Abstract
Background and Objectives. Skeletal muscle and skeletal muscle indices in young adults from developing countries are sparse. Indices and the corresponding cut-off points can be a reference for diagnoses of sarcopenia. This study assessed skeletal muscle using dual-energy X-ray absorptiometry (DXA) in healthy male and female subjects aged 20–40 years and compared their appendicular skeletal muscle mass (ASM) and total-body skeletal muscle (TBSM) indices using certain cut-off points published in the literature. Methods. A sample of 216 healthy adults men and women from northwest Mexico was included. Body composition was assessed by DXA and several published DXA-derived skeletal muscle indices were compared. Results. Both, ASM and TBSM were higher in men compared to the women group (23.0 ± 3.4 versus 15.9 ± 1.6 kg; P < 0.05 and 26.5 ± 4.1 versus 16.9 ± 1.9 kg; P < 0.05, resp.). These differences were also valid for both indices. When derived cut-off points were compared with the most reported indices, significant differences were found. Interpretation and Conclusion. Published cut-off points from Caucasians are higher than cut-off point derived in this sample of Mexican subjects. The new DXA-derived cut-off points for ASM proposed herein may improve diagnoses of sarcopenia in the geriatric Mexican population.
Highlights
Skeletal muscle (SM) plays a central role in many biological functions, such as movement and metabolism, so disruptions in this component of body composition can have a marketed influence on health and disease [1]
appendicular skeletal muscle mass (ASM) and total-body skeletal muscle (TBSM) were higher in men compared to the mean value for the women’s group
The indices derived from some Caucasian populations are higher (i.e., Baumgarnert et al.’s cut-off points of 7.26 and 5.45 for young man and women adults, resp., [6]) because, in general, Caucasian people are taller than Latina American or Asian populations, while in the case of the African-American people we find significantly greater skeletal muscle mass [20] and it has been reported longer appendicular bone lengths [22, 23] compared to Caucasian subjects
Summary
Skeletal muscle (SM) plays a central role in many biological functions, such as movement and metabolism, so disruptions in this component of body composition can have a marketed influence on health and disease [1]. We cannot ignore the influence of this factor on nutritional status and functionality at older ages Skeletal muscle in both men and women subjects remains relatively constant during the third and fourth decades of life but begins to decline noticeably at ∼45 years of age [2,3,4]. This study assessed skeletal muscle using dual-energy X-ray absorptiometry (DXA) in healthy male and female subjects aged 20–40 years and compared their appendicular skeletal muscle mass (ASM) and total-body skeletal muscle (TBSM) indices using certain cut-off points published in the literature. ASM and TBSM were higher in men compared to the women group (23.0 ± 3.4 versus 15.9 ± 1.6 kg; P < 0.05 and 26.5 ± 4.1 versus 16.9 ± 1.9 kg; P < 0.05, resp.) These differences were valid for both indices. The new DXA-derived cut-off points for ASM proposed may improve diagnoses of sarcopenia in the geriatric Mexican population
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