Acute exercise has emerged as a modifier to multiple aspects of cognitive function; however, its effect on populations with different risks of Alzheimer's disease (AD) and the role of exercise variance and APOE genotype within the effect reminds underestimated. The current study aimed to examine the acute exercise effect on neurocognitive function from behavioral and neuroelectric perspectives among cognitively normal late-middle-aged adults. Additionally, we determined whether variations in exercise intensity and duration and the presence of the APOE ɛ4 allele modulated the effect.