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Medicine & Science in Sports & ExercisePost Acceptance: July 12, 2016Introduction: In previous work, acute high-intensity aerobic exercise benefited continuous motor sequence task learning. As memory processes underlying motor sequence learning vary between tasks involving continuous and discrete movements, the objective of the current study was to determine if the beneficial effects of acute aerobic exercise generalize to the learning of a discrete motor sequence task.Methods: Sixteen young healthy individuals practiced a discrete motor sequence task preceded by either a period of rest or a bout of high-intensity cycling. Participants moved a cursor with a computer mouse to a series of discretely-presented targets on a screen. Target presentation followed either a repeated or random sequence, which allowed evaluation of implicit sequence-specific motor learning. Change in movement response time over practice ([INCREMENT]-ACQ) and from practice to a 24-hour 'no-exercise' retention test ([INCREMENT]-RET), as well as rate of improvement over practice ([alpha]-ACQ) and during the retention test ([alpha]-RET) were calculated.Results: [alpha]-RET was greater for the repeated sequence than random sequences following aerobic exercise (p = .01), but not rest (p = .33). Further, [alpha]-RET for the repeated sequence was greater following aerobic exercise than for either sequence (repeated, random) in the rest condition (p <= .01). There were no differences between sequences and/or conditions for [INCREMENT]-ACQ, [INCREMENT]-RET or [alpha]-RET (p >= .57).Conclusion: Our findings show a positive effect of acute high-intensity aerobic exercise on implicit discrete motor sequence learning. Performing exercise prior to practice increased the rate of improvement at a 24-hour delayed retention test, suggesting an impact on the rate of motor memory retrieval. Pairing acute aerobic exercise with motor practice may facilitate learning of discrete movement sequences in sport or rehabilitation settings.(C) 2016 American College of Sports MedicineHigh-Intensity Aerobic Exercise Enhances Motor Memory Retrieval.Mang Cameron S; Snow, Nicholas J; Wadden, Katie P; Campbell, Kristin L; Boyd, Lara AOriginal Investigation: PDF OnlyPublish Ahead of Print