李舍予,袁 祥,李雙慶,田浩明
·論著·
·專題研究·
關(guān)注肥胖防控中的睡眠健康
李舍予1*,袁 祥2,李雙慶3,田浩明1
目前肥胖已成為困擾我國(guó)及世界重要的健康問題。雖然已有大量的飲食控制、運(yùn)動(dòng)干預(yù)、藥物和手術(shù)治療廣泛應(yīng)用于肥胖的治療和預(yù)防,但仍難以遏制肥胖快速增長(zhǎng)的流行趨勢(shì)。因此,對(duì)肥胖及其并發(fā)癥的認(rèn)識(shí)亟須創(chuàng)新。近年來,肥胖防控中的睡眠健康問題逐漸受到學(xué)者們的重視。其中,睡眠時(shí)間減少和夜間進(jìn)食障礙作為肥胖的病因和危險(xiǎn)因素,在臨床上被嚴(yán)重低估。同時(shí),肥胖作為以阻塞性睡眠呼吸暫停低通氣綜合征(OSAHS)為代表的某些睡眠障礙的直接病因,在臨床上需要充分的篩查和管控。目前,我國(guó)亟須增加肥胖與睡眠健康的系統(tǒng)性工作,以提供我國(guó)本土的臨床研究資料。
肥胖癥;睡眠;體重;睡眠呼吸暫停,阻塞性
2015年國(guó)家衛(wèi)生和計(jì)劃生育委員會(huì)公布的中國(guó)居民營(yíng)養(yǎng)調(diào)查報(bào)告數(shù)據(jù)顯示,2002—2012年,我國(guó)成年人肥胖和超重的患病率分別由7.1%和22.8%增至11.9%和30.1%,增幅高達(dá)近50%[1]。而在6~17歲的兒童青少年中,肥胖和超重的患病率更是分別由2.1%和4.5%飆升至6.4%和9.6%,增幅分別超過2倍和1倍[1]。這標(biāo)志著我國(guó)已進(jìn)入“肥胖大國(guó)”的行列。肥胖,在2014年被美國(guó)內(nèi)分泌醫(yī)師協(xié)會(huì)(AACE)定性為一種疾病,并被認(rèn)為與糖尿病、冠心病、腦卒中等一系列心腦血管及代謝性疾病密切相關(guān)[2]。我國(guó)肥胖人口的快速增長(zhǎng)大量消耗著國(guó)家社會(huì)經(jīng)濟(jì)資源,肥胖及相關(guān)疾病的疾病負(fù)擔(dān)已成為亟待解決的社會(huì)問題[3-5]。
隨著精準(zhǔn)醫(yī)學(xué)時(shí)代的到來,肥胖逐漸被認(rèn)為是一系列代謝、神經(jīng)、社會(huì)功能、生活方式障礙所致體質(zhì)量增加的綜合征,肥胖的預(yù)防和治療均需要疾病的細(xì)分和綜合化的管理[6]。然而,人們對(duì)肥胖病因及其并發(fā)癥的認(rèn)識(shí)卻遠(yuǎn)遠(yuǎn)不夠。研究者注意到,各國(guó)肥胖流行的增長(zhǎng)與經(jīng)濟(jì)社會(huì)的發(fā)展平行。后者不僅與飲食的改善和體力勞動(dòng)的減少相伴,同時(shí)也與勞動(dòng)者的工作壓力與伴隨而來的睡眠問題密切相關(guān)。部分學(xué)者甚至將壓力及伴隨的睡眠不足與飲食和運(yùn)動(dòng)并列為肥胖預(yù)防的三大基石[7]。近年來不斷有證據(jù)顯示,睡眠障礙不僅可能成為肥胖的潛在病因,肥胖也可能導(dǎo)致某些睡眠相關(guān)并發(fā)癥,如阻塞性睡眠呼吸暫停低通氣綜合征(obstructive sleep apnea hypopnea syndrome,OSAHS)[8]。關(guān)注這些與肥胖相關(guān)的睡眠障礙,對(duì)肥胖及其并發(fā)癥的防治均具有重要的臨床意義。
