The Effects of Cold Water Immersion With Different Dosages (Duration and Temperature Variations) on Heart Rate Variability Post-exercise Recovery

Paulista University

Status: Completed

Conditions: Cryotherapy Effect

Treatments: Other: immersion cold water

Study type: Interventional

Funder types: Other

Identifiers

NCT02499640

51903/2012

Details and patient eligibility

About

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.

Enrollment: 100 patients

Sex: Male

Ages: 18 to 30 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• male sex
• healthy
• aged between 18 and 30 years
• classified as physically active through the International Physical Activity Questionnaire

Exclusion criteria

• smokers
• alcoholics
• use drugs that influenced cardiac autonomic activity
• cardiovascular, metabolic or endocrine diseases.

Trial design

Primary purpose: Prevention

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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100 participants in 5 patient groups

GC

No Intervention group

Description:

Control group - CG (n = 20), which suffered no recuperative technique

G1

Experimental group

Description:

G1 (n = 20) was subjected to a recovery procedure by immersion cold water for 5 minutes as from 9±1 degrees Celsius

Treatment:

Other: immersion cold water

G2

Experimental group

Description:

G2 (n = 20) was subjected to a recovery procedure by immersion cold water for 5 minutes as from 14±1 degrees Celsius

Treatment:

Other: immersion cold water

G3

Experimental group

Description:

G3 (n = 20) was subjected to a recovery procedure by immersion cold water for 15 minutes as from 9±1 degrees Celsius

Treatment:

Other: immersion cold water

G4

Experimental group

Description:

G4 (n = 20) was subjected to a recovery procedure by immersion cold water for 15 minutes as from 14±1 degrees Celsius

Treatment:

Other: immersion cold water