title: Cognitive Fatigue Influences Time-On-Task during Bodyweight Resistance Training Exercise.
abstract: Prior investigations have shown measurable performance impairments on continuous physical performance tasks when preceded by a cognitively fatiguing task. However, the effect of cognitive fatigue on bodyweight resistance training exercise task performance is unknown. In the current investigation 18 amateur athletes completed a full body exercise task preceded by either a cognitive fatiguing or control intervention. In a randomized repeated measure design, each participant completed the same exercise task preceded by a 52 min cognitively fatiguing intervention (vigilance) or control intervention (video). Data collection sessions were separated by 1 week. Participants rated the fatigue intervention with a significantly higher workload compared to the control intervention (p < 0.001). Additionally, participants self-reported significantly greater energetic arousal for cognitively fatiguing task (p = 0.02). Cognitive fatigue did not significantly impact number of repetitions completed during the exercise task (p = 0.77); however, when cognitively fatigued, participants had decreased percent time-on-task (57%) relative to the no fatigue condition (60%; p = 0.04). RPE significantly changed over time (p < 0.001), but failed to show significant differences between the cognitive fatigue intervention and control intervention (p > 0.05). There was no statistical difference for heart rate or metabolic expenditure as a function of fatigue intervention during exercise. Cognitively fatigued athletes have decreased time-on-task in bodyweight resistance training exercise tasks.
authors.affiliation: U.S. Army Research Laboratory, Human Research and Engineering Directorate Aberdeen Proving Ground, MD, USA.
authors.forename: James R
authors.initials: JR
authors.lastname: Head
authors.affiliation: U.S. Army Research Laboratory, Human Research and Engineering Directorate Aberdeen Proving Ground, MD, USA.
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Tenan
authors.affiliation: U.S. Army Research Laboratory, Human Research and Engineering Directorate Aberdeen Proving Ground, MD, USA.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Tweedell
authors.affiliation: U.S. Army Research Laboratory, Human Research and Engineering Directorate Aberdeen Proving Ground, MD, USA.
authors.forename: Thomas F
authors.initials: TF
authors.lastname: Price
authors.affiliation: U.S. Army Research Laboratory, Human Research and Engineering Directorate Aberdeen Proving Ground, MD, USA.
authors.forename: Michael E
authors.initials: ME
authors.lastname: LaFiandra
authors.affiliation: Psychology Department, George Mason University Fairfax, VA, USA.
authors.forename: William S
authors.initials: WS
authors.lastname: Helton
keywords: bodyweight resistance training exercise; cognitive fatigue; mental workload