Effects of Visual Feedback Availability on Aerobic Performance and Pacing Strategy During a 5 km Running Time Trial.

Running is a widely practiced exercise modality in which central and peripheral fatigue can influence performance and pacing strategy. This study investigated the influence of cognitive-emotional factors, based on the psychobiological model of fatigue, on 5 km time trial performance using a randomized crossover design. Twenty-two recreational male runners (23.0 ± 3.05 years) completed four laboratory visits. During the first visit, participants underwent body composition assessment and an incremental test to determine maximal oxygen uptake (VO2max) and the velocity associated with VO2max. In the subsequent three visits, participants performed a 5 km treadmill time trial as fast as possible under three conditions: no feedback (5k-NF), distance-only feedback (5k-Dist), and full feedback (5k-FF). No significant differences in performance were observed between conditions (5k-FF: 24.3 ± 1.8 min; 5k-NF: 24.8 ± 2.1 min; 5k-Dist: 24.7 ± 2.7 min). Regardless of the condition, ratings of perceived exertion and heart rate increased progressively throughout the trials. Other physiological variables showed similar responses across conditions. These findings indicate that manipulating feedback availability during a 5 km time trial did not significantly alter performance or physiological responses under the specific laboratory conditions examined, despite that the true absolute absence of effect should be interpreted with appropriate caution.