AbstractIteviedthorelationbetweenosteosarcopenicadiposityOSA)ndfrailtyintesofteirepdemiologicalstatus,isk factors,pathogesisndcliicaltreatment.istovideanperspctivefoliicalprevetionadmaagementadduce the negative impacts in the comorbid state.
Keywordsosteosarcopenic adiposity; frailty; epidemiology; risk factors;pathogenesis; review
摘要從骨量-肌量減少性肥胖(OSA)和衰弱的流行病學(xué)現(xiàn)狀、危險(xiǎn)因素、發(fā)病機(jī)制和臨床治療相關(guān)性進(jìn)行綜述,旨在為臨床預(yù)防和管理提供新視角,降低共病狀態(tài)的負(fù)面影響。
關(guān)鍵詞骨量-肌量減少性肥胖;衰弱;流行病學(xué);危險(xiǎn)因素;發(fā)病機(jī)制;綜述
doi:10.12102/j.issn.1009-6493.2025.13.025
人口老齡化趨勢(shì)明顯,預(yù)計(jì)到2050年60歲及以上人口將占全球人口的 21.4%[1] ,老年人群健康問(wèn)題亟須關(guān)注。2014年Ilich等2首次提出骨量-肌量減少性肥胖(osteosarcopenicadiposity,OSA)的概念,指骨骼、骨骼肌和脂肪組織結(jié)構(gòu)和功能的綜合受損,反映了骨質(zhì)疏松癥(osteoporosis,OP)肌少癥(sarcopenia,SP)和肥胖3種疾病的共存,OSA揭示了骨骼、肌肉和代謝系統(tǒng)之間復(fù)雜的交互作用。衰弱被定義為多系統(tǒng)功能衰退和生理儲(chǔ)備能力整體下降的老年綜合征。當(dāng)骨質(zhì)疏松癥、肌少癥和肥胖中任意兩者共存,衰弱的患病率更高,衰弱的老年人會(huì)加劇骨量、肌量流失和肥胖問(wèn)題。研究發(fā)現(xiàn),養(yǎng)老院中 10% 的老年人肌少癥和衰弱共存[3,這增加了骨折、活動(dòng)障礙和死亡的風(fēng)險(xiǎn)。單一治療某一疾病難以達(dá)到預(yù)期效果,多病共治已成為首要措施。因此,對(duì)OSA和衰弱的相關(guān)性進(jìn)行綜述,以期提高對(duì)兩者的認(rèn)識(shí),為臨床防治提供新的策略和方法。
1骨量-肌量減少性肥胖和衰弱的流行病學(xué)現(xiàn)狀
1.1骨量-肌量減少性肥胖的流行病學(xué)現(xiàn)狀
老年人OSA患病率持續(xù)升高,給全球醫(yī)療體系帶來(lái)沉重負(fù)擔(dān)。Liu等4的Meta分析顯示,全球中老年人(?45 歲OSA患病率為 8% ,其中女性為 9% ,男性為5% 。全球患病率在區(qū)域分布上差異顯著,伊朗約為19.8%[5] ,而韓國(guó)僅為 4.1%[6] 。Stefanaki等[7]對(duì) 18~21 歲參與者的調(diào)查顯示,肥胖組的肌量和骨量減少更明顯,表明OSA患病人群已趨向年輕化,應(yīng)引起重視。
我國(guó)關(guān)于OSA患病率的研究較少。Ma等的研究中60歲及以上人群OSA患病率為 10.2% 。對(duì)廣西壯族自治區(qū)20~95歲女性的調(diào)查顯示, lt;60 歲與 ?60 歲女性O(shè)SA患病率分別為 0.34% 和 7.44% ,毛南族、么佬族和苗族老年人OSA患病率分別為 4.9%.12.6% 和 11.5%[9] 。由此可見(jiàn),OSA患病率隨年齡增加而升高,且在不同族群間存在差異。這可能與生活習(xí)慣等多種因素有關(guān),具體原因還需進(jìn)一步研究。