人類社會(huì)自有記載以來,便對(duì)睡眠產(chǎn)生了濃厚的興趣。然而,對(duì)睡眠本身的定義和最根本的生理意義至今卻還存在爭(zhēng)議。但幾乎可以肯定的是,每個(gè)人均需要睡眠,人為限制睡眠時(shí)間則會(huì)產(chǎn)生不同程度的不適。然而,睡眠時(shí)間減少所帶來的不僅是軀體和精神不適的感覺。最近一項(xiàng)涉及40個(gè)隊(duì)列研究和200萬受試者的系統(tǒng)評(píng)價(jià)提示,相對(duì)每晚睡眠7 h而言,夜間睡眠過多或過少均可能增加全因死亡的風(fēng)險(xiǎn)[9]。睡眠時(shí)間減少還可能增加約37%的糖尿病風(fēng)險(xiǎn),約17%的高血壓風(fēng)險(xiǎn)和約16%的心血管疾病風(fēng)險(xiǎn)[10]。而肥胖則被認(rèn)為是其中最重要的中間過程之一[11]。早在2008年的一項(xiàng)涉及60萬成年人和3萬兒童的系統(tǒng)評(píng)價(jià)就指出,睡眠時(shí)間不足在成年人中可能增加約55%的肥胖風(fēng)險(xiǎn),在兒童中則增加約89%的肥胖風(fēng)險(xiǎn)[12]。
那么,限制睡眠時(shí)間多久才會(huì)引起肥胖呢?美國(guó)賓夕法尼亞大學(xué)的研究團(tuán)隊(duì)在實(shí)驗(yàn)室條件下觀察了200余名健康成年志愿者的睡眠時(shí)間與體質(zhì)量變化的關(guān)系。受試者在經(jīng)過2 d正常睡眠后,其全天睡眠時(shí)間被嚴(yán)格限制在4 h以內(nèi)(每天僅4:00~8:00可以臥床休息)。5 d后,平均每人體質(zhì)量增加了1 kg。而至于體質(zhì)量增加的原因,研究者詳細(xì)記錄了受試者的進(jìn)食種類及數(shù)量,發(fā)現(xiàn)受試者在被限制睡眠時(shí)間后,平均每24 h增加約30%(約合500 kCal)的熱量攝入。而這些額外攝入的食物則絕大多數(shù)是在22:00以后進(jìn)食的高脂肪飲食。所幸的是,在解除限制睡眠時(shí)間后,受試者的進(jìn)食量在1~2 d快速回歸試驗(yàn)開始前的水平[13]。有學(xué)者提出,睡眠時(shí)間減少的情況下能量消耗也許會(huì)不同,熱卡的攝入不能完全解釋體質(zhì)量的變化[14]。于是來自紐約的學(xué)者則在實(shí)驗(yàn)室的條件下,通過檢測(cè)健康成年女性在限制睡眠時(shí)間后的呼吸商(respiratory quotient,RQ),評(píng)估睡眠時(shí)間減少對(duì)基礎(chǔ)代謝率的影響。該研究提示,在睡眠時(shí)間從每天8 h限制到每天4 h以內(nèi)后(也就是覺醒時(shí)間增加了25%),24 h的能量消耗僅增加了約5%[15]。進(jìn)一步的研究表明,限制睡眠時(shí)間后,由于身體的疲憊,日間的自主運(yùn)動(dòng)量會(huì)顯著減少,而實(shí)際進(jìn)行的運(yùn)動(dòng)也相對(duì)未限制睡眠時(shí)間時(shí)更傾向于低強(qiáng)度運(yùn)動(dòng)[16]。而對(duì)于具有2型糖尿病家族史的健康成年人,限制睡眠時(shí)間平均增加約20%的靜坐時(shí)間[17],這無疑可能進(jìn)一步增加其發(fā)生肥胖和糖尿病的風(fēng)險(xiǎn)。而更令人吃驚的是,正常體質(zhì)量的健康男性僅需限制睡眠時(shí)間2 d,進(jìn)食自助早餐后1 h、2 h、3 h血糖水平即會(huì)顯著升高,并出現(xiàn)明顯的胰島素抵抗[18]。當(dāng)然,這可能和限制睡眠時(shí)間后早餐進(jìn)食量增加有關(guān)。另一項(xiàng)研究則觀察到,在打亂睡眠作息3周后,健康成年人的糖代謝也會(huì)發(fā)生異?!礃?biāo)準(zhǔn)餐后血糖水平升高,而早相胰島素分泌出現(xiàn)障礙。所幸的是,經(jīng)過一段時(shí)間的生活調(diào)整,這些糖代謝異常可以得到糾正,但長(zhǎng)期的影響并不清楚[19]。與此同時(shí),通過家庭健康教育保證兒童充分的睡眠時(shí)間,可以顯著減少其每日進(jìn)食量,從而達(dá)到控制體質(zhì)量的目的[20]。這些現(xiàn)象的生理機(jī)制主要與睡眠改變后下丘腦功能及神經(jīng)系統(tǒng)的調(diào)節(jié)有關(guān),李佳琦等[21]對(duì)此作了較為詳細(xì)的綜述。
