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Work-Related Fatigue: Relationship Between Perceived and Performance Fatigability in Career Firefighters
Amber N Schmitz1, Hayden K Giuliani-Dewig, Megan R Laffan
1From the MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (A.N.S., G.R.G., N.A.B., E.D.R.); Carolina Center for Healthy Work Design and Worker Well-Being, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (A.N.S., G.R.G., N.A.B., E.D.R.); Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (A.N.S., N.A.B., E.D.R.); Neuro Performance Innovation Center, Rockefeller Neuroscience Institute, West Virginia University, Morgantown, West Virginia (H.K.G.-D.); Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (M.R.L.); United States Performance Center, Charlotte, North Carolina (A.J.T.); and Neuromuscular and Occupational Performance Laboratory, Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, Texas (J.A.M.).
Objective:
The purpose of this study was to (1) examine the relationship between perceived work-related fatigue and performance fatigability, and (2) assess the impact of percent body fat (%BF) on perceived fatigue constructs in career firefighters.
Methods:
Thirty-nine career firefighters completed body composition testing, the Occupational Fatigue Exhaustion Recovery (OFER15) scale assessing three subscales of work-related fatigue (acute fatigue, chronic fatigue, and inter-shift recovery), and maximal leg extensor isometric strength testing prior to and following an isotonic fatiguing protocol.
Results:
Performance fatigability was not associated with any of the OFER15 perceived work-related fatigue variables ( P ≥ 0.513). Greater %BF was associated with greater %∆ peak torque ( r = -0.41, P = 0.010) but none of the OFER15 perceived work-related fatigue variables ( P ≥ 0.638).
Conclusions:
Performance fatigability was not associated with OFER15 perceived work-related fatigue, and greater adiposity negatively impacted performance fatigability but not perceived fatigability.
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