Objective To explore the age related decline in spine muscle volume and fat content in healthy elderly males . Methods Totally 88 males aged 50-79 years were selected from the patients who underwent quantitative CT (QCT) exam of lum‐bar spine .They were subgrouped by 50- <60 years ,60- <70 years and 70-79 years .The muscle fat area ,skeletal muscular area , muscle fat infiltration (MFI) ,abdominal visceral fat volume and subcutaneous fat volume ,abdominal total fat volume were measured by the QCT software .Statistical analysis was performed using intraclass correlation coefficient ,ANOVA with post hoc Bonferroni correction ,Pearson correlation analysis and multiple regression analysis .Results Compared to other two groups ,subjects in 70-79 years subgroup had highest muscle fat area/MFI and least skeletal muscular mass(P<0 .05) .Age‐dependent correlation was found in muscle fat mass(r=0 .381 ,P<0 .05) and MFI(r=0 .358 ,P=0 .001) ,but no obvious correlation was found between age and skeletal muscular mass .Age was the only factor entered into the all three paravertebral muscle composition regression equations , meaning age may had an important influence on paravertebral muscle degeneration .Conclusion Lumbar paravertebral muscle de‐generation in elderly men is correlated with the aging and MFI ,which may play a important role in the normative age‐related decline of skeletal muscle .%目的：研究健康中老年男性椎后肌群的脂肪浸润及肌肉含量与腹内脂肪及年龄的相关关系。方法使用定量CT （QCT）检测88名50～79岁健康男性L3腰椎中部层面椎后肌群的脂肪面积、肌肉面积、肌肉脂肪浸润（MFI）比例情况及腹部多层面内脏脂肪面积、皮下脂肪面积、总脂肪面积，并计算出腹部总内脏脂肪含量、腹部总皮下脂肪含量和腹部总脂肪含量。统计学处理应用组内相关系数、方差分析及Bonferroni分析、Pearson相关分析和多元逐步回归分析。结果高龄组（70～79岁）的M FI和肌量变化的程度明显高于另两组（ P＜0．05）。椎后肌群的脂肪面积及M FI程度与年龄有弱相关性（其中脂肪面积：r＝0．381， P＜0．05；M FI：r＝0．358，P＝0．001），但肌肉含量的改变与年龄没有显著相关性。年龄是唯一进入全部椎后肌群体质成分的回归方程的影响因素。结论在健康中老年男性人群中，年龄增长是影响椎后肌群退变进程的重要因素，而椎后肌群的M FI程度与衰老导致的骨骼肌退变密切相关。
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