1.2衰弱的流行病學(xué)現(xiàn)狀
衰弱作為一種新興的全球健康挑戰(zhàn),其患病率在不同地區(qū)存在顯著差異。Ofori-Asenso等[的系統(tǒng)評(píng)價(jià)顯示,60歲及以上社區(qū)老年人衰弱的全球患病率為43.4% ,英國(guó)老年人衰弱患病率為 8.1%[11] ,印度尼西亞老年人為 26.8%[12] ,而印度老年人高達(dá) 42.3%[13] ,這種差異可能與發(fā)達(dá)國(guó)家健全的醫(yī)療保障體系和完善的社會(huì)支持網(wǎng)絡(luò)有關(guān)。
在我國(guó),衰弱患病率隨人口老齡化程度逐年攀升。2003—2010年,我國(guó)衰弱患病率為 9.1% ,2011—2018年提高至 14.4%[14] 。橫斷面研究顯示,我國(guó)老年人衰弱和衰弱前期患病率分別為 9.5% 和 46.1%[15] ,表明老年人多處于健康狀態(tài)下滑的邊緣,早期診斷有助于降低衰弱前期向衰弱轉(zhuǎn)化的風(fēng)險(xiǎn)。從人群分布上看,65歲及以上男性衰弱患病率為 7.1% ,女性高達(dá)23.9%[16] 。Zhou等[7]的Meta分析進(jìn)一步指出,江蘇省和安徽省的衰弱患病率分別為 5.8% 和 12.3% ,農(nóng)村衰弱患病率接近城市的2倍。從各層面來(lái)看,我國(guó)衰弱患病率較高,且存在顯著的年齡、性別和地域差異,老年人健康狀況不容樂(lè)觀,臨床管理面臨較大挑戰(zhàn)。
1.3骨量-肌量減少性肥胖和衰弱流行病學(xué)相關(guān)性
OSA與衰弱共存的一個(gè)重要原因是二者間存在相互影響、相互促進(jìn)的惡性循環(huán)關(guān)系。Frisoli等[8的研究表明,肌少性肥胖(sarcopenicobesity,SO)與身體衰弱存在強(qiáng)相關(guān)性。具體來(lái)說(shuō),骨質(zhì)疏松癥、肌少癥或肌少-骨質(zhì)疏松癥(osteosarcopenia,OS)病人社會(huì)衰弱患病率分別為 11.8%.17.9% 和 29.1%[19] 。OS病人的衰弱患病率約為健康人群的3倍,而OSA病人發(fā)生衰弱的風(fēng)險(xiǎn)更高[20]。在絕經(jīng)后女性中,患有OSA的老年人比單純性肥胖老年人表現(xiàn)出更差的握力、步速和平衡力[21]。在身體成分方面,衰弱的老年人表現(xiàn)出低骨量、肌量和較高的體脂百分比(BFP),發(fā)生肥胖的風(fēng)險(xiǎn)較正常人高出約2倍,而骨質(zhì)疏松癥的發(fā)生風(fēng)險(xiǎn)高出約5倍[22]。劉柯汝等[23]進(jìn)一步指出,60歲及以上社區(qū)老年人中,存在社會(huì)衰弱的老年人發(fā)生OS的風(fēng)險(xiǎn)是正常人的5.7倍。這些數(shù)據(jù)表明OSA與衰弱之間存在密切的相關(guān)性,強(qiáng)調(diào)了綜合管理OSA和衰弱的重要性。
2骨量-肌量減少性肥胖和衰弱的共同危險(xiǎn)因素
2.1衰老
