New Instrument to Measure Ad Libitum Fluid Intake in the Field

DeGroot, David W.; Kesick, Christina M.; Stulz, Dean A.; Hoyt, Reed W.; Lanza, Joao Felipe Rodrigues; Montain, Scott J.

doi:10.1097/00005768-200105001-01446

Cited by 3 publications

(2 citation statements)

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“…The system was equipped with a digital flow-meter system affixed inline to allow for the measurement of drinking characteristics (drinking frequency and drinking volume). 7 Activity data were collected using the Actical actigraphy units (Mini Mitter, A Respironics Company, Bend, OR) via methods previously described. 5…”

Section: Physiological Monitorsmentioning

confidence: 99%

High Work Output Combined With High Ambient Temperatures Caused Heat Exhaustion in a Wildland Firefighter Despite High Fluid Intake

Cuddy

Ruby

2011

Wilderness & Environmental Medicine

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The purpose of this case study is to examine the physiological/behavioral factors leading up to heat exhaustion in a male wildland firefighter during wildland fire suppression. The participant (24 years old, 173 cm, 70 kg, and 3 years firefighting experience) experienced heat exhaustion following 7 hours of high ambient temperatures and arduous work on the fire line during the month of August. At the time of the heat-related incident (HRI), core temperature was 40.1 °C (104.2 °F) and skin temperature was 34.4 °C (93.9 °F). His work output averaged 1067 counts·min(-1) (arbitrary units for measuring activity) for the 7 hours prior to the HRI, a very high rate of work over an extended time period during wildfire suppression. In the 2.5 hours leading up to the heat incident, he was exposed to a mean ambient temperature of 44.6 °C (112.3 °F), with a maximum temperature of 59.7 °C (139.5 °F). He consumed an average of 840 mL·h(-1) in the 7 hours leading up to the incident and took an average of 24 ± 11 drinks·h(-1) (total of 170 drinks). The combined effects of a high work rate and high ambient temperatures resulted in an elevated core temperature and a higher volume and frequency of drinking than typically seen in this population, ultimately ending in heat exhaustion and removal from the fire line. The data demonstrate that heat-related incidents can occur even with aggressive fluid intake during wildland fire suppression.

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Section: Physiological Monitorsmentioning

confidence: 99%

High Work Output Combined With High Ambient Temperatures Caused Heat Exhaustion in a Wildland Firefighter Despite High Fluid Intake

Cuddy

Ruby

2011

Wilderness & Environmental Medicine

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“…This system has been validated for accuracy and reliability. 25 Activity data were collected using the ActiCal actigraphy units (Mini Mitter) via methods previously described. 1 Briefly, activity monitors were initialized to collect data at the beginning of the shift, placed on a white foam square (ϳ7.6 cm ϫ 7.6 cm), and inserted in the left shirt pocket of participants.…”

Section: Experimental Designmentioning

confidence: 99%

Effects of an Electrolyte Additive on Hydration and Drinking Behavior During Wildfire Suppression

Cuddy

Ham

Harger

et al. 2008

Wilderness & Environmental Medicine

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Reliability and Validity of a Prototype Fluid Intake Monitor

Tharion¹,

Karis²,

Hoyt³

2009

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Standard Form 298 (Rev. 8/98) REPORT DOCUMENTATION PAGEPrescribed by ANSI Std. Z39.18 Form Approved OMB No. 0704-0188The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, The Fluid Intake Monitor (FIM) measures fluid consumed from a bladder hydration system. Bench and field tests were performed to assess reliability and validity of the FIM, Fluid volumes of FIM were compared to scale-weighed volumes of water. Bench Test Results: an absolute percent error existed (p < 0.001) between sips, with the FIM significantly overestimating the first sip (p < 0.01) compared to the subsequent nine sips. A significant intraclass reliability coefficient (ICC) = 0.83 was achieved for trials 2 through 10. There was no difference in mean sip volume measured using the FIM vs. the scale (25.7 + 10.7 ml vs. 25.6 + 8.7 ml, respectively). Field Test Results: of 31 trials, 4 trials under-measured water consumption in excess of 15% (29.4% to 47.1%), and two trials over-measured water consumption in excess of 15% (15.5% and 16.6%). These units were neither reliable nor valid for use in the field. Software and hardware modifications identified should significantly improve FIM performance.

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New Instrument to Measure Ad Libitum Fluid Intake in the Field

Cited by 3 publications

References 0 publications

High Work Output Combined With High Ambient Temperatures Caused Heat Exhaustion in a Wildland Firefighter Despite High Fluid Intake

High Work Output Combined With High Ambient Temperatures Caused Heat Exhaustion in a Wildland Firefighter Despite High Fluid Intake

Effects of an Electrolyte Additive on Hydration and Drinking Behavior During Wildfire Suppression

Reliability and Validity of a Prototype Fluid Intake Monitor

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