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. 2018 Apr;50(4):809-816.
doi: 10.1249/MSS.0000000000001483.

Deception Improves Time Trial Performance in Well-trained Cyclists without Augmented Fatigue

Paul Ansdell  1 , Kevin Thomas  1 , Glyn Howatson  1   1 , Markus Amann  1 , Stuart Goodall  1
Affiliations

Deception Improves Time Trial Performance in Well-trained Cyclists without Augmented Fatigue

Paul Ansdell et al. Med Sci Sports Exerc. 2018 Apr.

Abstract

Purpose: To investigate the effects of feedback, in the form of a virtual avatar paced at 100% and 102% of baseline performance, on neuromuscular fatigue after a 4-km cycling time trial (TT). We hypothesized that improved cycling performance would occur because of the participants exceeding a previously established critical threshold and experiencing greater neuromuscular fatigue.

Methods: After familiarization, 10 well-trained cyclists performed a baseline 4-km TT without feedback (BASE), followed by two 4-km TT where they raced against an avatar (set at 100% accurate [ACC] and 102% deception [DEC] of baseline power output) in a randomized and counterbalanced order. Before and after each TT, neuromuscular fatigue was assessed using maximal isometric voluntary contractions (MVC) of the quadriceps, and supramaximal electrical stimulation of the femoral nerve, during and 2 s after MVCs to assess voluntary activation and potentiated twitch force. Blood lactate was taken pretrials and posttrials and RPE was taken throughout each TT.

Results: Time trial performance improved after deception of feedback compared with baseline performance (-5.8 s, P = 0.019). Blood lactate increased after DEC compared with BASE (+1.37 mmol·L, P = 0.019). Despite this, there was no difference in any measures of exercise-induced neuromuscular fatigue (P > 0.05). Similarly, RPE was not different between trials.

Conclusions: Well-trained male cyclists can improve cycling TT performance when competing against an avatar increased to 102% of a previously established best effort. However, this improvement is not associated with a measurable augmentation of neuromuscular fatigue.

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Conflict of interest statement

Conflicts of Interest

The authors report no personal, financial or other conflicts of interest are declared by the authors. The results of the present study do not constitute endorsement by the American College of Sports Medicine.

Figures

Figure 1
Figure 1
Power output during the 4 km time-trials displayed over 10% epochs. # = P < 0.05 significant interaction effect, * P < 0.05 deception significantly different from baseline.
Figure 2
Figure 2
Changes in neuromuscular function from pre to post each time-trial. MVC, maximal voluntary contraction (A); VA, voluntary activation (B) and Qtw,pot, quadriceps potentiated twitch force (C). For each variable, individual data are shown as the unfilled symbols and the group mean is shown as the filled symbols.
See this image and copyright information in PMC

References

    1. Abbiss CR, Laursen PB. Describing and Understanding Pacing Strategies during Athletic Competition. Sports Med. 2008;38(3):239–52. - PubMed
    1. Foster C, Schrager M, Snyder AC, Thompson NN. Pacing strategy and athletic performance. Sports Med. 1994;17(2):77–85. - PubMed
    1. Coyle EF, Coggan AR, Hemmert MK, Ivy JL. Muscle glycogen utilization during prolonged strenuous exercise when fed carbohydrate. J Appl Physiol. 1986;61(1):165–72. - PubMed
    1. Amann M, Pegelow DF, Jacques AJ, Dempsey JA. Inspiratory muscle work in acute hypoxia influences locomotor muscle fatigue and exercise performance of healthy humans. Am J Physiol Reg Int Comp Physiol. 2007;293(5):R2036–45. - PubMed
    1. Allen DG, Lamb GD, Westerblad H. Skeletal muscle fatigue: cellular mechanisms. Physiol Rev. 2008;88(1):287–332. - PubMed