這些研究明確了睡眠時(shí)間作為肥胖、糖尿病及其并發(fā)癥的重要影響因素。一方面減少睡眠時(shí)間可以通過增加進(jìn)食量、減少運(yùn)動(dòng)量,而增加肥胖及其并發(fā)癥的風(fēng)險(xiǎn),另一方面改善睡眠狀況,可以逆轉(zhuǎn)這一后果。而在臨床工作中,特別是非睡眠??漆t(yī)生,對(duì)睡眠時(shí)間的關(guān)注和干預(yù)并不多。臨床醫(yī)生,特別是內(nèi)分泌科及全科醫(yī)生,如果能夠在臨床實(shí)踐中更多關(guān)注這一可控的危險(xiǎn)因素,及時(shí)建議,必要時(shí)向?qū)?漆t(yī)生轉(zhuǎn)診,可能對(duì)肥胖及其并發(fā)癥的預(yù)防和治療均有積極的意義。
除了減少睡眠時(shí)間可能與覺醒期間進(jìn)食增多有關(guān)外,睡眠相關(guān)進(jìn)食障礙(sleep-related eating disorder,SRED)和夜食癥(night-eating syndrome,NES)也是兩種非常常見且與睡眠和肥胖密切相關(guān)的進(jìn)食障礙[22-23]。SRED和NES均是以晚餐后不恰當(dāng)進(jìn)食和次日清晨食欲降低為特點(diǎn)。但關(guān)鍵區(qū)別在于SRED常出現(xiàn)在睡眠后,在“半睡半醒”的低意識(shí)狀態(tài)下進(jìn)食?;颊叱2荒芑貞涀约阂归g進(jìn)食的狀態(tài),部分患者甚至?xí)M(jìn)食一些有毒有害的食物(如煙頭),或者在進(jìn)食的過程中受傷。而NES則是在晚飯后到睡前這段時(shí)間,在清醒的情況下有意識(shí)地獲取食物。大多數(shù)患者會(huì)堅(jiān)信“空著肚子沒辦法睡覺”,并選擇高脂高糖飲食作為睡前加餐,患者還常伴有情緒低落、失眠等狀況,使得常規(guī)建議很難改變患者的行為。由于這些不恰當(dāng)?shù)倪M(jìn)食后緊接著低能量消耗的睡眠狀態(tài),不難理解兩種進(jìn)食障礙均與肥胖有密切聯(lián)系,其中以NES的研究較多。流行病學(xué)研究提示,NES在健康成年人中的患病率為1.1%~1.5%,而在2型糖尿病患者中的患病率為7.0%~8.4%,在肥胖人群中的患病率為6%~14%[24]。而目前關(guān)于SRED的大型流行病學(xué)調(diào)查較少,WINKELMAN等[25]曾采用便利抽樣法對(duì)217名波士頓大學(xué)學(xué)生通過自我癥狀報(bào)告的形式進(jìn)行調(diào)查,發(fā)現(xiàn)4.6%的學(xué)生存在或曾經(jīng)存在SRED癥狀,但并未報(bào)道在該人群中完全符合SRED診斷標(biāo)準(zhǔn)的患者數(shù)目。而在確診SRED的患者中,約40%合并肥胖[26]。而除卻疾病的范疇,夜間進(jìn)食本身也可能增加約3倍的肥胖風(fēng)險(xiǎn)[27]。
目前,SRED和NES的治療手段有限。但研究提示,有效控制SRED和NES的一些合并癥,如暴食癥、神經(jīng)性貪食、抑郁癥等,對(duì)改善夜間進(jìn)食行為會(huì)有一定幫助,而對(duì)體質(zhì)量的控制也會(huì)起到一定積極作用[28]。此外,抗驚厥藥物托吡酯(topiramate)被證實(shí)對(duì)SRED與NES患者的夜間進(jìn)食行為有所改善,并能顯著降低患者體質(zhì)量[29]。美國(guó)指南建議對(duì)準(zhǔn)備接受減重手術(shù)的肥胖患者,術(shù)前應(yīng)進(jìn)行包括NES在內(nèi)的進(jìn)食障礙的評(píng)估,并在術(shù)后接受規(guī)律行為治療[30]。而我國(guó)目前對(duì)該領(lǐng)域的關(guān)注度尚不足??傊归g進(jìn)食障礙在肥胖患者中并不少見,卻被嚴(yán)重低估。而有效篩查與干預(yù)夜間進(jìn)食障礙,對(duì)改善患者體質(zhì)量將有積極的作用。相反,無視夜間進(jìn)食障礙則可能導(dǎo)致常規(guī)飲食運(yùn)動(dòng)干預(yù)效果不佳,甚至減重手術(shù)術(shù)后復(fù)重。