衰老導(dǎo)致機(jī)體器官組織出現(xiàn)退行性變化,是OSA和衰弱的主要危險(xiǎn)因素。數(shù)據(jù)顯示,60歲時(shí)骨量和肌量分別減少 10%~30% 和 30%~40% ,80歲時(shí)脂肪組織可高達(dá) 60%[24] 。與正常人群相比,肥胖老年人發(fā)生OSA的風(fēng)險(xiǎn)增加了2.5倍[25]。衰老引起肌衛(wèi)星細(xì)胞的功能衰退,肌肉修復(fù)和再生能力降低,導(dǎo)致肌肉質(zhì)量和力量下降。此外,女性衰老過(guò)程中雌激素水平下降,引起肌肉痙攣和骨量流失,加速衰弱狀態(tài)。因此,需關(guān)注絕經(jīng)后女性的骨骼肌肉健康問(wèn)題。
2.2低度慢性炎癥(LGCI)和應(yīng)激
低度慢性炎癥作為一種亞臨床炎癥,誘導(dǎo)間充質(zhì)干細(xì)胞譜系轉(zhuǎn)化,激活環(huán)氧合酶2(Cox-2)和5-脂氧合酶(5-Lox)的活性,增加促炎性脂質(zhì)介質(zhì)前列腺素E2(PGE2)和白三烯B4(LTB4)的合成,導(dǎo)致骨質(zhì)疏松癥、肌少癥和肥胖[26]。低度慢性炎癥通過(guò)白介素(IL)-1和腫瘤壞死因子( TNF-α. 介導(dǎo)的炎癥信號(hào)傳導(dǎo)途徑,增加破骨細(xì)胞活性,導(dǎo)致骨質(zhì)疏松。高水平的IL-6、C反應(yīng)蛋白(CRP)和 TNF?α 與老年病人較低的肌肉質(zhì)量有關(guān)。慢性應(yīng)激通過(guò)降低免疫功能,影響機(jī)體營(yíng)養(yǎng)狀態(tài),促進(jìn)OSA的發(fā)展并加速衰弱進(jìn)程[2]。
2.3不良生活方式
高糖高熱量飲食導(dǎo)致?tīng)I(yíng)養(yǎng)過(guò)剩,引起免疫系統(tǒng)紊亂,增加患骨質(zhì)疏松癥、肌少癥和脂肪肝的風(fēng)險(xiǎn)。動(dòng)物實(shí)驗(yàn)證實(shí)了高脂高糖飲食導(dǎo)致小鼠肌肉萎縮、骨量減少及肥胖[28]。薈萃分析結(jié)果顯示,體力活動(dòng)不足是OSA和衰弱的危險(xiǎn)因素[29]。每日靜坐 10~13h 的老年人發(fā)生衰弱的風(fēng)險(xiǎn)是靜坐少于 6h 的3倍[30]。久坐不動(dòng)與較低的肌肉力量有關(guān),并加速脂肪累積。規(guī)避不良生活方式并堅(jiān)持早期適度運(yùn)動(dòng),有助于降低OSA和衰弱的風(fēng)險(xiǎn),提升整體健康水平。
2.4蛋白質(zhì)和維生素D缺乏
充足的營(yíng)養(yǎng)攝入對(duì)老年人的骨骼和肌肉健康至關(guān)重要。然而,老年人由于生理功能衰退和飲食結(jié)構(gòu)變化,易導(dǎo)致?tīng)I(yíng)養(yǎng)攝入不足。據(jù)統(tǒng)計(jì),在養(yǎng)老院中約70% 的女性和 50% 的男性被診斷為OSA,其中近 1/3 存在營(yíng)養(yǎng)不良,在這些人群中, 92.1% 的人存在衰弱[31]。在大于65歲老年男性中,蛋白質(zhì)攝入量低于推薦攝人量 [0.91g/(kg?d)] 的人群發(fā)生OSA的風(fēng)險(xiǎn)是正常攝入量的5.82倍[32]。維生素D缺乏會(huì)導(dǎo)致甲狀旁腺激素(PTH)濃度升高,骨密度(BMD)降低和異位脂肪沉積。維生素D水平與肌少癥和衰弱呈負(fù)相關(guān),患有OSA的女性每日鈣和維生素D攝人不足[33]。韓國(guó)一項(xiàng)健康與營(yíng)養(yǎng)調(diào)查顯示,50歲及以上OSA人群血清維生素D水平較低,膳食炎癥指數(shù)升高[34]。早期評(píng)估和干預(yù)營(yíng)養(yǎng)不良,確保充足的蛋白質(zhì)和維生素D攝入是延緩衰弱的有效策略。
2.5 慢性病
