大綱
在現代生活中,坐在辦公桌前、盯著電腦螢幕,是許多人每天的日常。然而,長時間的坐姿其實會對脊椎造成不小的負擔。發表於 Journal of Bodywork & Movement Therapies 的一篇系統性回顧,探討了「坐姿」對腰椎椎間盤高度與退變的影響。
文獻設計與研究方法
系統性回顧的來源
這篇研究依循 PRISMA 指引進行,並在 OSF 登錄。研究者利用 PECOS 架構設定問題焦點:
- P(Population):男性或女性
- E(Exposure):坐姿
- C(Comparison):其他姿勢或不同時間的坐姿
- O(Outcome):椎間盤高度或退變(影像學評估)
- S(Study type):橫斷研究、病例對照研究
納入與排除條件
研究者檢索了 PubMed、Scopus、Embase、Cochrane、PEDro,以及灰色文獻(Google Scholar、CAPES、OpenGrey)。最後從 1108 筆紀錄中,篩選出 4 篇研究,樣本總數 699 人。排除了曾接受脊椎手術、合併風濕疾病的受試者。
主要研究發現
坐姿會讓椎間盤高度下降
在四篇研究中,有三篇一致指出 坐姿會導致椎間盤高度下降:
- Billy et al. (2014):連續坐四小時後,L4–L5 高度明顯下降;但如果每 15 分鐘做短暫伸展,椎間盤高度就能維持穩定。
- Alamin et al. (2018):比較不同坐姿,發現「無靠背凳子坐」的椎間盤高度最低,而站姿最高。
- Takatalo et al. (2010):指出過重、抽菸、久坐等生活習慣,與年輕男性椎間盤退變有關。
坐姿與椎間盤退變的差異
- Schenk et al. (2006):比較護理人員與行政人員,結果顯示兩組在椎間盤退變上差異不大。作者推測,樣本多為 50 歲以上,椎間盤本來就容易出現早期退變,因此差異不明顯。
討論
久坐是危險因子
整體而言,這篇回顧指出 久坐確實會造成椎間盤高度下降,而坐姿不佳(無支撐)、體重過重或生活習慣不良,更會加劇退變風險。
研究的限制
納入的研究數量有限,樣本也偏少,大多為橫斷設計,因此因果關係仍需更嚴謹的追蹤研究來確認。
點評
- 久坐會影響椎間盤高度,但每15分鐘起身動一動,就能改善這種狀況。
- 不要坐太矮的椅子,建議使用有靠背椅子。
- 生活方式(體重、抽菸、久坐)會加速退變。
參考文獻 Zanola RL, Donin CB, Bertolini GRF, Buzanello Azevedo MR. Biomechanical repercussion of sitting posture on lumbar intervertebral discs: A systematic review. J Bodyw Mov Ther. 2024 Apr;38:384-390. doi: 10.1016/j.jbmt.2024.01.018. Epub 2024 Feb 10. PMID: 38763583.
Sitting Posture and Lumbar Discs: What Science Reveals
Prolonged sitting is part of modern life, but research shows it may harm your spine. A 2024 systematic review in the Journal of Bodywork & Movement Therapies examined how sitting posture affects lumbar intervertebral discs.
Study Design
Researchers followed PRISMA guidelines and reviewed four observational studies with 699 participants. Imaging tools like MRI and X-ray were used to measure disc height and degeneration.
Key Findings
- Sitting for long hours reduces disc height, especially at the L4–L5 level. One study found four hours of uninterrupted sitting caused significant disc shrinkage, while short breaks every 15 minutes prevented these changes.
- Chair design matters: sitting on a stool without support produced the lowest disc height, while supported sitting or standing preserved spinal health better.
- Lifestyle factors such as obesity, smoking, and prolonged sitting were linked to early disc degeneration in young men.
Discussion
Overall, the review concluded that sitting posture leads to decreased lumbar disc height. However, more rigorous studies with larger samples are needed. The evidence suggests that changing posture regularly, using supportive chairs, and maintaining healthy habits can protect spinal health.
Takeaway
Avoid prolonged sitting, choose ergonomic chairs, and keep active. Even small breaks can help maintain lumbar disc health and reduce long-term back problems.