Racing an Opponent: Alteration of Pacing, Performance, and Muscle-Force Decline but Not Rating of Perceived Exertion

Int J Sports Physiol Perform. 2018 Mar 1;13(3):283-289. doi: 10.1123/ijspp.2017-0220. Epub 2018 Mar 1.


Purpose: Performing against a virtual opponent has been shown to invite a change in pacing and improve time-trial (TT) performance. This study explored how this performance improvement is established by assessing changes in pacing, neuromuscular function, and perceived exertion.

Methods: After a peak-power-output test and a familiarization TT, 12 trained cyclists completed two 4-km TTs in randomized order on a Velotron cycle ergometer. TT conditions were riding alone (NO) and riding against a virtual opponent (OP). Knee-extensor performance was quantified before and directly after the TT using maximal voluntary contraction force (MVC), voluntary activation (VA), and potentiated doublet-twitch force (PT). Differences between the experimental conditions were examined using repeated-measures ANOVAs. Linear-regression analyses were conducted to associate changes in pacing to changes in MVC, VA, and PT.

Results: OP was completed faster than NO (mean power output OP 289.6 ± 56.1 vs NO 272.2 ± 61.6 W; P = .020), mainly due to a faster initial pace. This was accompanied by a greater decline in MVC (MVC pre vs post -17.5% ± 12.4% vs -11.4% ± 10.9%, P = .032) and PT (PT pre vs post -23.1% ± 14.0% vs -16.2% ±11.4%, P = .041) after OP than after NO. No difference between conditions was found for VA (VA pre vs post -4.9% ± 6.7% vs -3.4% ± 5.0%, P = .274). Rating of perceived exertion did not differ between OP and NO.

Conclusion: The improved performance when racing against a virtual opponent was associated with a greater decline in voluntary and evoked muscle force than riding alone, without a change in perceived exertion, highlighting the importance of human-environment interactions in addition to one's internal state for pacing regulation and performance.

Keywords: competition; cycling; muscle fatigue; pacing strategy; perception.

MeSH terms

  • Adult
  • Athletic Performance / physiology*
  • Athletic Performance / psychology
  • Bicycling / physiology*
  • Bicycling / psychology
  • Competitive Behavior
  • Ergometry
  • Heart Rate
  • Humans
  • Male
  • Middle Aged
  • Muscle Fatigue*
  • Muscle, Skeletal / physiology*
  • Physical Exertion*