Run, but when?

    Running is always fun and usually good for health. However, from a scientific stand of point, choosing the suitable running time is significant for this activity.

    

    The best time of day to run is a long-standing debate among runners and it is not a easy task to answer this question. Actually, the best choice of running time depends on different people because each one's situation is different. Generally speaking, late afternoon, which is between 4 and 7 p.m, is better than early in the morning because the viscosity of carbon dioxide in the morning is larger than that in dusk. In addition, in the morning, the dirt in the air is also bad for runners' health. Furthermore, the blood pressure is higher compared with that in the evening so it is important to try to avoid running in the morning, especially for those with a high blood pressure.

    

    Another reason to choose running at dusk is that metabolism effect of human body is strongest in the afternoon and early evening. So running during this time is best for exercise of the body. However, if the aim of exercise is merely losing weight, the best time of running might be morning before breakfast. It is because in the morning the blood sugar level is the lowest in a day. When blood sugar level is low, the body would first turn to the sugar stored in the liver and then turn to burn fat instead quickly as the primary energy source. So exercise before breakfast would help burn fat more easily and efficiently at this point of time. And there is a potential benefit of running in the morning. Scientific study shows that running exercise in the morning correlates with better sleep. Running in the morning can result in better sleep quality that running the evening.

    

    Still, there are a large amount of runners choose to run late in the evening, which is not usually considered as a good exercise time, as this time works best with their personal schedules. And their health still benefit from the running exercise. Anyway, some running, whenever it takes place, is better than no running at all. It is prominent to find running time that best works with individual's personal schedule so runners can take advantage of his/her time, no matter what time of day he/she runs, so the runner would get all the benefits of running. It is also important to establish a routine of running so the human body can get used to running at a specific time. And the runner can accustomed to the routine of wake up, drink, eat, which also help lead to a healthier life.

Source:

http://www.runnersworld.com/race-training/morning-noon-or-night?page=single

http://running.about.com/od/motivation/f/Whats-The-Best-Time-Of-Day-To-Run.htm

http://www.alajoo.com/questions/when-is-the-best-time-to-start-running-in-the-morning/