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Physiological response to firefighting activities of various work cycles using extended duration and prototype SCBA

机译:使用延长的持续时间和SCBA原型对各种工作周期的消防活动的生理响应

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Firefighters' self-contained breathing apparatus (SCBA) protects the respiratory system during firefighting but increases the physiological burden. Extended duration SCBA (30min) have increased air supply, potentially increasing the duration of firefighting work cycles. To examine the effects of SCBA configuration and work cycle (length and rest), 30 firefighters completed seven trials using different SCBA and one or two bouts of simulated firefighting following work cycles common in the United States. Heart rate, core temperature, oxygen consumption, work output and self-reported perceptions were recorded during all activities. Varying SCBA resulted in few differences in these parameters. However, during a second bout, work output significantly declined while heart rates and core temperatures were elevated relative to a single bout. Thirty seven per cent of the subjects were unable to complete the second bout in at least one of the two-bout conditions. These firefighters had lower fitness and higher body mass than those who completed all assigned tasks.Practitioner Summary: The effects of extended duration SCBA and work/rest cycles on physiological parameters and work output have not been examined. Cylinder size had minimal effects, but extended work cycles with no rest resulted in increased physiological strain and decreased work output. This effect was more pronounced in firefighters with lower fitness.
机译:消防员的自给式呼吸器(SCBA)在消防过程中保护呼吸系统,但会增加生理负担。较长的SCBA持续时间(> 30分钟)增加了空气供应,可能会增加消防工作周期的持续时间。为了检查SCBA配置和工作周期(长度和休息时间)的影响,在美国常见的工作周期后,有30名消防员使用不同的SCBA进行了7次试验,并进行了一到两次模拟灭火。在所有活动中均记录了心率,核心温度,耗氧量,工作量和自我报告的看法。 SCBA的不同导致这些参数的差异很小。但是,在第二次回合中,相对于单回合,工作量显着下降,而心率和核心温度却升高。三分之二的受试者中至少有37%无法完成第二回合。这些消防员的身体素质和体重均比完成所有分配任务的消防员低。从业人员摘要:尚未检查长时间SCBA和工作/休息周期对生理参数和工作输出的影响。气缸尺寸的影响很小,但是延长的工作周期而没有休息会导致生理压力增加和工作输出减少。在身体素质较低的消防员中,这种影响更为明显。

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