坐直仍腰痠背痛 醫揭1關鍵:完美姿勢不存在
The horn antenna has a distinctive design that is enlarged towards the end. Horn antennas typically feature a directional radiation pattern with a high antenna gain of 10-20 dBi, some antennas have a higher gain such as the standard horn antenna up to 25 dBi. Horn antennas feature a low VSWR and a wide impedance bandwidth.
Double Ridged Horn Antennas are very popular from 200 MHz frequency to higher frequencies up to 40GHz. We have recently extended the usage frequency of this antenna up to 60 GHz.
This antenna's operating frequency has recently been increased to 60 GHz. The research process for the product line is still ongoing but is planned to be completed this year. To receive the most recent price and technical information on the new product, please contact us for more information.
Double Ridged Horn Antennas are suitable for both transmitting and receiving purposes, with applications:
- - Antenna measurement
- - Communication systems
- - Satellite tracking systems
- - Radar Detection System
- - Surveillance System
- - Electromagnetic Compatibility Testing (EMC test)
Recommended Accessories
- - Antenna Tripod: easy and fast-changing position. 100% stable after installing.
- - SMA Cable: High-quality special SMA cable
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很多人認為不良坐姿如駝背會導致背痛,然而,復健科醫師王思恒引述研究指出,脊柱曲線與背痛之間的關聯性很弱,甚至可能不存在。他強調,其實並不存在一種絕對正確的「完美坐姿」,關鍵在於不要維持同一姿勢太久,每隔一段時間改變姿勢或站起來活動,才是預防和緩解背痛的有效方式。
醫師王思恒在個人粉專發文表示,根據2008年所發表的一項系統性文獻回顧,研究人員檢視了54篇有關脊椎曲線與健康的研究,結果顯示,脊柱曲線與背痛之間的關聯性很弱,甚至可能不存在。此意味著,不論是腰桿挺得再直,還是偶爾有點駝背,對於是否會腰痠背痛,影響可能沒有想像中那麼大。
王思恒進一步分享2個診間案例,其一是一名30歲的男性患者,看診時坐得直挺,原來是因為他看了網路文章,相信駝背會導致椎間盤突出,因此時刻都很注意坐姿,但這樣做並沒有緩解其背痛。另一則是一位10歲的弟弟,被父母帶來看駝背,雖然確實駝背得嚴重,整個人看起來沒有精神,但一問之下,未曾有任何痠痛的困擾。
本文引用自: https://www.chinatimes.com/realtimenews/20250208002162-260418
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