慢性病是一類病因復(fù)雜且病情遷延不愈的疾病。2型糖尿病病人更易引起骨質(zhì)疏松或肌肉減少,有必要對(duì)其進(jìn)行OS評(píng)估,以降低骨折和衰弱的風(fēng)險(xiǎn)。研究顯示,接受激素剝奪療法的乳腺癌和前列腺癌病人發(fā)生肌少癥和衰弱的風(fēng)險(xiǎn)均顯著增加[35]。在40例患類風(fēng)濕關(guān)節(jié)炎女性中OSA患病率為 42.5%[36] ,提示此類病人應(yīng)警惕OSA的發(fā)生。老年人是慢性病的高危人群,建立慢性病隨訪管理有助于改善其身體狀況。
3骨量-肌量減少性肥胖和衰弱發(fā)病機(jī)制的相關(guān)性
3.1 肌肉-骨骼串?dāng)_
肌肉和骨骼間的正向協(xié)同作用是維持身體功能的重要因素,其負(fù)向協(xié)同作用在OSA和衰弱的發(fā)病機(jī)制中扮演關(guān)鍵角色。二者通過(guò)生物力學(xué)、內(nèi)分泌和生長(zhǎng)因子等途徑相互作用,共同影響肌肉和骨骼功能。骨骼肌收縮產(chǎn)生機(jī)械力對(duì)骨施加負(fù)荷,有助于預(yù)防失用性骨量減少,促進(jìn)骨硬化,以為肌肉提供附著點(diǎn)。成骨細(xì)胞分泌的骨鈣素有助于促進(jìn)肌肉合成與分解代謝。胰島素樣生長(zhǎng)因子(IGF-1)促進(jìn)肌肉蛋白質(zhì)合成,刺激成骨細(xì)胞活性,增加BMD。然而,研究證實(shí)骨質(zhì)疏松病人骨保護(hù)素(OPG)/抗因子kB受體活化因子配體(RANKL)/核因子κB受體活化因子(RANK)軸失衡會(huì)影響骨骼肌穩(wěn)態(tài),進(jìn)而增加衰弱的風(fēng)險(xiǎn)[37]。
3.2 肌肉-脂肪串?dāng)_
肌肉和脂肪間多表現(xiàn)為負(fù)向協(xié)同作用。其中肌間脂肪組織(IMAT)和骨骼肌脂質(zhì)沉積(IMCLs是兩個(gè)關(guān)鍵因素。IMAT分布于骨骼肌纖維之間,為肌肉提供營(yíng)養(yǎng)。然而,IMAT過(guò)度累積會(huì)改變肌肉的機(jī)械性質(zhì),使肌肉彈性下降且力量減少 32%~36%[38] 。衰弱老年人的IMAT含量普遍高于正常老年人,可能與IMAT累積導(dǎo)致炎癥因子IL-6釋放、增加衰弱的易感性有關(guān)[39]。IMCLs是沉積在骨骼肌細(xì)胞內(nèi)部的脂肪滴。IMCLs的累積引起快肌纖維向慢肌纖維的轉(zhuǎn)變,并增加活性氧(ROS)的產(chǎn)生,進(jìn)一步削弱肌肉力量。
3.3骨骼-脂肪串?dāng)_
骨骼和脂肪之間既有正向協(xié)同作用,也有負(fù)向協(xié)同作用,取決于具體的生理?xiàng)l件和細(xì)胞信號(hào)途徑。脂肪組織來(lái)源的細(xì)胞外囊泡(Evs在骨骼-脂肪串?dāng)_中發(fā)揮重要作用。Evs中含有脂質(zhì)、蛋白質(zhì)和微小RNA(miRNAs),后者通過(guò)調(diào)控Runt相關(guān)轉(zhuǎn)錄因子2和 Wnt 信號(hào)通路影響骨代謝,miR-335能促進(jìn)成骨細(xì)胞增殖和分化,而miR-155表達(dá)上調(diào)時(shí)促進(jìn)破骨細(xì)胞生成,降低BMD,這種負(fù)向作用會(huì)加速骨量減少,增加衰弱的風(fēng)險(xiǎn)。骨髓脂肪組織(BMAT)產(chǎn)生的脂聯(lián)素與脂聯(lián)素受體1結(jié)合,觸發(fā)p38絲裂原活化蛋白激酶(p38MAPK)磷酸化,增加環(huán)氧合酶-2(Cox-2)和骨形態(tài)發(fā)生蛋白-2(BMP-2)的表達(dá),刺激骨形成[40]。然而,在OSA人群中,這種正向作用可能被負(fù)向調(diào)控所掩蓋,導(dǎo)致骨質(zhì)疏
