Effects of self-selected audiovisual stimuli on affective responses and cortical oxygenation in the prefrontal cortex during acute endurance exercise: An fNIRS study
Résumé
Objectives: Using audiovisual stimuli during exercise is an effective strategy to enhance pleasure, which is crucial for sustaining exercise. According to self-determination theory, self-selected audiovisual stimuli may boost autonomy and intrinsic motivation. However, the effects of self-selected audiovisual stimuli remain inconclusive. Thus, this study examines the impact of self-selected audiovisual stimuli on affective responses and prefrontal oxygenation during acute endurance exercise.
Methods: Twenty-nine physically inactive individuals (Mage = 19.6, SD = 1.4 years, 3 males) participated in the intervention with three conditions: self-selected (SS), researcher-selected (RS), and no audiovisual stimuli (control, C). Conditions were randomized and counterbalanced. Participants exercised for 23 min (3 min warm-up + 20 min moderate-intensity treadmill running). Functional near-infrared spectroscopy assessed cortical oxygenation changes in the dorsolateral prefrontal cortex (dlPFC). Psychological responses (affective valence, arousal, perceived exertion, and attentional focus) were measured before and during exercise. Linear mixed models were used to compare condition differences.
Results: Participants reported more positive affective valence (p = .02, ηp2 = 0.02) and more external attentional focus (p < .01, ηp2 = 0.16) in the SS compared to the RS condition. Oxygenated hemoglobin (O2Hb) in the right dlPFC was also higher in the SS (p < .01, ηp2 = 0.05) compared to the RS condition. However, correlations between affective valence and O2Hb were not significant (right dlPFC: r = 0.21, p = .12; left dlPFC: r = −0.17, p = .19).
Conclusions: Self-selected audiovisual stimuli appear to induce positive affective valence and increase O2Hb in the right dlPFC. These stimuli may activate the right prefrontal cortex to regulate negative affective valence. Future research should explore factors that moderate or mediate these effects, providing further insight into the neurophysiological processes that enhance exercise-related positive affective valence.
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