http://www.umass.edu/physicalactivity/newsite/publications/Dinesh%20John/papers/5.pdf "The results of the current study indicate that walking
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while working decreases scores on tests of typing and
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mouse proficiency, and math solving ability by approxi-
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mately 6 to 11%. This may be because the added task of
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walking puts an increased load on both mental process-
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ing and motor control.-^-^ An increased load causes
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interference in 1 or both tasks, thereby lowering task
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performance.^"
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Significantly lower (P < .05) peribrmances on fine
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motor movement tests during the walking condition"
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0121309 "Walking on a treadmill desk may result in a modest difference in total learning and typing outcomes relative to sitting, but those declines may not outweigh the benefit of the physical activity gains from walking on a treadmill."
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0237348 " Findings suggest active workstations, whether walking or cycling, are useful to improve physical activity, particularly when completing tasks that do not require verbal memory recall."