A 2011 study by Appalachian State University found that starting your walk by 7 a.m. could lead to lower blood pressure and better nighttime sleep patterns than people who walk in the middle of the day or in the evening. The study participants who walked in the morning had a 10 percent decrease in blood pressure throughout the day and a 25 percent decrease at night, even though it had been more than 12 hours since they exercised Evening Exercise
In the evening, your muscles have had all day to warm up. This can make your evening exercise more efficient by allowing you to add more power to your walk. A 2009 study by the University of Alberta found that people who are more alert in the evenings, often called night owls, tend to grow stronger throughout the day, peaking in the late evening. If you plan to power walk in the evening after dinner, give your body about two hours to digest the food. Vigorous exercise can cause your muscles to compete with the blood flow your body diverts to your digestive tract immediately after eating, making your workout and your digestion less effective. If you eat a small or medium-sized meal and plan to walk briskly but not at 100 percent of your capacity -- closer to 65 to 75 percent capacity -- walking right after eating shouldn't be a problem with most people.