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Afferent information from exercising muscle contributes to the sensation of exercise-induced muscle pain. Transcutaneous electrical nerve stimulation (TENS) delivers low–voltage electrical currents to the skin, inhibiting nociceptive afferent information. The use of TENS in reducing perceptions of exercise-induced pain has not yet been fully explored. This study aimed to investigate the effect of TENS on exercise-induced muscle pain, pacing strategy, and performance during a 5-km cycling time trial (TT).   Methods:  On three separate occasions, in a single-blind, randomized, and cross-over design, 13 recreationally active participants underwent a 30-min TENS protocol, before performing a 5-km cycling TT. TENS was applied to the quadriceps prior to exercise under the following conditions; control (CONT), placebo with sham TENS application (PLAC), and an experimental condition with TENS application (TENS). Quadriceps fatigue was assessed with magnetic femoral nerve stimulation assessing changes in potentiated quadriceps twitch force at baseline, pre and post exercise. Subjective scores of exertion, affect and pain were taken every 1-km.   Results:  During TTs, application of TENS did not influence pain perceptions ( P  = 0.68,η    p    2= 0.03). There was no significant change in mean power ( P  = 0.16,η    p    2= 0.16) or TT duration ( P  = 0.17,η    p    2= 0.14), although effect sizes were large for these two variables. Changes in power output were not significant but showed moderate effect sizes at 500-m (η    p    2= 0.10) and 750-m (η    p    2= 0.10). Muscle recruitment as inferred by electromyography data was not significant, but showed large effect sizes at 250-m (η    p    2= 0.16), 500-m (η    p    2= 0.15), and 750-m (η    p    2= 0.14). This indicates a possible effect for TENS influencing performance up to 1-km.   Discussion:  These findings do not support the use of TENS to improve 5-km TT performance.

No Influence of Transcutaneous Electrical Nerve Stimulation on Exercise-Induced Pain and 5-Km Cycling Time-Trial Performance