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Title: | The effects of direct current stimulation on exercise performance, pacing and perception in temperate and hot environments |
Authors: | Barwood, MJ Butterworth, J Corbett, J Goodall, S House, JR Laws, R Nowicky, AV |
Keywords: | Anodal stimulation;Fixed and self-paced exercise;Environmental temperature |
Issue Date: | 2016 |
Publisher: | Elsevier |
Citation: | Brain Stimulation, (2016) |
Abstract: | Background. Transcranial direct current stimulation (tDCS) is a non-invasive neuromodulatory technique and has previously been shown to enhance submaximal exercise by reducing rating of perceived exertion (RPE). The present study examined the effects of tDCS on high-intensity self-paced exercise in temperate conditions and fixed followed by maximal exercise in the heat; it was hypothesised performance and RPE would be altered. Methods. Two separate studies were undertaken in which exercise was preceded by 20-minutes of sham tDCS (SHAM), or anodal tDCS (TDCS). Study 1: six males completed a 20-km cycling time trial, on two occasions. Power output (PO), RPE, O2 pulse, and heart rate (HR) were measured throughout. Study 2: eight males completed fixed intensity cycling exercise at 55% of a pre-determined maximal power output (PMax) for 25-minutes before undertaking a time to exhaustion test (TTE; 75% PMax) in hot conditions (33°C), on two occasions. Test duration, heart rate, thermal and perceptual responses were measured. Study specific and combined statistical analyses was undertaken and effect sizes established.. Results. Study 1: mean PO was not improved with the tDCS (197 ± 20 W) compared to SHAM (197 ± 12 W) and there were no differences in pacing profile HR, O2 pulse or RPE (p > .05). Study 2: TTE duration (SHAM 314 ± 334 s cf 237 ± 362 s tDCS), thermal, heart rate and perceptual responses were unchanged by tDCS compared to SHAM (p > .05). When combined, performance in the SHAM trial tended to better than the tDCS. Conclusion. tDCS did not influence cycling performance (study 1) exercise tolerance (study 2) or perception (studies 1&2). tDCS does not appear to facilitate high intensity exercise performance or exercise performance in the heat. |
URI: | http://www.sciencedirect.com/science/article/pii/S1935861X1630198X http://bura.brunel.ac.uk/handle/2438/13006 |
DOI: | http://dx.doi.org/10.1016/j.brs.2016.07.006 |
ISSN: | 1935-861X |
Appears in Collections: | Dept of Health Sciences Research Papers |
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