睡眠障礙增加肥胖風(fēng)險(xiǎn)的同時(shí),肥胖也會(huì)增加一些睡眠障礙的風(fēng)險(xiǎn)。其中,OSAHS就是目前被關(guān)注最多的一種。OSAHS是以睡眠期間氣道梗阻所致的通氣量降低、低氧血癥、睡眠結(jié)構(gòu)變化,而導(dǎo)致日間嗜睡的睡眠呼吸疾病,與糖尿病、心腦血管疾病、猝死等風(fēng)險(xiǎn)增加有關(guān)[31]。肥胖是OSAHS最主要的病因之一,而OSAHS也是肥胖最常見的并發(fā)癥之一。研究顯示,肥胖患者中OSAHS的患病率可高達(dá)60%~90%,而其中相當(dāng)比例并未得到應(yīng)有的診斷[32-33]。最近張潤(rùn)等[34]對(duì)600余例非解剖異常OSAHS患者的體質(zhì)指數(shù)(body mass index,BMI)情況與疾病嚴(yán)重程度進(jìn)行了分析,不僅證實(shí)了OSAHS嚴(yán)重程度隨BMI增加而增加,同樣也指出在BMI較高的人群,體位對(duì)疾病嚴(yán)重程度的影響逐漸降低,進(jìn)一步提示高BMI的OSAHS患者很難從單純的體位改變中獲益,從而需要更為積極的治療。
由于肥胖與OSAHS高度相關(guān),指南也在擬接受減重手術(shù)的肥胖患者中建議常規(guī)篩查OSAHS[30]。OSAHS的確診有賴于整夜多導(dǎo)睡眠圖(polysomnograph,PSG),而篩查則首選便攜式診斷儀器對(duì)經(jīng)皮血氧飽和度、口鼻氣流、鼾聲、胸腹運(yùn)動(dòng)等進(jìn)行單獨(dú)或聯(lián)合監(jiān)測(cè)[31]。胡碧等[35]對(duì)整夜單純經(jīng)皮氧分壓監(jiān)測(cè)對(duì)于代謝綜合征患者OSAHS的篩查和診斷價(jià)值進(jìn)行了研究,并指出其與整夜PSG的結(jié)果具有高度一致性。而經(jīng)皮氧分壓監(jiān)測(cè)成本低廉和簡(jiǎn)單便攜,更適合在基層醫(yī)療機(jī)構(gòu)和非??漆t(yī)院推廣,對(duì)于篩查后疑診患者必要時(shí)再推薦轉(zhuǎn)診至??漆t(yī)生處理。
根據(jù)指南推薦,持續(xù)氣道正壓通氣(coutinuous positive airway pressure,CPAP)是非解剖異常OSAHS的首選治療方式[31]。而降低體質(zhì)量,不管是通過生活方式干預(yù),藥物治療,還是減重手術(shù),均對(duì)改善OSAHS病情有積極的作用[36-38]。而對(duì)于重度肥胖患者,減重手術(shù)對(duì)OSAHS的改善效果甚至優(yōu)于CPAP[39]。這提示,控制體質(zhì)量對(duì)肥胖患者OSAHS的治療意義更為重要。
事實(shí)上,肥胖與睡眠的關(guān)系還很復(fù)雜。如晝夜輪班工作(shift working)與肥胖的關(guān)系作為職業(yè)衛(wèi)生領(lǐng)域的熱點(diǎn)研究之一,也受到學(xué)界的關(guān)注。研究提示,晝夜輪班工作相關(guān)的作息不規(guī)律可以顯著增加肥胖的風(fēng)險(xiǎn)[40]。如醫(yī)院護(hù)士夜班次數(shù)越多,其肥胖的可能性也就越高[41]。此外,夜間睡眠時(shí)的環(huán)境光線過強(qiáng)也可能與體質(zhì)量增加有關(guān)[42]。在小樣本研究中,多種睡眠障礙(如不寧腿綜合征等)均與肥胖存在明顯的相關(guān)性[43]。但由于這些睡眠障礙常合并與肥胖高度相關(guān)的疾病(如不寧腿綜合征常合并睡眠相關(guān)進(jìn)食障礙、抑郁癥相關(guān)失眠常合并暴食癥等),因此其與肥胖的因果關(guān)系目前尚很難確定。
