The Effects of Cold Water Immersion With Different Dosages (Duration and Temperature Variations) on Heart Rate Variability Post-exercise Recovery
- Conditions
- Cryotherapy Effect
- Interventions
- Other: immersion cold water
- Registration Number
- NCT02499640
- Lead Sponsor
- Paulista University
- Brief Summary
The aim of the present study was to investigate the effects of cold water immersion (CWI) during post-exercise recovery with different durations and temperatures on heart rate variability (HRV) indices. 100 participants performed a protocol of jumps and a Wingate test, and immediately afterwards were immersed in cold water, according to the characteristics of each group (CG: control; G1: 5' at 9±1°C; G2: 5' at 14±1°C; G3: 15' at 9±1°C; G4: 15' at 14±1°C). Analyses were performed at baseline, during the recuperative technique (TRec) by CWI and 20, 30, 40, 50 and 60 minutes post-exercise. The HRV indices average of all RR intervals in each analysis period (Mean RR), standard deviation of normal R-R intervals (SDNN), square root of the mean of the sum of the squares of differences between adjacent R-R intervals (RMSSD), spectral components of very low frequency (VLF), low frequency (LF) and high frequency (HF), scatter of points perpendicular to the line of identity of the Poincaré Plot (SD1) and scatter points along the line of identity (SD2) were assessed. Comparisons between groups and moments were performed using the technique of analysis of variance for repeated measures in two scheme factors. A significance level of p\<0.05 was considered.
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Male
- Target Recruitment
- 100
- male sex
- healthy
- aged between 18 and 30 years
- classified as physically active through the International Physical Activity Questionnaire
- smokers
- alcoholics
- use drugs that influenced cardiac autonomic activity
- cardiovascular, metabolic or endocrine diseases.
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description G1 immersion cold water G1 (n = 20) was subjected to a recovery procedure by immersion cold water for 5 minutes as from 9±1 degrees Celsius G3 immersion cold water G3 (n = 20) was subjected to a recovery procedure by immersion cold water for 15 minutes as from 9±1 degrees Celsius G2 immersion cold water G2 (n = 20) was subjected to a recovery procedure by immersion cold water for 5 minutes as from 14±1 degrees Celsius G4 immersion cold water G4 (n = 20) was subjected to a recovery procedure by immersion cold water for 15 minutes as from 14±1 degrees Celsius
- Primary Outcome Measures
Name Time Method Change from Baseline in indices of heart rate variability at 60 minutes 20, 30, 40, 50 and 60 minutes post-exercise
- Secondary Outcome Measures
Name Time Method