Mental Fatigue From Smartphone Use or Stroop Task Does Not Affect Bench Press Force–Velocity Profile, One-Repetition Maximum, or Vertical Jump Performance
Alix-Fages C, Baz-Valle E, González-Cano H, Jiménez-Martínez P, Balsalobre-Fernández C
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Summary
In a randomized, double-blind cross-over trial of 25 resistance-trained adults, both 30 minutes of smartphone social media use and a Stroop task significantly increased perceived mental fatigue relative to a control condition (social media: p = .007; Stroop: p < .001). However, neither condition affected the bench press force–velocity profile, one-repetition maximum, or countermovement jump performance, with effect sizes negligible to small (≤0.24). The findings suggest mental fatigue can be induced subjectively without translating into reduced maximal strength or power output in a single testing session.
Key findings
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Both 30 minutes of smartphone social media use and a Stroop task significantly increased perceived mental fatigue versus control
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Neither condition significantly affected the bench press force–velocity profile, one-repetition maximum, or countermovement jump (CMJ) performance
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Effect sizes across all measures were negligible to small (≤0.24)
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Participants were 25 resistance-trained adults; the results suggest maximal strength/power measures in a single session may be resistant to mental fatigue effects
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