Sex Differences in Response to Low- Versus High-Volume Aerobic Exercise for Sport-Related Concussion: A Pilot Randomized Controlled Trial.

This pilot study looked at how adolescent athletes responded to two different amounts of aerobic exercise after a sport-related concussion, paying specific attention to whether sex made a difference. Thirty-two young athletes (average age 15.6 years, one-third female) were enrolled within 10 days of injury and randomly assigned to either low or high-volume exercise over two weeks, alongside 28 uninjured controls. The researchers measured how fast each person's heart rate climbed during a standardized treadmill test, how well they stuck to their prescribed exercise, and how motivated and confident they felt about the program.

Female athletes showed a higher maximum heart rate on the initial test compared to males. Here's where things get interesting: females assigned to high-volume exercise appeared to take longer to recover than those given lower volumes, a pattern that didn't show up in males. The researchers also found that most of the females who struggled with exercise tolerance had to cut workouts short because their symptoms got worse, whereas this happened far less often in males facing similar challenges.

This study followed teenagers recovering from sports concussions to understand how exercise helps them get better, and whether the amount of exercise matters differently for girls and boys. Young athletes with concussions did the exercise program in their homes over two weeks, with some given more intense or frequent sessions than others.

The main surprise was that girls given higher amounts of exercise tended to take longer to recover than those given less exercise, while boys didn't show this pattern either way. Girls were also more likely to have their symptoms flare up during exercise, which sometimes meant they had to stop and rest.

Both girls and boys felt similarly motivated to complete the program and felt confident doing it. While this study was small and exploratory, it suggests that when exercise is prescribed after a concussion, the right amount for each person might be especially important for girls, and that what works for one person might not work the same way for another.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This pilot study examined how adolescent athletes with sport-related concussion tolerated individualized aerobic exercise, with sex-stratified randomization revealing some preliminary patterns worth noting. Females achieved significantly higher heart rate thresholds on the Buffalo Concussion Treadmill Test at baseline, which may have influenced how the researchers set exercise intensities for the high-volume group.

The key finding was a nonsignificant trend toward faster recovery in females receiving low-volume versus high-volume exercise, absent in males. More striking was the sex difference in exercise tolerance: 88% of females who were exercise-intolerant experienced symptom exacerbation requiring early session termination on one or more days, compared to 17% of similar males.

This exploratory data suggests that either higher prescribed intensities based on initial heart rate thresholds, symptom reactivity during home-based exercise, or both may have influenced female exercise behavior and recovery timelines differently than in males. The study demonstrates feasibility of this intervention approach but is underpowered to make definitive effectiveness claims.

It signals a need for larger, adequately powered trials to examine whether exercise prescription strategies should be sex-differentiated in this population.