Abstract
ABSTRACT Aims The use of electromagnetic waves by phototherapy to skeletal muscle presents potential ergogenic effects. The aim of this study was to analyze the effect of using bioceramic clothes on performance, heart rate (HR) and rating of perceived exertion (RPE) during a 10 km race. Our hypothesis is that the use of such clothes modifies these variables. Methods Participants were 10 runners (27.9 ± 4.2 years) who performed two 10 km performances on track under different intervention conditions: bioceramic garments (CER) and placebo garments (PLA). The mean velocity (MV), HR and rate of perceived exertion (RPE) were monitored at each trial. Additionally, partial MV was calculated in three phases: (1) start (first 400 m), (2) middle (400-9600 m) and (3) end (last 400 m). Results MV in CER condition was significantly higher than in PLA condition (11.8 ± 1.0 km·h-1 vs 11.4 ± 1.2 km·h-1; F = 6.200; P = 0.034; ŋp² = 0.408). HR and RPE values in CER condition were not different from PLA condition. Conclusions Our main finding was that the use of bioceramic clothes (CER) increased MV when compared to the PLA condition. Based on these results, bioceramic may be used as an ergogenic resource to increase performance.
Highlights
Participation in street races has increased in the last few years, especially for ten kilometers runs[1]
There was a main effect of the phase of the event in mean velocity (MV) (F = 12.194; P < 0.001; ŋp2 = 0.575), but there no of the condition (F = 0.001; P = 0.979; ŋp2 < 0.001), and there was no significant interaction between the phase and the condition (F = 1.285; P = 0.301; ŋp2 = 0.125)
There was a main effect of the phase of the event in rate of perceived exertion (RPE) (F = 82.392; P < 0.001; ŋp2 = 0.902), but no main effect of the condition (F = 0.585; P = 0.464; ŋp2 = 0.061), and there was no significant interaction between the phase and the condition (F = 0.278; P = 0.761; ŋp2 = 0.030)
Summary
Participation in street races has increased in the last few years, especially for ten kilometers runs[1]. The use of electromagnetic waves by application of light- or radiation-emitting devices (i.e., phototherapy) to skeletal muscle presents potential ergogenic effects, improving contractile function, performance and other aspects related to exercise recovery[3,4]. There are many different ways to apply the phototherapy, such as lasers, light-emitting diodes (LED) and, more recently, garments made up of fibers impregnated with far-infrared emitting nanoparticles (bioceramic)[3,4]. These clothes work as black bodies or perfect absorbers, absorbing and reflecting the infrared energy emitted from the human body[4]. Recent research indicates that bioceramic may produce beneficial effects, such as lowering resting energy expenditure and heart rate (HR), pain relief in patients with inflammatory joint disease, decrease in muscular pain sensation and increased performance in anaerobic tests[5,6,7]
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