A prefix is a series of letters, or a word, that is added to the  beginning of a word and changes the meaning. For example, in the  word midnight, mid is the prefix.
The more vigorous an activity, however, the more calories youâll burn. Changes in body weight are related to both the duration and intensity of play. Playing singles tennis at average intensity expends 300-600 kcal/h, while high intensity tennis training expends 450-900 kcal/h. Diabetes. The incidence of diabetes worldwide of persons aged 20 or above in 1995 was 4% (approx. 135 million), a figure that will increase to approx. 5.4% (300 million people) by 2025.
Those changeovers were 135 seconds long.â¢ Players were asked to maintain the same effort and intensity as they would in a tournament match and to use an all-court style of play. â¢ The physiological demands of a tennis match are not well understood because little research has been conducted on this topic. â¢ Although some studies have investigated pre-and post-play metabolic responses, there has been little documentation of measurements other than heart rate during actual play.