總之,關(guān)注睡眠健康在肥胖的治療和預(yù)防中均具有至關(guān)重要的作用。睡眠不足和睡眠進(jìn)食障礙均是肥胖的重要原因,而另一些睡眠障礙(特別是睡眠呼吸障礙)卻是肥胖的并發(fā)癥。因此,關(guān)注肥胖患者睡眠的不同側(cè)面,及時(shí)進(jìn)行睡眠健康管理,如建議患者保證充足睡眠,給予行為和藥物治療等,均可能對(duì)肥胖患者的減重治療起到輔助作用。而作為基層醫(yī)療工作者和疾病預(yù)防工作者,及早識(shí)別人群中的睡眠健康問題,可能對(duì)減少肥胖人群比例有積極的意義。而我國(guó)目前相關(guān)研究仍處于起步階段,需要更多系統(tǒng)性的工作提供基于我國(guó)本土的臨床研究資料。
作者貢獻(xiàn):李舍予進(jìn)行文章的策劃,撰寫論文,負(fù)責(zé)文章的質(zhì)量控制及審校,對(duì)文章整體負(fù)責(zé),監(jiān)督管理;袁祥進(jìn)行文獻(xiàn)檢索;李雙慶、田浩明對(duì)本文提供了關(guān)鍵性意見和建議。
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(本文編輯:陳素芳)
Sleeping Health in Obesity Prevention and Management
LIShe-yu1*,YUANXiang2,LIShuang-qing3,TIANHao-ming1
1.DepartmentofEndocrinologyandMetabolism,WestChinaHospital,SichuanUniversity,Chengdu610041,China2.WestChinaMedicalSchool,SichuanUniversity,Chengdu610041,China3.DepartmentofGeneralMedicine,WestChinaHospital,SichuanUniversity,Chengdu610041,China
*Correspondingauthor:LIShe-yu,Associateprofessor,Mastersupervisor;E-mail:lisheyu@gmail.com
Obesity is now a crucial health problem worldwide.Even with the abundant methods of dietary control,exercise intervention,drug therapy and bariatric surgery for the treatment and prevention of obesity,the prevalence is still growing rapidly.The updated understanding of obesity and its complications is desperately needed.In recent years,investigators have been focusing on sleeping health care in the prevention and treatment of obesity.Sleep restriction and eating disorders during sleep time contribute critically to obesity and its complications,while obstructive sleep apnea hypopnea syndrome(OSAHS) and some other sleeping disorders result from obesity.More domestic and systemic study is required about sleeping health in obesity prevention and management in China.
