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Pre-shift fluid intake: effect on physiology, work and drinking during emergency wildfire fighting.

Abstract

Wildfire fighters are known to report to work in a hypohydrated state, which may compromise their work performance and health.

PURPOSE

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.

METHODS

Thirty-two firefighters were divided into non-bolus (AD) and pre-shift drinking bolus (PS, 500 ml water) groups.

RESULTS

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.

CONCLUSION

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.

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  • Authors+Show Affiliations

    ,

    School of Exercise and Nutrition Sciences, Deakin University, Burwood 3125, Australia.

    , , , ,

    Source

    Applied ergonomics 43:3 2012 May pg 532-40

    MeSH

    Adult
    Body Temperature
    Body Temperature Regulation
    Dehydration
    Drinking
    Emergencies
    Female
    Firefighters
    Fluid Therapy
    Heart Rate
    Humans
    Male
    Middle Aged
    Motor Activity
    Occupational Health
    Osmolar Concentration
    Plasma
    Specific Gravity
    Urine

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    21906723

    Citation

    Raines, Jenni, et al. "Pre-shift Fluid Intake: Effect On Physiology, Work and Drinking During Emergency Wildfire Fighting." Applied Ergonomics, vol. 43, no. 3, 2012, pp. 532-40.
    Raines J, Snow R, Petersen A, et al. Pre-shift fluid intake: effect on physiology, work and drinking during emergency wildfire fighting. Appl Ergon. 2012;43(3):532-40.
    Raines, J., Snow, R., Petersen, A., Harvey, J., Nichols, D., & Aisbett, B. (2012). Pre-shift fluid intake: effect on physiology, work and drinking during emergency wildfire fighting. Applied Ergonomics, 43(3), pp. 532-40. doi:10.1016/j.apergo.2011.08.007.
    Raines J, et al. Pre-shift Fluid Intake: Effect On Physiology, Work and Drinking During Emergency Wildfire Fighting. Appl Ergon. 2012;43(3):532-40. PubMed PMID: 21906723.
    * Article titles in AMA citation format should be in sentence-case
    TY - JOUR T1 - Pre-shift fluid intake: effect on physiology, work and drinking during emergency wildfire fighting. AU - Raines,Jenni, AU - Snow,Rodney, AU - Petersen,Aaron, AU - Harvey,Jack, AU - Nichols,David, AU - Aisbett,Brad, Y1 - 2011/09/09/ PY - 2011/03/14/received PY - 2011/08/12/accepted PY - 2011/9/13/entrez PY - 2011/9/13/pubmed PY - 2012/5/11/medline SP - 532 EP - 40 JF - Applied ergonomics JO - Appl Ergon VL - 43 IS - 3 N2 - UNLABELLED: Wildfire fighters are known to report to work in a hypohydrated state, which may compromise their work performance and health. PURPOSE: 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. METHODS: Thirty-two firefighters were divided into non-bolus (AD) and pre-shift drinking bolus (PS, 500 ml water) groups. RESULTS: 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. CONCLUSION: 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. SN - 1872-9126 UR - https://www.unboundmedicine.com/medline/citation/21906723/Pre_shift_fluid_intake:_effect_on_physiology_work_and_drinking_during_emergency_wildfire_fighting_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-6870(11)00124-4 DB - PRIME DP - Unbound Medicine ER -