Background:Recovery methods are common used in sports to improve the performance of athletes. Cold Water Immersion (CWI) is emphasized in this scenario, obtaining gains in the
recovery of several variables, as like as in clinical variables. However, the applicability is also influential in psychological variables thereby placebo effect must be studied to better understand
the actual effectiveness of the technique.
Methods:Cross-over study type performed in a period of 4 weeks. The sample was composed of 10 male athletes of high performance allocated randomly into two groups : placebo group
(PG) and experimental group (EG) . Subjects remained with their training routine with frequency of six times a week. The intervention occurred at the end of each physical training four times a week
where PG participants were immersed in thermo neutral water ( 15 min, 27 ° C) with the addition of an oil, which was originally reported as being effective in the recovery process as well as CWI, and
the EG participants underwent CWI (15 min, 13 ° C). After two weeks the groups changed the interventions between them. The variables analyzed were pain perception, perception of recovery and
psychological questionnaire, these were collected at baseline and after the 2nd and 4th weeks of training. The distribution was tested for normality by the Shapiro -Wills test. For the analysis of
moments (pre vs. post-intervention) was used paired t test and for comparison between groups (CWI vs placebo) t test was used unpaired. The level of significance was set at p < 0.05 for all tests.
Results:For items of psychological questionnaire was statistically significant difference between the PG moments for the physically ready outcome (Mean values and standard deviation
of the pre and post-intervention: 6.08 ± 3.42 , 8.76 ± 1.09 ), indicating an improvement of the physical condition , and muscle pain outcome to EG, where at the time post-intervention values are
presented lower (mean values and standard deviation of the pre and post-intervention : 4.32 ± 3.96 , 0.58 ± 0.46) . There was no statistically significant difference between groups. For clinical,
pain perception and perception of recovery, there was no statistically significant difference between the groups and between times.
Conclusions:It can be concluded that CWI compared to placebo has a tendency to improvement in pain after systematic application, but to the other points is not presented as a superior