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cyphose lombaire progressive et mouvements périodiques des jambes / cancer et sommeil / reorganisation corticale et sommeil / Obésité et sommeil

Vous trouverez ci-dessous, les résumés et références de certains articles relatifs au sommeil, en instance de parution, annoncés sur Pubmed.

-La revue Psycho-oncology publie une étude ayant trait aux effets des traitements par radiothérapie sur le sommeil des patients atteints de cancer du sein ou de la prostate pour légitimer une prise en charge liminaire des troubles du sommeil de ces patients.

-La revue Brain Cognition interroge  la réorganisation corticale chez l’adolescent à partir d’une étude des caractéristiques des données EEG en sommeil lent.

-La revue Movement disorders publie une étude qui explore le sommeil de patients atteints de la maladie de Parkinson et souffrant de cyphose lombaire progressive.

-Un article de la revue Current Sports Medicine Reports attire l’attention sur le cercle vicieux que constituent un sommeil perturbé, le défaut d’activité physique et l’obésité et souligne le fait qu’une meilleure connaissance de ces co-morbidités  par les médecins jouerait en faveur d’une meilleure prise en charge des patients.

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Psycho-oncology. 2009 Nov 2.

 

Disrupted sleep in breast and prostate cancer patients undergoing radiation therapy: the role of coping processes.

Thomas KS, Bower J, Hoyt MA, Sepah S.

Department of Psychology, Pitzer College, Claremont, CA, USA.

Background: Sleep problems are a common complaint in cancer patients that have been understudied. Methods: This study examined changes in sleep in 33 breast cancer (BC) patients and 23 prostate cancer (PC) patients during radiation therapy and over a 6-month followup. Coping processes were examined as predictors of sleep. Self-reported sleep was assessed at eight time-points before, during, and after treatment using the Medical Outcomes Study-Sleep Scale. The COPE Scale was used to assess coping processes before treatment onset. Results: Mixed effects linear modeling analyses revealed that both BC and PC patients reported the most sleep problems prior to and during the early weeks of treatment. Coping strategies predicted sleep trajectories in both groups. In particular, approach coping predicted better sleep in PC patients, whereas avoidance coping predicted worst sleep in both PC and BC patients (p's<0.05). Conclusion: These findings highlight the importance of evaluating sleep in patients as they undergo treatment for cancer. Additionally, they suggest that interventions aimed at increasing the use of approach-oriented coping strategies may improve sleep and quality of life in these patients. Copyright (c) 2009 John Wiley & Sons, Ltd.

 

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Brain Cognition. 2009 Oct 31. [Epub ahead of print]

Sleep EEG changes during adolescence: An index of a fundamental brain reorganization.

Feinberg I, Campbell IG.

Department of Psychiatry and Behavioral Science, University of California, Davis, United States.

 

Delta (1-4Hz) EEG power in non-rapid eye movement (NREM) sleep declines massively during adolescence. This observation stimulated the hypothesis that during adolescence the human brain undergoes an extensive reorganization driven by synaptic elimination. The parallel declines in synaptic density, delta wave amplitude and cortical metabolic rate during adolescence further support this model. These late brain changes probably represent the final ontogenetic manifestation of nature's strategy for constructing nervous systems: an initial overproduction of neural elements followed by elimination. Errors in adolescent brain reorganization may cause mental illness; this could explain the typical age of onset of schizophrenia. Longitudinal studies of sleep EEG are enhancing our knowledge of adolescent brain maturation. Our longitudinal study of sleep EEG changes in adolescence showed that delta power, which may reflect frontal cortex maturation, begins its decline between ages 11 and 12years and falls by 65% by age 17years. In contrast, NREM theta power begins its decline much earlier. Delta and theta EEG frequencies are important to sleep theory because they behave homeostatically. Surprisingly, these brain changes are unrelated to pubertal maturation but are strongly linked to age. In addition to these (and other) maturational EEG changes, sleep schedules in adolescence change in response to a complex interaction of circadian, social and other influences. Our data demonstrate that the daytime sleepiness that emerges in adolescence is related to the decline in NREM delta as well as to altered sleep schedules. These longitudinal sleep data provide guideposts for studying cognitive and behavioral correlates of adolescent brain reorganization.

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Movement  Disorders  2009 Nov 4.

Periodic leg movements and REM sleep without atonia in Parkinson's disease with camptocormia.

Lavault S, Bloch F, Houeto JL, Konofal E, Welter ML, Agid Y, Arnulf I.

Unité des Pathologies du Sommeil, Groupe Hospitalier Pitié-Salpêtrière, Assistance Publique - Hôpitaux de Paris, Paris, France.

Camptocormia (a flexion of the trunk that only appears when standing or walking) affects a minority of patients with Parkinson's disease (PD). As it responds poorly to levodopa and is associated with reduced midbrain and pons volume, it may result from non-dopaminergic, brainstem lesions. As several sleep abnormalities in PD also result from non-dopaminergic brainstem lesions, we monitored sleep in 24 non-demented PD patients with (n = 12) and without (n = 12) camptocormia and in 12 controls. Nearly half (42%) patients with camptocormia had abnormal periodic leg movement indices (>15/h), versus 17% patients without camptocormia and 8% of controls (p = 0.02). In addition, the percentage of enhanced muscle activity during REM sleep (measured on the chin and on the limb muscles) tended to be higher in patients with than without camptocormia (51 +/- 39% vs. 20 +/- 25%, p = 0.06). The other sleep and REM sleep characteristics (sleep and REM sleep onset latencies, sleep time and sleep stage percentages, REMs density, arousal, and apnea-hypopnea indices) were not different between these two PD groups. Lesions causing this axial dystonia may spare the sleep systems but affect the control of movements during sleep. (c) 2009 Movement Disorder Society.

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Current Sports Medicine Reports

The Role of Sleep Dysfunction in Physical Inactivity and its Relationship to Obesity.

Watenpaugh DE.

Sleep Consultants, Inc., Fort Worth, TX; University of North Texas Health Science Center, Department of Integrative Physiology, Fort Worth, TX.

Natural selection defined our genotype as athletes who sleep 8-9 h each night. Physical activity and sleep exhibit positive synergy, whereby each optimizes quality of and capability for the other. Our sedentary, sleep-restricted lifestyle conflicts with our genotype to generate pathophysiologic phenotypes, especially obesity. Insufficient sleep is pandemic, and other sleep disorders are increasingly common. Sleep dysfunction promotes obesity due to inactivity from sleepiness and to metabolic changes. Obesity is the primary risk factor for obstructive sleep apnea, which commonly disrupts sleep. This represents one of many pathophysiologic vicious cycles involving inactivity, sleep disorders, and obesity. Solutions include better education of the medical community, which remains surprisingly ignorant about these disease processes and therapeutic advantages of exercise and sleep repletion. Doctors commonly prescribe medications with sleep disruption or weight-gain side effects instead of lifestyle modifications. Lifestyle improvements often provide superior treatment to medications and impose no side effects.

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Groupe Santé Sommeil

Le groupe médical Santé Sommeil a pour vocation de diagnostiquer et traiter les troubles du sommeil et de la veille chez l’adulte et l’enfant.