that are active in their universities and are energetic and creative in furthering the goals of the honors society. UWM’s chapter will receive a $500 cash prize. Pi Sigma Alpha will also donate a $200 check in chapter president Kristin Trenholm’s name. Sonia Khatchadourian (English) and Aragorn Quinn (Foreign Languages and Literature) were named UWM’s 2019-20 Fellows/ Scholars in the Wisconsin Teaching Fellows and Scholars Program. Khatchadourian and Quinn will complete professional development and a Scholarship of Teaching & Learning (SoTL) project they will share at the UW System’s Teaching and Learning Conference in April. Graduate student Giselle Pu (Communication) was awarded the Emerging Scholar Research Award in the Mobile Interest Group of the International Communication Association in May.
People in Print Mark L. Dietz (Chemistry and Biochemistry) and C.A. Hawkins. 2019. Task-specific ionic liquids for metal ion extraction: Progress, challenges, and prospects. In Ion Exchange and Solvent Extraction: Changing the Landscape in Solvent Extraction (ed. Bruce A. Moyer), CRC Press: 23 (83-113).
By Laura Otto, University Relations College of Letters & Science • UW–Milwaukee • 13