松癥和衰弱的發(fā)生。
3.4肌肉-骨骼-脂肪串?dāng)_在衰弱中的角色
肌肉-骨骼-脂肪串?dāng)_是維持內(nèi)環(huán)境穩(wěn)定所必需的,在衰弱的發(fā)病機(jī)制中起關(guān)鍵作用。衰弱不僅是單一組織的衰退,而是多系統(tǒng)的全面衰退。在衰弱的過(guò)程中,肌肉萎縮、骨質(zhì)流失和脂肪組織功能異常形成惡性循環(huán)。
研究表明,鳶尾素通過(guò)調(diào)控多條信號(hào)通路,在肌肉-骨骼-脂肪串?dāng)_中起重要作用。在肌細(xì)胞中,鳶尾素誘導(dǎo)過(guò)氧化物酶體增殖物激活受體-γ共激活因子1α(PGC-1α的表達(dá),通過(guò)改善肌肉功能和耐力,延緩肌肉萎縮[41]。在成骨細(xì)胞中,鳶尾素下調(diào)成骨細(xì)胞衰老標(biāo)志物p21的表達(dá),減少骨質(zhì)流失。在脂肪細(xì)胞中,鳶尾素增加解偶聯(lián)蛋白1(UCP1)的表達(dá),誘導(dǎo)白色脂肪“棕色化”,通過(guò)增加能量消耗減少脂肪儲(chǔ)存[42]。而循環(huán)鳶尾素濃度降低時(shí),白色脂肪增多引起脂肪累積,特別是脂肪浸潤(rùn)到肌肉和骨骼組織中,脂肪浸潤(rùn)會(huì)降低線粒體耗氧率(OCR),造成肌肉、骨骼和脂肪細(xì)胞的損傷,這些損傷會(huì)導(dǎo)致骨質(zhì)疏松、肌肉損失和衰弱[43]。
這些發(fā)現(xiàn)為衰弱的綜合治療提供了新思路,強(qiáng)調(diào)了從整體上維護(hù)肌肉、骨骼和脂肪組織健康的重要性。未來(lái)可通過(guò)探索鳶尾素的潛在機(jī)制,為OSA和衰弱提供新的治療靶點(diǎn)。
4骨量-肌量減少性肥胖和衰弱臨床治療的相關(guān)性
4.1營(yíng)養(yǎng)干預(yù)
長(zhǎng)期序貫營(yíng)養(yǎng)干預(yù)是OSA和衰弱的一級(jí)預(yù)防策略。研究證實(shí),營(yíng)養(yǎng)在OS和衰弱之間起中介作用,對(duì)OS病人進(jìn)行早期營(yíng)養(yǎng)評(píng)估和干預(yù)可降低衰弱的風(fēng)險(xiǎn)[44]。維生素D上調(diào)骨骼肌維生素D受體(VDR)水平增強(qiáng)肌肉力量,并促進(jìn)腸道鈣吸收,通過(guò)影響 Wnt/β catenin信號(hào)通路促進(jìn)骨形成。50歲及以上老年人維生素D攝人量應(yīng)在 800~1000IU/d ,維持 肌少癥和衰弱老年人應(yīng)確保每日攝入 1.2~1.5g/kg 優(yōu)質(zhì)蛋白質(zhì)。乳清蛋白作為一種乳源性蛋白質(zhì),含有豐富的亮氨酸,能刺激肌肉蛋白質(zhì)合成。由于肥胖老年人對(duì)蛋白質(zhì)合成的反應(yīng)減弱,建議采用低熱量飲食,同時(shí)補(bǔ)充乳清蛋白、亮氨酸和維生素D,以控制體重并維持肌肉質(zhì)量。地中海飲食作為一種健康的膳食結(jié)構(gòu),以攝人大量新鮮蔬菜水果、豆類、全谷類和魚肉為主,具有抗炎、抗氧化和降血脂的益處。該飲食模式中的肉類以魚肉為主,富含優(yōu)質(zhì)蛋白質(zhì)、維生素D和 ω-3 脂肪酸。通過(guò)魚肉攝入的維生素D達(dá)推薦攝入量的87% ω-3 脂肪酸能提高肌少癥病人肌肉質(zhì)量,減少脂肪量,降低衰弱患病率[45]。研究表明維生素B6可調(diào)節(jié)多個(gè)信號(hào)通路,促進(jìn)肌衛(wèi)星細(xì)胞生成與分化,預(yù)防肌少癥和衰弱[46]。值得注意的是,孕期營(yíng)養(yǎng)不良可導(dǎo)致子代BMD和瘦體重下降[47]。因此,早期營(yíng)養(yǎng)干預(yù)應(yīng)作為OSA的終身防治策略,以降低與衰弱相關(guān)的負(fù)面影響。深人探討不同膳食模式和特定營(yíng)養(yǎng)素的益處并制定階梯式膳食管理策略,以保持老年人的峰值骨量和肌肉量,維持較低體脂率。
