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2017 ; 8
(ä): 680
Nephropedia Template TP
Head J
; Tenan MS
; Tweedell AJ
; LaFiandra ME
; Morelli F
; Wilson KM
; Ortega SV
; Helton WS
Front Physiol
2017[]; 8
(ä): 680
PMID28951724
show ga
Purpose: Mental fatigue has been shown to impair subsequent physical performance
in continuous and discontinuous exercise. However, its influence on subsequent
fine-motor performance in an applied setting (e.g., marksmanship for trained
soldiers) is relatively unknown. The purpose of this study was to investigate
whether prior mental fatigue influences subsequent marksmanship performance as
measured by shooting accuracy and judgment of soldiers in a live-fire scenario.
Methods: Twenty trained infantry soldiers engaged targets after completing either
a mental fatigue or control intervention in a repeated measure design. Heart rate
variability and the NASA-TLX were used to gauge physiological and subjective
effects of the interventions. Target hit proportion, projectile group accuracy,
and precision were used to measure marksmanship accuracy. Marksmanship accuracy
was assessed by measuring bullet group accuracy (i.e., how close a group of shots
are relative to center of mass) and bullet group precision (i.e., how close are
each individual shot to each other). Additionally, marksmanship decision accuracy
(correctly shooting vs. correctly withholding shot) when engaging targets was
used to examine marksmanship performance. Results: Soldiers rated the mentally
fatiguing task (59.88 ± 23.7) as having greater mental workload relative to the
control intervention [31.29 ± 12.3, t((19)) = 1.72, p < 0.001]. Additionally,
soldiers completing the mental fatigue intervention (96.04 ± = 37.1) also had
lower time-domain (standard deviation of normal to normal R-R intervals) heart
rate variability relative to the control [134.39 ± 47.4, t((18)) = 3.59, p <
0.001]. Projectile group accuracy and group precision failed to show differences
between interventions [t((19)) = 0.98, p = 0.34, t((19)) = 0.18, p = 0.87,
respectively]. Marksmanship decision errors significantly increased after
soldiers completed the mental fatigue intervention (48% ± 22.4) relative to the
control intervention [M = 32% ± 79.9, t((19)) = 4.39, p < 0.001]. There was a
significant negative correlation between shooting response time and errors of
commission (r = -0.61; p = 0.004) when preceded by the mental fatigue
intervention, but not the control (r = -0.31; p = 0.17). Conclusion: The mental
fatigue intervention was successful in eliciting fatigue which was supported
subjectively and objectively. Marksmanship judgment performance is significantly
reduced when soldiers are mentally fatigued, although shot accuracy is not.
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