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Open AccessArticle

Oral Glutamine Supplement Reduces Subjective Fatigue Ratings during Repeated Bouts of Firefighting Simulations

1
School of Health Sciences, Health Professions Building 2219, Central Michigan University, Mt. Pleasant, MI 48859, USA
2
Department of Health, Exercise, and Sport Science, Johnson Center B143 MSC04 2610, University of New Mexico, Albuquerque, NM 87131-0001, USA
3
Department of Kinesiology, University of Northern Iowa, Cedar Falls, IA 50614, USA
4
School of Rehabilitation and Medical Sciences, Health Professions Building 1208, Central Michigan University, Mt. Pleasant, MI 48859, USA
*
Author to whom correspondence should be addressed.
Safety 2019, 5(2), 38; https://doi.org/10.3390/safety5020038
Received: 3 May 2019 / Revised: 6 June 2019 / Accepted: 10 June 2019 / Published: 14 June 2019
Wildland firefighting requires repetitive (e.g., consecutive work shifts) physical work in dangerous conditions (e.g., heat and pollution). Workers commonly enter these environments in a nonacclimated state, leading to fatigue and heightened injury risk. Strategies to improve tolerance to these stressors are lacking. Purpose: To determine if glutamine ingestion prior to and after consecutive days of firefighting simulations in the heat attenuates subjective ratings of fatigue, and evaluate if results were supported by glutamine-induced upregulation of biological stress responses. Methods: Participants (5 male, 3 female) ingested glutamine (0.15 g/kg/day) or a placebo before and after two consecutive days (separated by 24 h) of firefighter simulations in a heated chamber (35 °C, 35% humidity). Perceived fatigue and biological stress were measured pre-, post-, and 4 h postexercise in each trial. Results: Subjective fatigue was reduced pre-exercise on Day 2 in the glutamine group (p < 0.05). Peripheral mononuclear cell expression of heat shock protein 70 (HSP70) and serum antioxidants were elevated at 4 h postexercise on Day 1 in the glutamine trial (p < 0.05). Conclusions: Ingestion of glutamine before and after repeated firefighter simulations in the heat resulted in reduced subjective fatigue on Day 2, which may be a result of the upregulation of biological stress systems (antioxidants, HSPs). This response may support recovery and improve work performance. View Full-Text
Keywords: fatigue; glutamine; heat; firefighter; recovery; heat shock proteins fatigue; glutamine; heat; firefighter; recovery; heat shock proteins
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Moore, M.; Moriarty, T.A.; Connolly, G.; Mermier, C.; Amorim, F.; Miller, K.; Zuhl, M. Oral Glutamine Supplement Reduces Subjective Fatigue Ratings during Repeated Bouts of Firefighting Simulations. Safety 2019, 5, 38.

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