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The Effects of Load Carriage and Physical Fatigue on Cognitive Performance.

Eddy MD, Hasselquist L, Giles G, Hayes JF, Howe J, Rourke J, Coyne M, O'Donovan M, Batty J, Brunyé TT, Mahoney CR - PLoS ONE (2015)

Bottom Line: In the current study, ten participants walked for two hours while carrying no load or a 40 kg load.There were also shifts in response criterion towards responding yes and decreased sensitivity in responding in the loaded condition compared to the unloaded condition.In the visual target detection there were no reliable effects of load carriage in the overall analysis however, there were slower reaction times in the loaded compared to unloaded condition during the second hour.

View Article: PubMed Central - PubMed

Affiliation: U.S. Army Natick Soldier Research, Development, and Engineering Center, Natick, Massachusetts, United States of America; Department of Psychology, Tufts University, Medford, Massachusetts, United States of America.

ABSTRACT
In the current study, ten participants walked for two hours while carrying no load or a 40 kg load. During the second hour, treadmill grade was manipulated between a constant downhill or changing between flat, uphill, and downhill grades. Throughout the prolonged walk, participants performed two cognitive tasks, an auditory go no/go task and a visual target detection task. The main findings were that the number of false alarms increased over time in the loaded condition relative to the unloaded condition on the go no/go auditory task. There were also shifts in response criterion towards responding yes and decreased sensitivity in responding in the loaded condition compared to the unloaded condition. In the visual target detection there were no reliable effects of load carriage in the overall analysis however, there were slower reaction times in the loaded compared to unloaded condition during the second hour.

No MeSH data available.


Related in: MedlinePlus

Means and standard errors of percentage of VO2Peak by time, for each of the two load (loaded and unloaded) and grade (downhill, variable) conditions.UD: unloaded, downhill; UV: unloaded, variable; LD: loaded, downhill; LV: loaded, variable.
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pone.0130817.g002: Means and standard errors of percentage of VO2Peak by time, for each of the two load (loaded and unloaded) and grade (downhill, variable) conditions.UD: unloaded, downhill; UV: unloaded, variable; LD: loaded, downhill; LV: loaded, variable.

Mentions: During the second hour, when grade was manipulated, participants in the loaded condition had a higher percentage of VO2Peak than in the unloaded condition, F(1,9) = 57.4, p < .001, ƞp2 = .86. There was also an interaction between load, grade, and time, F(4,36) = 6.64, p < .001, ƞp2 = .43. Follow-up comparisons examining the loaded and unloaded conditions separately revealed lower percentages of VO2Peak in the downhill condition compared to the variable condition for both load conditions, loaded: F(1,9) = 20.76, p = .001, ƞp2 = .7; unloaded: F(1,9) = 60.61, p < .001, ƞp2 = .88. In addition, for both load conditions, grade also interacted with time reflecting higher percentage of VO2Peak in the variable condition when walking on a flat or uphill incline (p’s < .001), but not differing when walking downhill (p’s > .17), see Fig 2.


The Effects of Load Carriage and Physical Fatigue on Cognitive Performance.

Eddy MD, Hasselquist L, Giles G, Hayes JF, Howe J, Rourke J, Coyne M, O'Donovan M, Batty J, Brunyé TT, Mahoney CR - PLoS ONE (2015)

Means and standard errors of percentage of VO2Peak by time, for each of the two load (loaded and unloaded) and grade (downhill, variable) conditions.UD: unloaded, downhill; UV: unloaded, variable; LD: loaded, downhill; LV: loaded, variable.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496096&req=5

pone.0130817.g002: Means and standard errors of percentage of VO2Peak by time, for each of the two load (loaded and unloaded) and grade (downhill, variable) conditions.UD: unloaded, downhill; UV: unloaded, variable; LD: loaded, downhill; LV: loaded, variable.
Mentions: During the second hour, when grade was manipulated, participants in the loaded condition had a higher percentage of VO2Peak than in the unloaded condition, F(1,9) = 57.4, p < .001, ƞp2 = .86. There was also an interaction between load, grade, and time, F(4,36) = 6.64, p < .001, ƞp2 = .43. Follow-up comparisons examining the loaded and unloaded conditions separately revealed lower percentages of VO2Peak in the downhill condition compared to the variable condition for both load conditions, loaded: F(1,9) = 20.76, p = .001, ƞp2 = .7; unloaded: F(1,9) = 60.61, p < .001, ƞp2 = .88. In addition, for both load conditions, grade also interacted with time reflecting higher percentage of VO2Peak in the variable condition when walking on a flat or uphill incline (p’s < .001), but not differing when walking downhill (p’s > .17), see Fig 2.

Bottom Line: In the current study, ten participants walked for two hours while carrying no load or a 40 kg load.There were also shifts in response criterion towards responding yes and decreased sensitivity in responding in the loaded condition compared to the unloaded condition.In the visual target detection there were no reliable effects of load carriage in the overall analysis however, there were slower reaction times in the loaded compared to unloaded condition during the second hour.

View Article: PubMed Central - PubMed

Affiliation: U.S. Army Natick Soldier Research, Development, and Engineering Center, Natick, Massachusetts, United States of America; Department of Psychology, Tufts University, Medford, Massachusetts, United States of America.

ABSTRACT
In the current study, ten participants walked for two hours while carrying no load or a 40 kg load. During the second hour, treadmill grade was manipulated between a constant downhill or changing between flat, uphill, and downhill grades. Throughout the prolonged walk, participants performed two cognitive tasks, an auditory go no/go task and a visual target detection task. The main findings were that the number of false alarms increased over time in the loaded condition relative to the unloaded condition on the go no/go auditory task. There were also shifts in response criterion towards responding yes and decreased sensitivity in responding in the loaded condition compared to the unloaded condition. In the visual target detection there were no reliable effects of load carriage in the overall analysis however, there were slower reaction times in the loaded compared to unloaded condition during the second hour.

No MeSH data available.


Related in: MedlinePlus