Naoki Akazawa, Assistant Professor, Department of Physical Therapy, Faculty of Health and Welfare, Tokushima Bunri University, Hoji 180, Nishihama, Yamashiro-cho, Tokushima-city, Tokushima 770-8514, Japan, Tel +81 88 602 8000, Fax +81 88 602 8146, Email
J Nutr Health Aging. 2022;26(5):495-500. doi: 10.1007/s12603-022-1785-9.
This study aimed to examine the relationship between muscle mass, intramuscular adipose tissue, and body mass index (BMI) in older inpatients.
Cross-sectional study.
Hospital-based study.
This study included 413 inpatients aged ≥ 65 years (186 men and 227 women).
Muscle mass and intramuscular adipose tissue of the quadriceps were assessed by measuring the muscle thickness and echo intensity on ultrasound images. To examine the relationship between quadriceps thickness and echo intensity and BMI in total participants and each sex, the Kendall rank correlation coefficient was used. Multiple regression analysis was performed to examine whether BMI was independently and significantly related to the quadriceps thickness and echo intensity, even after adjusting for other variables for total participants and each sex. The independent variables in multiple regression analyses were BMI, age, disease, days from onset disease.
The results of the correlation analyses showed that BMI was significantly related to the quadriceps thickness (total participants, τ = 0.431; men, τ = 0.491; women, τ = 0.388) and echo intensity (total participants, τ = -0.239; men, τ = -0.318; women, τ = -0.188). In the multiple regression analysis, BMI was independently and significantly associated with the quadriceps thickness (total participants, β = 0.535; men, β = 0.548; women, β = 0.519) and echo intensity (total participants, β = -0.287; men, β = -0.398; women, β = -0.210).
This study indicated that older inpatients with a higher BMI have greater muscle mass and less intramuscular adipose tissue of the quadriceps. These results suggested that a higher BMI in older inpatients is related to higher quadriceps muscle quality.
本研究旨在探讨老年住院患者肌肉量、肌内脂肪量与体重指数（BMI）之间的关系。
横断面研究。
医院为基础的研究。
本研究纳入了 413 名年龄≥65 岁的住院患者（男性 186 名，女性 227 名）。
通过超声图像测量股四头肌的肌肉厚度和回声强度来评估肌肉量和肌内脂肪量。为了研究股四头肌厚度和回声强度与 BMI 之间的关系，我们在总人群和各性别中使用 Kendall 秩相关系数进行了分析。多元回归分析用于检验 BMI 是否与股四头肌厚度和回声强度独立相关，即使在调整了总人群和各性别中其他变量后。多元回归分析中的自变量为 BMI、年龄、疾病、发病天数。
相关性分析的结果表明，BMI 与股四头肌厚度（总人群，τ=0.431；男性，τ=0.491；女性，τ=0.388）和回声强度（总人群，τ=-0.239；男性，τ=-0.318；女性，τ=-0.188）显著相关。在多元回归分析中，BMI 与股四头肌厚度（总人群，β=0.535；男性，β=0.548；女性，β=0.519）和回声强度（总人群，β=-0.287；男性，β=-0.398；女性，β=-0.210）独立相关。
本研究表明，BMI 较高的老年住院患者股四头肌的肌肉量较大，肌内脂肪量较少。这些结果提示，老年住院患者 BMI 较高与股四头肌肌肉质量较高有关。
