title: Effects of active drinking practices on fluid consumption and sweat rate while exercising in a hot environment.
abstract: OBJECTIVE
  To examine the effects of active drinking practices on fluid consumption and sweat rate while exercising in a hot environment.
  
  
  METHODS
  Nine men completed two experiments. Each consisted of 3 phases: pre-testing (pre), training period, and post-testing (post). During testing, the subjects ran on a treadmill at a moderate intensity for 90 min at 39 ± 1℃ followed by a 3-h recovery. They drank ad libitum. During training, they ran for 90 min for 7 days while either drinking actively (AH, 150% of weight loss) or passively (PH, 50% of weight loss).
  
  
  RESULTS
  The actual volume consumed in training was three times greater during AH than during PH. In post during AH, the volume of drinking was two times greater than pre (1592 ± 953 and 855 ± 551 mL, respectively; p < 0.05). No difference in volume consumption during PH between pre and post was found. The sweat loss during exercise was greater in post (1377 ± 956 mL) than in pre (558 ± 642 mL) during AH (p < 0.05), but not during PH. Rectal temperature and heart rate decreased after training. Serum osmolality following exercise were not different than the baseline or between the conditions.
  
  
  CONCLUSIONS
  Active drinking practices while exercising in a hot environment induced greater voluntary fluid intake and sweat loss.
authors.affiliation: Exercise Physiology Laboratory, College of Physical Education, Kookmin University, 77 Jeongneung-ro, Songbuk-gu, Seoul 136-702, Republic of Korea.
authors.forename: Youn Sun
authors.initials: YS
authors.lastname: Son
authors.affiliation: Exercise Physiology Laboratory, College of Physical Education, Kookmin University, 77 Jeongneung-ro, Songbuk-gu, Seoul 136-702, Republic of Korea.
authors.forename: Bong Yeon
authors.initials: BY
authors.lastname: Hwang
authors.affiliation: Exercise Physiology Laboratory, College of Physical Education, Kookmin University, 77 Jeongneung-ro, Songbuk-gu, Seoul 136-702, Republic of Korea.
authors.forename: Dae Taek
authors.initials: DT
authors.lastname: Lee
authors.affiliation: MediPlus Solution, 15 Macheon-ro 8-gil, Songpa-gu, Seoul, Republic of Korea.
authors.forename: Yoon Jung
authors.initials: YJ
authors.lastname: Bae
keywords: rehydration; thermoregulation; voluntary intake