研究背景：我國主力戰鬥機種 (F-16、M-2000、IDF) 可達每秒6G加速度到9G過載能力，而暴露在G力的環境下，血液重量變重且囤積在飛行員下半身，會使得腦血壓降低，嚴重時可能導致人員昏迷 (G-force induced loss of consciousness, G-LOC)，造成飛行員生理負荷及飛安危害。有鑒於此，本研究透過蒐集身高（心腦間垂直距離）與體脂肪率、BMI、體重等重要身體組成與生理指標，以進一步地探討其與G耐受力的關聯性，以做為未來實務應用的參考基礎。
研究目的：以空軍官校基本組學生為研究對象，探討身體與生理表現指標對G耐受力之影響。
研究方法：本研究招募符合入學標準之168位員空軍官校學官為參與者，平均年齡為25.47 ± 1.77歲。在完成學科課程之後，測量其身高、體重、身體質量指數 (body mass index, BMI)、體脂肪率、肌肉量等身體條件及生理指標，並於休息後進行離心機訓練，在訓練時分別記錄鬆弛G耐受力及緊張G耐受力。數據結果以描述性統計、皮爾森相關、階層迴歸模型進行資料分析與呈現。
研究結果：在皮爾森相關分析結果發現，緊張G耐受力、BMI、體脂肪率、下肢肌肉量和鬆弛G耐受力有顯著正相關；身高和鬆弛Ｇ耐受力有顯著負相關。另一方面，BMI、體脂肪率、下肢肌肉量和緊張G耐受力有顯著正相關；身高和緊張Ｇ耐受力有顯著負相關。而在階層回歸模型中，分析結果發現僅有身高與下肢肌肉量與鬆弛G耐受力有顯著相關；緊張G耐受力方面僅有身高有顯著相關。
研究結論：本研究透過一系列的資料蒐集與分析後發現，身體條件及生理指標確實與人體的高G耐受力有明顯關聯，並且主要發現身高、下肢肌肉量對鬆弛G耐受力的影響力較大，而在緊張G耐受力中，則僅有身高的影響較為顯著。研究結果也可作為未來空軍官校甄選飛行學生及線上飛行員訓練時的參考依據。

The study discusses the impact of body composition and physiological indexes on G-tolerance, and take students of Air Force Academy basic section as object. Due to Taiwan’s main fighter aircraft, such as F-16、M-2000、IDF, could accelerate from +6 Gz to +9Gz per second. Being G exposure lead to blood hoarding in lower body and lower cerebral blood pressure which could result in G-LOC (G-force induced loss of consciousness). This might cause pilots’ body burden and damage fly safety. The study takes 168 Air Force Academy students as objects, whose age are 25.47 ± 1.77 years old. After finishing academic subject course, students are measured in height, weight, BMI, PBF and other body conditions or physiological indexes. With Pearson correlation coefficients, strained G tolerance, BMI, PBF, muscle mass of lower body have significant correlation with relaxed G tolerance; height and relaxed G tolerance are significantly negative correlation. The study found that body composition and physiological indexes have significant correlation with high G tolerance, and height, muscle mass of lower body have greater effect on relaxed G tolerance.

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