However, these positive effects occur only if the 'correct dose. If overheating can occur as a number of opposing negative processes with the advent of headaches, fatigue, drowsiness, irritability, burns, loss of appetite. Particular caution should be exercised elderly, fragile blood vessels. The best time for sunbathing are in the middle lane summer morning hours (7-11), in the spring and fall - noon (11-14 hours). On hot days, pleasant and useful to sunbathe with a light wind (3.2 meters per second). http://en.wikipedia.org/wiki/Weight_loss
Wind prevents overheating and burns, evaporating perspiration from the surface of the track. Sunbathing should be one and a half hours after a meal and stop the session for an hour before a meal. The first session of hardening the sun for people with fair skin should not last more than 5 to 10 minutes of dark-skinned. Subsequent sessions can be increased by 5-10 minutes, and so on until one and a half hours. Healthy people can sunbathe in divided doses up to a total duration of 2-3 hours per day.