Investigating the Anxiolytic Effects of Aerobic Exercise for the Treatment of Posttraumatic Stress Disorder
Abstract
Preliminary evidence has demonstrated the anxiolytic capabilities of aerobic exercise;
however, the treatment potential for posttraumatic stress disorder (PTSD) has received
comparably less attention. Aerobic exercise may work similar to interoceptive exposure
therapy–an empirically supported treatment for PTSD–but this hypothesis has received
scarce empirical attention. The current study investigated the therapeutic potential (i.e.,
whether or not PTSD symptoms, anxiety sensitivity [AS], and depressive symptoms
would decline) and mechanisms (i.e., whether or not therapeutic benefit is changed by
increasing or decreasing interoceptive awareness) of a brief aerobic exercise program for
individuals with PTSD. Thirty-three participants (Mage=36.9 years; 76% female; 18%
drop-out rate) with PTSD were recruited from the surrounding community and completed
two weeks of aerobic exercise (six sessions) on a stationary bike. Participants were
randomized into three groups to direct their cognitive focus during exercise, thereby
testing hypothesized therapeutic agents; group one (cognitive distraction) watched a
nature documentary, group two (exercise only) exercised in silence with no distractions,
and group three (interoceptive exposure) received interoceptive prompts. Data was
collected at pre-treatment, after each exercise session, and one week and one month after
treatment ended. Hierarchal linear modeling indicated that each variable decreased
significantly in a quadratic fashion; specifically, scores tended to reduce steadily from
baseline to their lowest point after the last exercise session and steadily rose during the
follow-up period. The effect of group membership was largely not statistically
significant, whereas the interaction between time and group membership was significant
among hyperarousal symptoms, fear of physical sensations, and fear of socially observable symptoms. In cases where interactions were present, between group
comparisons suggested that the interoceptive prompts group consistently reported less
change on primary outcome variables than the remaining groups. Given that the decline
in outcome variables was present in each of the three study groups, results suggest that
aerobic exercise is effective regardless of cognitive focus during exercise.
Notwithstanding, given the subjacent impact of the intervention among interoceptive
exposure group participants, anxiolytic properties of aerobic exercise may be accented in
the short term by employing strategies to detract from the discomfort of the exercise
protocol.