Introduction: Judo competitions are divided into body weight classes. In most cases, athletes reduce body weight in a short period before competitions. However several investigations have reported that athletes undergoing RWL presented decreased short-term memory, vigor, concentration and self-esteem as well as increased confusion, rage, fatigue, depression and isolation. On the other hand, there is only limited data about respiratory condition on rapid weight loss among judoists. Judoists who reduced quickly body weight dehydrate extremely because they restrict intake of water and food. Dehydration may cause reduction of the mucus secretion in upper respiratory mucous membrane. And drying of upper airway may evoke airway inflammation. Purpose: The purpose of this study is to examine that rapid weight loss affect a respiratory condition in judoists. Methods: 13 collegiate judoists participated in this study. And 8 judoists reduced their body weight about 10 days(RWL). 5 judoists kept their body weight (NWL). We investigated their history of respiratory symptoms, inflammation, resistance and function. The respiratory resistance at 5Hz (R5) and frequency of resonance (Fres) were measured by using forced oscillation technique. The pulmonary functions including forced expiratory volume in 1 second as percent of FVC (FEV1.0%(G)) were measured by spirometer. And fraction of exhaled nitric oxide (FeNO) was measured by a portable NIOX MINO. Judoists measured FeNO and body weight three times before competition. Result: Age of judoists was 20.3±0.9yr. Average height was 170.2±6.7 cm , and body weight were 76.3±14.1kg. There werent difference of physical characteristics, respiratory resistance and function in RWL and NWL. RWL reduced their body weight from 74.0±12.5 kg to 71.1±12.8kg. Four RWL increased FeNO after more than 4% body weight loss. FeNO didnt alter in NWL. Discussion: The 5% reduction in body mass affected metabolism and muscle contraction pattern, thereby increasing exposure to injury. 4 judoists who reduced more than 4% body weight, increased in their FeNO. Therefore, rapid body loss may affect respiratory condition. However, when they reduced less than 4% body weight, FeNO didnt alter in RWL, except one judoist. Respiratory conditions may get worse by more than 4% reduction in body weight. Conclusion: Respiratory conditions of judoists were worsened by more than 4% reduction in body weight.
© Copyright 2014 19th Annual Congress of the European College of Sport Science (ECSS), Amsterdam, 2. - 5. July 2014. Veröffentlicht von VU University Amsterdam. Alle Rechte vorbehalten. / Übersetzt mit https://www.DeepL.com/Translator