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Publication Open Access Effect of respiratory muscles warm-up on exercise performance in sedentary subjects(2010-01) Juthamard Kantasorn; Wattana Jalayondeja; Rungchai Chaunchaiyakul; Chakarg Pongurgsorn; Mahidol University. Faculty of Physical therapy; Mahidol University. College of Sports Science and Technology; Mahidol University. Faculty of Medicine Siriraj Hospital. Department of Rehabilitation MedicinePublication Metadata only Do current sports brassiere designs impede respiratory function?(2005-09-01) Kelly Ann Bowles; Julie R. Steele; Rungchai Chaunchaiyakul; University of Wollongong; Mahidol Universityof resting and submaximal respiration. However, no significant difference was found between the no brassiere and brassiere conditions in regards to measured lung volumes. Conclusions: As no significant restriction to exercise performance or respiratory... to be too tight around the torso, possibly impeding their performance during physical activity. The purpose of this study was to determine whether breast hypertrophy, breast momentum, and/or wearing a sports brassiere impeded respiratory function at restPublication Metadata only Acute physiological responses in pregnant women during exercises in different positions(2019-05-04) Rungchai Chaunchaiyakul; Metta Pinthong; Amornpan Ajjimaporn; Mahidol University© 2018, © 2018 Taylor & Francis. Objective: This study measured acute physiological responses in pregnant women during short duration exercise in the supine (Sup), side-lying (Side), sitting (Sit), and standing (Std) positions. Methods: In a... cross-sectional study, 42 healthy pregnant women were divided into 3 groups of 14 persons each: G1, G2, and G3 (first, second, and third trimester, respectively). Baseline assessments were performed following a 30-min rest in the sitting positionPublication Open Access Home-based walking program increases leg muscle strength in hemodialysis patients(2011-05) Orawan Ponngeon; Rungchai Chaunchaiyakul; Kriengsak Vareesangthip; Dusit Lumlertgul; Sumalee Nakum; Wattana Jalayondeja; Mahidol University. Faculty of Physical Therapy; Mahidol University. Faculty of Medicine Siriraj Hospital; Mahidol University. College of Sports Science and Technologyexercise program to improve their abilities to perform activities of daily living... strength was meas ured using a back and leg dynamometer pr ior to and at the 4th, 8th, and 12th weeks of the study period in both groups. The trai ning group performed the home- based walking program, an individually prescribed walking progra m whichPublication Metadata only Reference values and predictive equations for cardiopulmonary exercise testing in thai adults(2020-01-01) Prapaporn Pornsuriyasak; Kitipong Ngaojaruwong; Suchada Saovieng; Jayanton Patumanond; Khanat Kruthkul; Rungchai Chaunchaiyakul; Faculty of Medicine, Ramathibodi Hospital, Mahidol University; Mahidol University; Chiang Mai University© 2020, Asian Journal of Sports Medicine. Background: A series of racial specific predictive equations for exercise parameters are needed to determine a lack of cardiopulmonary fitness or having an exercise limitation on cardiopulmonary exercise... testing (CPET). Objectives: The study aimed to develop a new set of predictive equations of CPET parameters during maximal cycling exercise for Thai adults. Methods: A sample of 580 Thai adults whom could pass screening tests were asked to fill a healthPublication Open Access Lactose-free milk prolonged endurance capacity in lactose intolerant Asian males.(2014) Kriyot Sudsa-ard; Kallaya Kijboonchoo; Visith Chavasit; Rungchai Chaunchaiyakul; Amanda Qing Xia Nio; Mahidol University. Faculty of NutritionSeveral studies on Caucasian volunteers have proven that milk is an effective recovery drink for athletes. Such benefit, however, cannot be directly applied to the lactose-intolerant Asian population. This study investigated the effects of ingesting water (WT), sports drink (SPD) and lactose-free milk (LFM) on cycling capacity. METHODS: Ten healthy young men completed 3 randomized experimental trials. Each trial consisted of an intermittent glycogen depleting session, a 2 h recovery period during