Subsequently, discussing research tools, most studies adopted multiple domain-specific cognitive measures. Marmeleira et al. (2009) applied 17 cognitive tests, and Smiley-Oyen et al. (2008) spent up to 90 minutes for cognitive tests. Be- cause of the need for a special computer or instruments for measuring, testing often took place in a laboratory rather than clinical setting. Such a complicating, time-consuming, and difficult implementation of cognitive tests in a scien- tific setting may obstruct observations of cognition in terms of the intended effects as well as disallow comparison of cog- nitive effects on various trials. Angevaren et al. (2008) recom- mended the development and use of a smaller battery of cognitive tests to render research on cognition transparent and heighten result reproducibility.Finally, 8 of the 12 trials (66.7%) demonstrated the positive effect of exercise on cognition when the exercise regimen lasted for 6 weeks and occurred at least three times per week for 30 minutes. This finding is similar to the one reported in the meta-analysis by Colcombe and Kramer (2003), whereby they concluded that 30-minute aerobic exercise enhanced the cognitive capacity of adults aged 65Y70 years.