Daily Dietary Supplementation with Steamed Soybean Improves Muscle Volume and Strength in Healthy People Lacking Exercise

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  • KOHNO Madoka
    Department of Nutritional Physiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • ULLA Anayt
    Department of Nutritional Physiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • TANIGUCHI Rina
    Department of Nutritional Physiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • OHISHI Akane
    Department of Diagnostic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • HIRAYAMA Kako
    Department of Diagnostic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • TAKEMURA Yuma
    Department of Diagnostic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • TAKAO Shoichiro
    Department of Diagnostic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • KANAZAWA Yuki
    Department of Diagnostic Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • MATSUMOTO Yuki
    Department of Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • HARADA Masafumi
    Department of Radiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • FUKAWA Tomoya
    Department of Urology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • KANAYAMA Hiro-omi
    Department of Urology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • UCHIDA Takayuki
    Department of Nutritional Physiology, Institute of Biomedical Sciences, Tokushima University Graduate School
  • SUZUKI Toshio
    Innovation Center for R&D Laboratories, Fujicco Co., Ltd.
  • NIKAWA Takeshi
    Department of Nutritional Physiology, Institute of Biomedical Sciences, Tokushima University Graduate School

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<p>Various dietary protein supplements are used by the elderly and bedridden to maintain their skeletal muscle mass and functions. High-quality proteins act as an anabolic driver and help to improve muscle strength and performance. Previously, we reported that soy protein significantly attenuates denervation-induced loss of muscle mass and myofiber cross sectional area in mice with inhibition of ubiquitination and degradation of IRS-1 in tibialis anterior muscle. It also increased muscle volume and strength in bedridden patients. In the present study, we investigated the effects of dietary soybean supplementation on muscle functions in taxi drivers lacking vigorous physical exercise. We conducted a case-control study on 25 healthy, male taxi drivers between the ages of 36 and 71 y performing minimal physical exercise. They were divided into two dietary groups: the soybean diet group (n=13) who ate daily meals (dinner) supplemented with 50 g of steamed soybean for 30 d and the control diet group (n=12) who received no soybean supplement. Next, we measured the muscle cross-sectional area (CSA) and muscle strength and function in both the groups before and after 30 d of soybean intake. The body weights of both diet groups did not differ significantly over time. However, after 30 d of soybean supplementation, the soybean-fed group developed significantly higher muscle CSA and grip strength compared to the control groups. In conclusion, dietary soybean supplementation improved muscle function in taxi drivers who lacked exercise.</p>

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