Berger Juan, Bunout Daniel, Barrera Gladys, de la Maza María Pía, Henriquez Sandra, Leiva Laura, Hirsch Sandra
Institute of Nutrition and Food Technology, University of Chile, Chile.
Institute of Nutrition and Food Technology, University of Chile, Chile.
Arch Gerontol Geriatr. 2015 Jul-Aug;61(1):33-8. doi: 10.1016/j.archger.2015.03.006. Epub 2015 Apr 1.
Simple and reliable methods to evaluate muscle mass in older people are lacking.
To evaluate ultrasound as a measure of RF muscle mass and quality in healthy subjects of different ages and gender, assessing its concordance with dual energy X-ray densitometry (DEXA) and association with muscle strength and walking capacity.
We selected 54 adults of both genders, aged 20-55 years and 51 adults older than 60 years. Ultrasound images of the RF were obtained at the mid-thigh to measure its thickness and ultrasonographic density using a GE Logiq e equipment. Body composition was assessed by DEXA. Quadriceps isometric strength and 12 minutes' walk were also measured and gender specific t scores for older adults were calculated using the values obtained in adults.
RF ultrasound measurements correlated significantly with lean body mass assessed by DEXA (Double energy X-ray absorptiometry). The concordance between both measures was also adequate. Older people had lower muscle mass and worse ultrasound parameters than adults. Older males with a t score for quadriceps strength of -2 or less, had a significantly higher RF grayscale density. Older males with a 12 minutes' walk t score of -2 or less and old males and females with a walking speed of 1m/s or less had a lower RF thickness.
There is a good concordance between RF ultrasound and DEXA.
Assessment of RF using ultrasound appears to be a reliable and accurate method to evaluate muscle mass in older people.
缺乏评估老年人肌肉量的简单可靠方法。
评估超声作为不同年龄和性别的健康受试者股直肌肌肉量和质量的一种测量方法，评估其与双能X线吸收法（DEXA）的一致性以及与肌肉力量和步行能力的相关性。
我们选取了54名年龄在20 - 55岁的成年男女以及51名60岁以上的成年人。使用GE Logiq e设备在大腿中部获取股直肌的超声图像，以测量其厚度和超声密度。通过DEXA评估身体成分。还测量了股四头肌等长力量和12分钟步行距离，并使用在成年人中获得的值计算老年人的性别特异性t分数。
股直肌超声测量值与通过双能X线吸收法评估的瘦体重显著相关。两种测量方法之间的一致性也较好。老年人的肌肉量低于成年人，超声参数也更差。股四头肌力量t分数为 -2或更低的老年男性，其股直肌灰度密度显著更高。12分钟步行t分数为 -2或更低的老年男性以及步行速度为1m/s或更低的老年男性和女性，其股直肌厚度更低。
股直肌超声与DEXA之间具有良好的一致性。
使用超声评估股直肌似乎是评估老年人肌肉量的一种可靠且准确的方法。
