Maya Hioki1, Hiroko Takahashi2, Akira Saito3, Mizuka Imai4, Hideki Yasuda5. 1. Faculty of Health Care and Medical Sports, Department of Rehabilitation, Teikyo Heisei University, 4-1 Uruido Minami, Ichihara, Chiba, 290-0193, Japan. maya@mri.biglobe.ne.jp. 2. Faculty of Health and Medical Science, Department of Health and Dietetics, Teikyo Heisei University, 2-51-4 HigashiIkebukuro, Toshima-ku, Tokyo, 170-8445, Japan. 3. Center for Health and Sports Science, Kyushu Sangyo University, 2-3-1 Matsukadai, Higashi-Ku, Fukuoka, Fukuoka, 813-8503, Japan. 4. Uruido Minami Medical Clinic, 2-1-3 Uruido Minami, Ichihara, Chiba, 290-0170, Japan. 5. Faculty of Health Care and Medical Sports, Department of Judo Physical Therapy, Teikyo Heisei University, 4-1 Uruido Minami, Ichihara, Chiba, 290-0193, Japan.
Abstract
PURPOSE: Electromyostimulation (EMS) induces a short-term change in muscle metabolism, and EMS training induces long-term improvements of muscle atrophy and function. However, the effects of EMS training on intramuscular fat in older adults are still poorly known. The purpose of this study was to examine whether the intramuscular fat index and biochemical parameters change with EMS training of the quadriceps femoris muscles in older adults. METHODS: Nineteen non-obese older men and women performed EMS training of the quadriceps femoris for 12 weeks (3 times/week; single session for 30 min). The intramuscular fat content index was estimated by echo intensity of the vastus lateralis and rectus femoris muscles on ultrasonography, and muscle thickness was also measured. Muscle strength was assessed as the maximal voluntary contraction during isometric knee extension. Echo intensity, muscle thickness, and muscle strength were measured before and after EMS training. A rested/fasting blood samples were collected before and after EMS training for measuring plasma glucose, insulin, free fatty acid, triglyceride, and interleukin-6 concentrations. To examine the acute effect of a single-EMS session on biochemical parameters, blood samples were taken before and after the EMS session. RESULTS: EMS training did not significantly change echo intensity in muscles, muscle thickness, muscle strength, or biochemical parameters. Regarding the acute effect on blood lipid concentrations, a single-EMS session increased free fatty acid and glucose concentrations. CONCLUSION: EMS sessions had an acute effect of increasing free fatty acid and glucose concentrations, but EMS training intervention did not improve intramuscular fat content.
PURPOSE: Electromyostimulation (EMS) induces a short-term change in muscle metabolism, and EMS training induces long-term improvements of muscle atrophy and function. However, the effects of EMS training on intramuscular fat in older adults are still poorly known. The purpose of this study was to examine whether the intramuscular fat index and biochemical parameters change with EMS training of the quadriceps femoris muscles in older adults. METHODS: Nineteen non-obese older men and women performed EMS training of the quadriceps femoris for 12 weeks (3 times/week; single session for 30 min). The intramuscular fat content index was estimated by echo intensity of the vastus lateralis and rectus femoris muscles on ultrasonography, and muscle thickness was also measured. Muscle strength was assessed as the maximal voluntary contraction during isometric knee extension. Echo intensity, muscle thickness, and muscle strength were measured before and after EMS training. A rested/fasting blood samples were collected before and after EMS training for measuring plasma glucose, insulin, free fatty acid, triglyceride, and interleukin-6 concentrations. To examine the acute effect of a single-EMS session on biochemical parameters, blood samples were taken before and after the EMS session. RESULTS: EMS training did not significantly change echo intensity in muscles, muscle thickness, muscle strength, or biochemical parameters. Regarding the acute effect on blood lipid concentrations, a single-EMS session increased free fatty acid and glucose concentrations. CONCLUSION: EMS sessions had an acute effect of increasing free fatty acid and glucose concentrations, but EMS training intervention did not improve intramuscular fat content.
Authors: Margarita Pérez; A Lucia; J-l L Rivero; A L Serrano; J-A L Calbet; M A Delgado; J L Chicharro Journal: Pflugers Arch Date: 2002-01-22 Impact factor: 3.657
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