School of Exercise and Nutrition Sciences, Deakin University, Burwood 3125, Australia.
Appl Ergon. 2012 May;43(3):532-40. doi: 10.1016/j.apergo.2011.08.007. Epub 2011 Sep 9.
Wildfire fighters are known to report to work in a hypohydrated state, which may compromise their work performance and health.
To evaluate whether ingesting a bolus of fluid before the shift had any effect on firefighters' fluid consumption, core temperature, or the time they spent in high heart rate and work activity zones when fighting emergency wildfires.
Thirty-two firefighters were divided into non-bolus (AD) and pre-shift drinking bolus (PS, 500 ml water) groups.
Firefighters began work hypohydrated as indicated by urine colour, specific gravity and plasma osmolality (P(osm)) results. Post-shift, firefighters were classified as euhydrated according to P(osm) and hypohydrated by urinary markers. No significant differences existed between the drinking groups in pre- or post-shift hydration status, total fluid intake, activity, heart rate or core temperature.
Consuming a bolus of fluid, pre-shift provided no benefit over non-consumption as both groups had consumed equivalent ad libitum volumes of fluid, 2.5 h into the shift. No benefits of bolus consumption were observed in firefighter activity, heart rate response or core temperature response across the shift in the mild weather conditions experienced. Ad libitum drinking was adequate to facilitate rehydration in firefighters upon completion of their emergency firefighting work shift.
众所周知，野火消防员在脱水状态下工作，这可能会影响他们的工作表现和健康。
评估在轮班前摄入一次液体负荷是否对消防员的液体摄入、核心体温或在紧急野火中战斗时花费在高心率和高工作活动区的时间有任何影响。
将 32 名消防员分为非液体负荷（AD）和预班饮水负荷（PS，500ml 水）组。
消防员开始工作时出现脱水，表现为尿液颜色、比重和血浆渗透压（P(osm)）结果。轮班后，根据 P(osm)和尿标志物，消防员被归类为正常水合状态或脱水。在轮班前或轮班后，饮水组在水合状态、总液体摄入、活动、心率或核心体温方面没有显著差异。
在轻度天气条件下，轮班前摄入一次液体负荷并没有比不摄入更好的效果，因为两组在轮班 2.5 小时后都摄入了等量的自由液体。在轮班期间，摄入液体负荷对消防员的活动、心率反应或核心体温反应没有任何益处。在完成紧急消防工作轮班后，自由饮水足以促进消防员的再水合。
