Key result
Cognitive load during moderate exercise significantly impairs executive function compared to exercise alone.
Why the study?
The impact of prolonged cognitive load on executive function and reaction time during exercise was unclear.
RCT (n=20)
Randomized, counterbalanced order
No
Answers are grounded in this paper and cite their sources.
May warrant caution combining cognitive tasks with aerobic exercise; hypothesis-generating and requires randomized confirmation before practice change.
The speed and accuracy of decision-making (i.e., executive function (EF) domains) is an integral factor in many sports. At rest, prolonged cognitive load (pCL) impairs reaction time (RT). In contrast, exercise improves RT and EF. We hypothesized that RT and EF during exercise would be diminished by prolonged ‘dual tasking’ as a consequence of pCL. To test the hypothesis, twenty healthy male participants performed four conditions [resting control (Rest), pCL only (pCLRest), exercise only (EX), and pCL + exercise (pCLEX)] in a randomized-crossover design. Both exercise conditions utilized a 50-min cycling exercise protocol (60% VO2 peak) and the pCL was achieved via a 50-min colour-word Stroop task (CWST). Compared with Rest, pCLRest caused a slowed CWST RT (P < 0.05) and a large SD (i.e., intraindividual variability) of CWST RT (P < 0.01). Similarly, compared with EX, the slowed CWST RT (P < 0.05) and large SD of CWST RT (P < 0.01) were also observed in pCLEX. Whereas the reverse-Stroop interference was not affected in pCLRest (P = 0.46), it was larger (i.e., declined EF) in pCLEX than EX condition (P < 0.05). These observations provide evidence that the effort of pCL impairs RT and EF even during exercise.
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Tsukamoto et al. (2022) conducted an RCT in Healthy (n=20). Prolonged cognitive load (pCL) via colour-word Stroop task vs. Exercise only (EX) was evaluated on Reverse-Stroop interference score (executive function) (r = 0.53, p=< 0.05). Prolonged cognitive load during moderate-intensity aerobic exercise significantly diminished executive function (increased reverse-Stroop interference score) compared to exercise alone.
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