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Walking before study enhances free recall but not judgement-of-learning magnitude

The authors investigated whether a brief bout of aerobic exercise can influence subsequent judgements of learning (JOLs) or memory performance. 80 college students (46 women and 34 men) completed 1 of 4 conditions using a 2×2 (encoding condition×retrieval condition) between-subjects factorial design. After a practice task, students either viewed an unrelated slide show while sedentary or completed a brisk 10-minute walk. Then, all students studied 30 English nouns and provided immediate JOLs. Finally, students again completed either the sedentary activity or exercised, followed by a free recall test. Exercise before encoding increased free recall scores by 25% compared with the sedentary condition; as a result, absolute metamemory accuracy also improved. Encoding condition did not influence mean JOLs, however, suggesting that students were unaware of the memory benefits from exercise. Overall, these results suggest that individuals can gain a memory advantage from a 10-minute walk before studying.