Applicability of the Reflection Index of Respiration Based on Heart Rate Variability Analysis to Firefighting Activity

Yushi Ito, Y. Oka, Y. Kuriyama
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引用次数: 2

Abstract

Firefighting is one of the most physically demanding and hazardous occupations in any country. When the firefighting activity continues for extended periods of time, firefighters are at risk for a decline in their physical and mental work ability. To ensure their safety, it is important for firefighters to be knowledgeable regarding their own physical condition. We have introduced an index of cardiorespiratory load that reflects respiratory metabolism state, the reflection index of respiration ( RIR ). This index is derived based on data, obtained under designed load activities, performed in a shuttle run test and bicycle ergometer test. Therefore, the applicability and effectiveness of this index to activities involving severe physical activities at a firefighting site, have not yet been evaluated. The RIR was applied in a simulated firefighting activity test, conducted according to a standardized protocol. This standardized firefighting test protocol consisted of 13 activities and required continuous physical activity for 26 min. The following results were obtained. First, RIR showed a good response to load intensity even when the activity loads varied irregularly in time. Second, the variation of the RIR demonstrated a good correlation, both, with the respiratory metabolic state and the blood lactate levels. Third, the RIR presented high sensitivity in response to firefighters’ changes in body movements and respiration, during the simulated firefighting activity test. The proposed index, providing objective information that supplements a firefighter’s subjective assessment of his or her own physical state, could be applied in the prevention of overexertion and is expected to improve the occupational safety of firefighters.
基于心率变异性分析的呼吸反射指数在消防活动中的适用性
在任何国家,消防都是对体力要求最高、最危险的职业之一。当消防活动持续较长时间时,消防员的身体和精神工作能力都有下降的危险。为了确保他们的安全,消防员了解自己的身体状况是很重要的。我们引入了反映呼吸代谢状态的心肺负荷指标——呼吸反射指数(RIR)。该指标是根据在设计载荷活动下获得的数据,在穿梭试验和自行车测力仪试验中进行的。因此,该指标对消防现场剧烈体力活动的适用性和有效性尚未得到评价。RIR应用于模拟消防活动测试,根据标准化协议进行。这个标准化的消防测试方案包括13项活动,需要持续26分钟的体力活动。得到以下结果:首先,即使活动负荷随时间的变化不规律,RIR对负荷强度也表现出良好的响应。其次,RIR的变化与呼吸代谢状态和血乳酸水平均表现出良好的相关性。第三,在模拟消防活动测试中,RIR对消防员身体动作和呼吸变化的反应具有较高的敏感性。提出的指标提供了客观信息,补充了消防员对自己身体状况的主观评估,可用于预防过度劳累,并有望提高消防员的职业安全。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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