Obesity;Sleep;Body weight;Sleep apnea,obstructive
本期“專題研究主持人”簡(jiǎn)介
現(xiàn)任中華醫(yī)學(xué)會(huì)糖尿病學(xué)分會(huì)肥胖與糖尿病學(xué)組委員,四川省預(yù)防醫(yī)學(xué)會(huì)內(nèi)分泌代謝性疾病防控分會(huì)秘書長(zhǎng)。Medicine、Acta Diabetologica、Journal of Diabetes、Scientific Reports、JMIR、JMU、BMJ Open、《中國(guó)循證醫(yī)學(xué)雜志》、《中國(guó)全科醫(yī)學(xué)》等學(xué)術(shù)期刊審稿人。第一作者或通信作者發(fā)表科研論文30余篇,參編專著1本。作為項(xiàng)目負(fù)責(zé)人主持國(guó)家自然科學(xué)基金1項(xiàng),四川省衛(wèi)生廳/衛(wèi)計(jì)委科研課題2項(xiàng)。
國(guó)家自然科學(xué)基金資助項(xiàng)目(81400811,21534008)
R 195
A
10.3969/j.issn.1007-9572.2017.11.002
2017-03-07;
2017-03-10)
【編者按】 目前,肥胖已成為困擾我國(guó)及世界重要的健康問題,并對(duì)現(xiàn)有衛(wèi)生體系提出了嚴(yán)峻的挑戰(zhàn),而全科醫(yī)生在肥胖防控工作中的地位更加凸顯。除了傳統(tǒng)的飲食、運(yùn)動(dòng)、藥物和手術(shù)治療,近年來人們逐漸注意到睡眠健康在肥胖及其并發(fā)癥預(yù)防和治療的臨床意義。同時(shí),肥胖本身也是睡眠障礙的重要病因。本期“專題研究”組織多學(xué)科專家,圍繞睡眠健康與肥胖的相互關(guān)系進(jìn)行探討,以期為臨床、衛(wèi)生工作者對(duì)肥胖預(yù)防與治療方面的睡眠健康問題的認(rèn)識(shí)提供參考。
李舍予 醫(yī)學(xué)博士,四川大學(xué)華西醫(yī)院內(nèi)分泌代謝科副教授、碩士研究生導(dǎo)師,主要研究方向:糖尿病與肥胖的基礎(chǔ)與臨床研究。
1.610041四川省成都市,四川大學(xué)華西醫(yī)院內(nèi)分泌代謝科
2.610041四川省成都市,四川大學(xué)華西臨床醫(yī)學(xué)院
3.610041四川省成都市,四川大學(xué)華西醫(yī)院全科醫(yī)學(xué)科
*通信作者:李舍予,副教授,碩士研究生導(dǎo)師;E-mail:lisheyu@gmail.com
李舍予,袁祥,李雙慶,等.關(guān)注肥胖防控中的睡眠健康[J].中國(guó)全科醫(yī)學(xué),2017,20(11):1282-1287.[www.chinagp.net]
LI S H,YUAN X,LI S Q,et al.Sleeping health in obesity prevention and management[J].Chinese General Practice,2017,20(11):1282-1287.