目的 通过MNA-SF 评估新泾社区老年人营养状况，分析该社区老年人营养状况与肌肉减少症相关性，并观察 营养干预的效果。方法 随机抽取上海新泾社区65 岁以上老年人300 例，通过MNA-SF 将新泾社区老年人群分成营养不 良组、有营养不良风险组以及营养状况正常组，使用BIA 判断他们是否患有肌肉减少症。将营养不良组老年人分为干预组 和对照组，干预组予以 HMB90天进行营养干预。结果 利用 BIA 检测出社区老年男性患者肌肉减少症患病率为 22.6%，老 年女性为12.1%，四肢肌肉组织和身高平方的比值：营养状况正常组（男性为7.6±0.62，女性为6.23±0.15）高于营养不良 风险组（男性为7.15±0.83，女性为5.84±0.26）及营养不良组（男性为6.42±0.54，女性为5.46±0.68），差异有统计学意义。 营养不良组经过基柔（含HMB2.6g/d）干预90 天后，干预组四肢肌肉组织较对照组增加，差异有统计学意义。结论 营养 不良的老年人更容易患肌肉减少症，HMB 补充剂可以增加老年人肌肉含量，有预防肌肉减少的作用。

Objective To evaluate the nutritional status of Shanghai Xinjing community old people with MNA-SF, to analyze the relationship between nutritional status and sarcopenia, and to observe the effect of nutritional intervention. Methods 300 old people aged 65 or older were randomly selected from the community and to were divided into three groups based on the scores of MNA-SF: normal nutritional status group, risk of malnutrition group and malnutrition group. BIA was used to determine whether patients were with sarcopenia in all three groups. Malnutrition group was divided into interventional group and control group, interventional group implemented HMB for 90 days nutritional intervention. Results The prevalence rate of sarcopenia in male and female communitydwelling elders was 22.6% and 12.1% by using BIA respectively. The appendicular skeletal muscle to height squared ratio in normal nutritional status group (7.6±0.62 in males and 6.23±0.15 in females) was higher than those at risk of malnutrition group (7.15±0.83 in males and 5.84±0.26 in females) and the malnutrition group (6.42±0.54 in males and 5.46±0.68 in females). All differences were statistically significant (P<0.05). After intake of JiRou (HMB supplementation was 2.6g/d) intervention for 90 days in malnutrition people, appendicular skeletal muscle in intervention group was statistically increased than control group (P<0.05). Conclusions People with malnutrition were more likely to suffered from sarcopenia. HMB supplementation had shown its increase effect on appendicular skeletal muscle and could attenuated muscle wasting in elderly people.