“…14,20 Regard to observational data, this fact is less clear and needs further study. Briefly, the past research is mix and inconclusive, wherein some investigations found a positive relationship between some PA intensities (vigorous or MVPA) to academic performance, [33][34][35][36] others showed that association mediated via other variables, 31,37 others found no association 30,[38][39][40][41][42] or even a negative link. 43,44 Additionally, some studies have considered the joint effect of the MVPA, 29,35,38,40,42,45 and others have distinguished between different PA intensity levels.…”