which they ingested the test drink, followed by cycling at 70% of their maximum oxygen consumption (VO2max) to volitional exhaustion. Each trial was separated by at least one week. RESULTS: There were no complaints or symptoms of lactose intolerance during any of the trials. The cycling periods were different (p < 0.05) amongst the 3 trials, namely, lactose-free milk (LFM; 69.6 ± 14.0 min), sports drink (SPD; 52.1 ± 11.6 min), and water (WT; 36.0 ± 11.1 min), respectively. The VO2 and VCO2 of LFM (30 ± 4 and 29 ± 4 ml/kg/min) were lower (p < 0.05) than that of SPD (34 ± 4 and 34 ± 4 ml/kg/min) and WT (35 ± 4 and 33 ± 5 ml/kg/min). There were no differences (p = 0.45) in VO2 and VCO2 between SPD and WT. Mean rating of perceived exertion was lowest in LFM (14 ± 5; p < 0.05), while no difference was found between the other two trials (SPD: 16 ± 4 and WT: 16 ± 4; p = 0.18). CONCLUSION: Lactose-free milk is likely to be an effective recovery drink for enhancing subsequent cycling capacity in lactose intolerant Asian males.Publication Metadata only The impact of aging and habitual physical activity on static respiratory work at rest and during exercise(2004-12-01) Rungchai Chaunchaiyakul; Herb Groeller; John R. Clarke; Nigel A.S. Taylor; University of Wollongong; Mahidol University; Navy Experimental Diving UnitWe investigated the effects of aging on the elastic properties of lung tissue and the chest wall, simultaneously quantifying the contribution of each component to static inspiratory muscle work in resting and exercising adults. We further evaluated... resting and exercising tidal volume excursions. Elastic work of the lung (Y = 0.79 ± 0.05; M = 0.47 ± 0.05; O = 0.43 ± 0.05 J·l-1) and chest wall (Y = -0.49 ± 0.06; M = -0.12 ± 0.07; O = 0.04 ± 0.05 J·l-1) changed significantly with age (P < 0Publication Metadata only Effect of Cold Shower on Recovery From High-Intensity Cycling in the Heat(2019-08-01) Amornpan Ajjimaporn; Rungchai Chaunchaiyakul; Sirikun Pitsamai; Waree Widjaja; Mahidol University; Institute of Physical Education Phetchabun), core temperature (Tc), salivary cortisol, and thermal comfort sensation (TCS) after exercise in the heat. Nine healthy male subjects (age, 21 ± 1 year) performed 45 minutes of cycling in a hot environment (35° C, 40-60% relative humidity) at 65% of peak...Ajjimaporn, A, Chaunchaiyakul, R, Pitsamai, S, and Widjaja, W. Effect of cold shower on recovery from high-intensity cycling in the heat. J Strength Cond Res 33(8): 2233-2240, 2019-Post-exercise cooling, e.g., cold water immersion has shownPublication Metadata only Home-based walking program increases leg muscle strength in hemodialysis patients(2011-07-06) Orawan Ponngeon; Rungchai Chaunchaiyakul; Kriengsak Vareesangthip; Dusit Lumlertgul; Sumalee Nakum; Wattana Jalayondeja; Mahidol University; Chiang Mai University; Maharaj Nakorn Chiang Mai Hospitalstrength was measured using a back and leg dynamometer prior to and at the 4th, 8th, and 12th weeks of the study period in both groups. The training group performed the home-based walking program, an individually prescribed walking program which...). [Conclusion] A homebased walking exercise program improved lower extremity muscle strength of hemodialysis patients. Patients who have stable medical conditions should be encouraged to participate in this home-based walking exercise program to improvePublication Metadata only Effect of ad libitum intake of lactose-free milk on subsequent performance of collegiate badminton athletes(2019-09-01) Marla Frances T. Mallari; Alisa Nana; Metta Pinthong; Saiphon Kongkum; Rungchai Chaunchaiyakul; Christian Wisdom Valleser; University of the Philippines Diliman; Mahidol Universityon performance in badminton. This study therefore aimed to investigate the effects of ad libitum intake of low-fat lactose-free milk (LFM) on subsequent performance of badminton athletes. Eleven collegiate badminton athletes (Mean ± standard deviation for Age...), carbohydrate-electrolyte sports drink (CE) or water (CON). Performance tests were measured before and after subsequent games. Other variables measured included hydration status, perceived recovery and selected subjective perceptions. Palatability and amount