Effect of Daily Cold Water Immersion on Heart Rate Variability and Subjective Ratings of Well-Being in Highly Trained Swimmers
Autor: | Jonathan Parouty, Martin Buchheit, Hani Al Haddad |
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Rok vydání: | 2012 |
Předmět: |
medicine.medical_specialty
Cross-Over Studies Supine position Quality of sleep Physical Therapy Sports Therapy and Rehabilitation Crossover study Cold Temperature Heart Rate Parasympathetic Nervous System Physical Fitness Water immersion Immersion Physical therapy medicine Humans Heart rate variability Orthopedics and Sports Medicine Training load Sleep Psychology Swimming Hydrotherapy Morning |
Zdroj: | International Journal of Sports Physiology and Performance. 7:33-38 |
ISSN: | 1555-0273 1555-0265 |
Popis: | Purpose:We investigated the effect of daily cold water immersion (CWI), during a typical training week, on parasympathetic activity and subjective ratings of well-being.Methods:Over two different weeks, eight highly trained swimmers (4 men; 19.6 ± 3.2 y) performed their usual training load (5 d/wk, approx. 21 h/wk). Last training session of each training day was immediately followed by 5 min of seated recovery, in randomized order, with CWI (15°C) or without (CON). Each morning before the first training session (6:30 AM) during the two experimental weeks, subjective ratings of well-being (eg, quality of sleep) were assessed and the R-R intervals were recorded for 5 min in supine position. A vagal-related index (ie, natural logarithm of the square root of the mean of the sum of the squares of differences between adjacent normal R-R intervals; Ln rMSSD) was calculated from the last 3-min segment.Results:Compared with CON, CWI effect on Ln rMSSD was rated as possibly beneficial on day 2 [7.0% (–3; 19)], likely beneficial on day 3 [20.0% (1.5; 43.5)], very likely beneficial on day 4 [30.4% (12.2; 51.6)] and likely beneficial on day 5 [24.1% (–0.4; 54.8)]. Cold water immersion was associated with a likely greater quality of sleep on day 2 [30.0% (2.7; 64.6)], very likely on day 3 [31.0% (5.0; 63.1)] and likely on day 4 [38.6% (11.4; 72.4)] when compared with CON.Conclusion:Five minutes of CWI following training can reduce the usual exercise-induced decrease in parasympathetic activity and is associated with improved rating of perceived sleep quality. |
Databáze: | OpenAIRE |
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