4.2運(yùn)動(dòng)干預(yù)
運(yùn)動(dòng)鍛煉是OSA的基礎(chǔ)治療,也是防治衰弱的有效策略。運(yùn)動(dòng)誘導(dǎo)的生物活性細(xì)胞因子通過(guò)肌肉-骨骼-脂肪串?dāng)_,促進(jìn)肌肉合成代謝、骨形成和脂肪酸氧化。系統(tǒng)評(píng)價(jià)顯示,12周抗阻運(yùn)動(dòng)顯著改善OSA病人的Z評(píng)分和體脂百分比(BFP)[48]。Banitalebi等[49]對(duì)患有OSA且體質(zhì)指數(shù)( BMI)≥30kg/m2 的老年人進(jìn)行彈力帶訓(xùn)練,每次 60min,12 周(3次/周)后顯示內(nèi)臟脂肪指數(shù)降低。2022年衰弱和肌少癥國(guó)際會(huì)議臨床實(shí)踐指南建議老年人實(shí)施聯(lián)合漸進(jìn)性抗阻、有氧和韌性訓(xùn)練在內(nèi)的多組分運(yùn)動(dòng)方案[50]。隨著傳統(tǒng)中醫(yī)養(yǎng)生的盛行,八段錦被證實(shí)有助于提高BMD和肌肉質(zhì)量,逆轉(zhuǎn)衰弱前期老年人的身體狀況[51]??赡芘c長(zhǎng)期低強(qiáng)度有氧運(yùn)動(dòng)可以改變衰老過(guò)程中miRNAs的表達(dá)、減少促炎因子的分泌,減弱LGCI有關(guān)。Huang等52的研究表明,太極拳能改善肌少癥和衰弱老年人的平衡能力,降低體脂量并維持BMD。動(dòng)物實(shí)驗(yàn)顯示,二甲雙胍和叔丁基對(duì)苯二酚聯(lián)合有氧運(yùn)動(dòng)能增加雌性O(shè)SA大鼠的肌肉力量,降低BFP[53]。針對(duì)老年人OSA的藥物治療研究較少,仍需更多雙盲隨機(jī)對(duì)照實(shí)驗(yàn)加以驗(yàn)證。綜上所述,由于老年人生理機(jī)能的復(fù)雜性,應(yīng)探索適合的運(yùn)動(dòng)方式、時(shí)間和強(qiáng)度,以確保運(yùn)動(dòng)的安全性和有效性。
5 小結(jié)與展望
綜上,OSA和衰弱是人口老齡化進(jìn)程中面臨的嚴(yán)峻挑戰(zhàn),兩者作為相互影響的多系統(tǒng)疾病,在發(fā)病機(jī)制及臨床治療上具有顯著相關(guān)性。兩者共病嚴(yán)重危害老年人的生存質(zhì)量,臨床工作中應(yīng)整體看待OSA與衰弱,將定期篩查并早期診斷骨質(zhì)疏松癥、肌少癥和肥胖作為衰弱管理的一部分,以減輕老年人的健康負(fù)擔(dān)。
OSA在臨床實(shí)踐中難以及時(shí)識(shí)別,多學(xué)科診療是未來(lái)發(fā)展的趨勢(shì)。目前國(guó)內(nèi)對(duì)OSA和衰弱的相關(guān)性研究不足,且多為橫斷面研究,導(dǎo)致一些危險(xiǎn)因素被遺漏。未來(lái)需進(jìn)一步探索兩者間的共同危險(xiǎn)因素,開(kāi)展更多高質(zhì)量的縱向研究加強(qiáng)對(duì)兩者相關(guān)性的認(rèn)識(shí),為
早期防治提供參考依據(jù)。
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