karinezag Sport

3-min whole body cryotherapy/cryostimulation after training in the evening improves sleep quality in physically active men.

par SFCCE | 2019 | Publication Sport

Exercise training during evening may disturb sleep patterns and hinder recovery process. The present study aimed to examine the effect of whole body cryotherapy (WBC) exposure after training in the evening on sleep quality and night heart rate variability (HRV). A total of 22 physically active men were randomized to undergo either WBC (3-min at -40°C, wind speed of 2.3 m s-1) or passive recovery (control) following an evening training consisting of 25 min of continuous running at 65% of the maximal aerobic speed (MAS) followed by intermittent running at 85% of the MAS. Each night following the training, the number of movements and HRV during sleeping time were recorded. The next morning, subjective sleep quality and perceived pain were assessed using Spiegel questionnaire and a visual analogue scale, respectively. The number of movements during the night following WBC was significantly reduced (p < 0.05) compared with the control condition. Subjective sleep quality following WBC was significantly better than the control group (p < 0.05). During the estimated slow-wave sleep (SWS), the high frequency power (HF) was higher in the WBC group than the control group (p < 0.05), and the low frequency power (LF) and the LF/HF ratio were lower than the control group (p < 0.05). Pain was significantly reduced following WBC compared to the control (p < 0.01). In conclusion, the use of 3-min WBC after training in the evening improves subjective and objective sleep quality in physically active subjects, which may be due to greater pain relief and improved parasympathetic nervous activity during the SWS period.

Douzi, D, Dupuy, O, Tanneau, M, Boucard, G, Bouzigon, R, Dugué, B. (2019)

Full Article :  https://pubmed.ncbi.nlm.nih.gov/30551730/ 

karinezag Santé

Effects of Whole-Body Cryostimulation (-90°C) on Somnolence and Psychological Well-Being in an Older Patient with Restless Legs Syndrome.

par SFCCE | 2020 | Publication Santé

Background: We aimed at evaluating the feasibility and effects of intense (i.e. -90°C) whole-body cryostimulation (WBC) on somnolence and psychological well-being in an older-adult patient diagnosed with restless legs syndrome (RLS).

Methods: An interrupted time series approach was used in which the efficacy of cryostimulation was evaluated by measuring self-reported fatigue, wake time sleepiness, and well-being several times prior to, during, and after exposure to treatment (i.e. daily 3-min sessions of intense WBC).

Results: No adverse event occurred. Reported levels of sleepiness decreased immediately following the beginning of the treatment phase. In the same time, self-reported well-being significantly increased. Effects sizes were of large magnitude.

Conclusion: In summary, the present study demonstrated that daily exposure to extremely cold air in an enclosed space for 2 weeks was feasible and effective in promoting physical and psychological states in an older patient with sleep disturbances.

Kasmi, S, Filliard, JR, Polidori, G, Bouchet, B, Blancheteau, Y, Legrand, FD. (2020)

Full Article :  https://pubmed.ncbi.nlm.nih.gov/31515948/ 

karinezag Publications, Sport

Effect of an Innovative Mattress and Cryotherapy on Sleep after an Elite Rugby Match

par SFCCE | 2020 | Publication Sport

Introduction: This study aimed to explore the relationship between elite rugby union match and postmatch sleep architecture and to investigate the effects of a high-heat capacity mattress (MAT) and a whole-body cryotherapy (WBC) session on postmatch sleep architecture.

Methods: Nineteen elite male U23 rugby union players performed in three official matches, followed by three experimental conditions, in a randomized order: MAT, WBC, and no intervention (CONT). Match load was evaluated using GPS trackers and video analyses. Sleep architecture was assessed by polysomnography (PSG). Core body temperature (CBT) and mattress surface temperature were monitored during sleep. Linear mixed-effects models were conducted to assess the effects of each experimental condition on sleep, with match load variables as covariates.

Results: A lower wake after sleep onset (β = -10.5 min, P < 0.01) and higher rapid eye movement sleep proportion (β = +2.8%, P < 0.05) were reported for MAT compared with CONT. Moreover, lower mean CBT (β = -0.135°C, P < 0.001) and mean mattress surface temperature (β = -2.736°C, P < 0.001) during sleep were observed for MAT compared CONT. WBC did not affect nocturnal CBT nor interfere with sleep architecture. For every 100-m increase in high-speed running distance, a higher slow wave sleep (β = +1.1%, P = 0.05) and lower light sleep proportion (β = -1.2%, P < 0.05) proportion were observed. Conversely, for every 10 supplementary collisions, lower slow wave sleep (β = -1.9, P = 0.09) and higher light sleep (β = +2.9%, P < 0.001) proportion were observed.

Conclusion: MAT use had a positive effect on sleep architecture after an elite rugby union match, potentially through a more efficient nocturnal heat transfer.

Aloulou, A, Leduc, C, Duforez, F, Piscione, J, Cheradame, J, Bieuzen, F, Thomas, C, Chennaoui, M, VAN Beers, P, Nedelec, M..  (2020)

Full Article :  https://pubmed.ncbi.nlm.nih.gov/32472928/