Xiang Ren Tan1, Ivan Cherh Chiet Low2, Chris Byrne3, Ru Wang4, Jason Kai Wei Lee5. 1. Health and Social Sciences Cluster, Singapore Institute of Technology, Singapore; Human Potential Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. 2. Human Potential Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. 3. Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, UK. 4. School of Kinesiology, Shanghai University of Sport, China. 5. Human Potential Translational Research Programme, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Department of Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore; Global Asia Institute, National University of Singapore, Singapore; N.1 Institute for Health, National University of Singapore, Singapore; Institute for Digital Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore. Electronic address: phsjlkw@nus.edu.sg.
Abstract
OBJECTIVES: The ACSM recommends drinking to avoid loss of body mass >2% during exercise to avert compromised performance. Our study aimed to assess the level of dehydration in elite runners following a city marathon in a tropical environment. DESIGN: Prospective cohort design. METHODS: Twelve elite runners (6 males, 6 females; age 24-41 y) had body mass measured to the nearest 0.01kg in their race attire immediately before and after the 2017 Standard Chartered Singapore Marathon 2017. Body mass change was corrected for respiratory water loss, gas exchange, and sweat retained in clothing, and expressed as % of pre-race mass (i.e. % dehydration). RESULTS: Data are expressed as means±SD (range). Dry bulb temperature and humidity were 27.9±0.1°C (27.4-28.3°C) and 79±2% (73-82%). Finish time was 155±10min (143-172min). Male runners finishing positions ranged from 2-12 out of 7627 finishers, whilst female runners placed 1-8 out of 1754 finishers. Body mass change (loss) and % dehydration for all runners were 2.5±0.5kg (1.8-3.5kg) and 4.6±0.9% (3.6-6.8%). Male runners experienced body mass loss of 2.8±0.5kg and 4.9±1.2% while females experienced body mass loss of 2.1±0.2kg and 4.3±0.6%. CONCLUSIONS: Despite experiencing dehydration (4.6% body mass loss) two-fold higher than current fluid replacement guidelines recommend (≤2%), elite male and female runners performed successfully and without medical complication in a hot weather marathon.
OBJECTIVES: The ACSM recommends drinking to avoid loss of body mass >2% during exercise to avert compromised performance. Our study aimed to assess the level of dehydration in elite runners following a city marathon in a tropical environment. DESIGN: Prospective cohort design. METHODS: Twelve elite runners (6 males, 6 females; age 24-41 y) had body mass measured to the nearest 0.01kg in their race attire immediately before and after the 2017 Standard Chartered Singapore Marathon 2017. Body mass change was corrected for respiratory water loss, gas exchange, and sweat retained in clothing, and expressed as % of pre-race mass (i.e. % dehydration). RESULTS: Data are expressed as means±SD (range). Dry bulb temperature and humidity were 27.9±0.1°C (27.4-28.3°C) and 79±2% (73-82%). Finish time was 155±10min (143-172min). Male runners finishing positions ranged from 2-12 out of 7627 finishers, whilst female runners placed 1-8 out of 1754 finishers. Body mass change (loss) and % dehydration for all runners were 2.5±0.5kg (1.8-3.5kg) and 4.6±0.9% (3.6-6.8%). Male runners experienced body mass loss of 2.8±0.5kg and 4.9±1.2% while females experienced body mass loss of 2.1±0.2kg and 4.3±0.6%. CONCLUSIONS: Despite experiencing dehydration (4.6% body mass loss) two-fold higher than current fluid replacement guidelines recommend (≤2%), elite male and female runners performed successfully and without medical complication in a hot weather marathon.
Authors: Juthamard Surapongchai; Vitoon Saengsirisuwan; Ian Rollo; Rebecca K Randell; Kanpiraya Nithitsuttibuta; Patarawadee Sainiyom; Clarence Hong Wei Leow; Jason Kai Wei Lee Journal: Nutrients Date: 2021-04-20 Impact factor: 5.717
Authors: Thomas A Deshayes; Nicolas Daigle; David Jeker; Martin Lamontagne-Lacasse; Maxime Perreault-Briere; Pascale Claveau; Ivan L Simoneau; Estelle Chamoux; Eric D B Goulet Journal: Nutrients Date: 2021-12-15 Impact factor: 5.717