The day before the colonoscopy
milk
The intervention group participants were supposed to eat a light breakfast at 8 a.m., without milk and other dairy products. From 8 a.m. to 12 p.m., they were allowed to drink only clear liquids in the amount of 8 to 10 glasses (such as water, tea, or lemon juice) and walk for 5 min. From 12 p.m. to 1 p.m., they were told to eat a light lunch (like a piece of cooked chicken with a slice of bread) and two bisacodyl pills and then walk for 5 min. Then the patients were not allowed to eat any solid food until the colonoscopy procedure. The patients were told to dissolve three packs of PEG in 3 L of water (approximately equivalent to 12 to 13 full glasses) drink about one glass of this solution (the first PEG solution) every 15 to 20 min from 3 p.m. and walk for 5 min.The participants were supposed to eat two other bisacodyl pills at 6 p.m. and walk for 5 min. After finishing the first PEG solution, our patients were allowed to drink clear liquids such as water, tea, and completely strained fruit juice as much as they wanted and walk for 5 min. After finishing the first PEG solution, they were allowed to rest for about 2 h. They were supposed to dissolve two other packets of PEG powder in two liters of water (about eight glasses) and then drink them (the second PEG solution) from 9 p.m. every 15 to 20 min and walk for 5 min. After finishing the second PEG solution, the patients were forbidden to eat or drink anything until the colonoscopy.The day before the colonoscopy for the control group was similar to the intervention group, but the participants were not told to walk.Patients were given smart bands (Mi band 2, Xiaomi) and monitored to assess the number of footsteps taken. An alert patient companion observed all steps of the protocol for each patient.