High-intensity interval training differentially modulates acute BDNF and cognitive responses in young adult males: a randomized crossover trial.
Level 2 - randomized trial
Randomized crossover trial
PubMed 42286197 · doi:10.1038/s41598-026-56739-4
What was done
Twelve healthy young adult males participated in a randomized crossover study with a 7-day washout period across four conditions: low-intensity continuous training (LICT), moderate-intensity continuous training (MICT), high-intensity interval training (HIIT), and a resting control condition. Serum brain-derived neurotrophic factor (BDNF), blood lactate concentration, and executive function (assessed via the Stroop Test) were measured immediately before and after each intervention.
What was found
The abstract does not provide exact numerical values, standard deviations, or p-values. It reports that HIIT induced significantly larger post-exercise increases in serum BDNF and blood lactate compared with LICT, MICT, and control. MICT produced moderate increases in BDNF and lactate compared to LICT and rest, with lactate scaling with exercise intensity. Statistically significant improvements in executive function (faster Stroop Test completion times) were observed exclusively after the HIIT condition.
Why it matters
This study indicates that the acute neurotrophic and cognitive responses to exercise are intensity-dependent, suggesting that high-intensity bouts may be uniquely effective for eliciting immediate improvements in executive function and BDNF elevation.
Limits
The sample size is very small (n = 12) and restricted exclusively to healthy young males, limiting generalizability to females, older demographics, or clinical cohorts. The abstract reports no numerical data, confidence intervals, or precise effect estimates. The study only examined immediate acute post-exercise effects without evaluating sustained cognitive or neurochemical changes, and the trial was registered retrospectively.
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