Enhanced cardiac vagal tone in mental fatigue: Analysis of heart rate variability in Time-on-Task, recovery, and reactivity.

Note, however, that we did find a highly significant improvement in performance after the break (block 5 vs. post-break block: F(1,19) = 10.74, p < .01, η p 2 = .36), suggesting that performance before the break may nevertheless have been suboptimal.

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