Abstract
Transcranial direct current stimulation (tDCS) is used to modulate brain function, and can modulate motor and postural control. While the acute effect of tDCS is well documented on patients, little is still known whether tDCS can alter the motor control of healthy trained participants. This study aimed to assess the acute effect of tDCS on postural control of parkour practitioners, known for their good balance abilities and their neuromuscular specificities that make them good candidates for tDCS intervention. Eighteen parkour practitioners were tested on three occasions in the laboratory for each stimulation condition (2 mA; 20 minutes)–primary motor cortex (M1), dorsolateral prefrontal cortex (dlPFC) and sham (placebo). Postural control was evaluated PRE and POST each stimulation by measuring Center of Pressure (CoP) displacements on a force platform during static conditions (bipedal and unipedal stance). Following M1 stimulation, significant decreases were observed in CoP area in unipedal (from 607.1 ± 297.9 mm2 to 451.1 ± 173.9 mm2, P = 0.003) and bipedal (from 157.5 ± 74.1 mm2 to 117.6 ± 59.8 mm2 P<0.001) stances. As well, the CoP total length was significantly reduced in bipedal (from 3416.8 ± 295.4 mm to 3280.6 ± 306.2 mm, P = 0.005) as well as in unipedal stance (from 4259.6 ± 398.4 mm to 3846.5 ± 468.9 mm, P<0.001), only after M1 stimulation. Relative pre-post changes observed after M1 stimulation were negatively correlated to experience in parkour only after unipedal stance (r = 0.715, P<0.001), meaning that the more participants were trained the less tDCS was effective. No significant changes were noticed after sham and dlPFC stimulation. These results suggested that the modulation of gait performance in athletes following an acute intervention of tDCS is specific to the targeted brain region, and that postures with reduced base of support (such as unipedal stance) were more sensitive to tDCS.
Funder
APICHU of Besançon Hospital
Publisher
Public Library of Science (PLoS)
Reference46 articles.
1. Brain regions and genes affecting postural control;R Lalonde,2007
2. The effectiveness of physiotherapy treatment on balance dysfunction and postural instability in persons with Parkinson’s disease: A systematic review and meta-analysis;A Yitayeh;BMC Sports Sci Med Rehabil.,2016
3. Excitability changes induced in the human motor cortex by weak transcranial direct current stimulation;MA Nitsche;J Physiol,2000
4. Effect of transcranial direct current stimulation on cortico-muscular coherence and standing postural steadiness.;A Dutta;Proceedings of the IASTED International Conference on Assistive Technologies, AT 2012.,2012
5. Effects of transcranial direct current stimulation (tDCS) on balance improvement: a systematic review and meta-analysis.;Hazime FA de Moura MCDS;Somatosens Mot Res.,2019