Evaluation of a brief interval exercise training (IET) intervention for first-time prisoners with elevated anxiety symptoms.

Exercise training has a history of alleviating anxiety in various populations, but research into its effects on prison inmates is limited. Confinement to prison is a highly distressing event for those who have never experienced incarceration, which can dramatically increase anxiety-related symptoms and may exacerbate suicidal risk. Thirty-seven first-time prisoners with elevated anxiety symptoms completed the State-Trait Anxiety Inventory before and after a 6-week long treatment period consisting of interval exercise training (IET;  = 20) or no intervention (waiting-list;  = 17). Prisoners in the IET intervention had to exercise three times per week (40 min per session) under the supervision of the first and/or second author. Exercise intensity was self-monitored using the Borg's RPE-15 scale, with targets in the range 13-15 ("somewhat hard"-"hard"). Those who received the IET intervention showed a significantly greater reduction in anxiety than prisoners in the waiting-list. The effect size for IET was of moderate-to-large magnitude (Cohen's  = -0.71). The authors conclude that the lower levels of anxiety reported following IET suggest that supervised exercise training is an effective coping strategy to deal with incarceration. ClinicalTrials.gov identifier: NCT04019171.