Effects of 1-year weight loss intervention on abdominal skeletal muscle mass in Japanese overweight men and women

Noriko I. Tanaka*, Haruka Murakami, Naomi Aiba, Akemi Morita, Shaw Watanabe, Motohiko Miyachi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Background and Objectives: Limited information is available on how weight loss intervention programs affect skeletal muscle mass especially in trunk. Methods and Study Design: A total of 235 overweight Japanese men and women aged 40-64 years with a body mass index of 28.0 to 44.8 kg/m2 participated in this randomized controlled intervention study. They were randomly divided into a lifestyle intervention group and control group. Before and after the one-year lifestyle intervention for weight loss an abdominal transverse image was acquired by computed tomography. The cross-sectional areas (CSAs) of visceral fat, subcutaneous fat, and skeletal muscle of rectus abdominis, abdominal oblique, iliopsoas, and erector spinae muscle were calculated. Results: The body weight changed by approximately -5% in the intervention groups. The corresponding values for subcutaneous fat and visceral fat CSAs were -10.8 to -17.5% in both sexes. The reductions observed in skeletal muscle CSAs were significantly less (-6.0% and -7.2% in the men and women intervention groups respectively) than those in fat tissue CSAs. The CSA of each of the four skeletal muscle groups also significantly decreased; however, after adjustments for body weight at each time point, only reductions in the iliopsoas muscle in both sex and abdominal oblique muscles in men remained significant. Conclusions: The lifestyle weight loss intervention might reduce the relative amount of the abdominal skeletal muscles especially in iliopsoas muscle.

Original languageEnglish
Pages (from-to)72-78
Number of pages7
JournalAsia Pacific journal of clinical nutrition
Issue number1
Publication statusPublished - 2019
Externally publishedYes


  • Japanese
  • life style intervention
  • middle-aged
  • muscle distribution
  • visceral fat
  • weight loss

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics


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