The influence of knee varus and valgus on quadriceps muscle activity changes induced by stretching and kneeling |
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| Institution: | 1. Department of Orthopedic Surgery, Akita Hospital, 2–6-12 Takara, Chiryu City, Aichi 472–0056, Japan;2. Department of Rehabilitation, Akita Hospital, Chiryu, Japan;3. Department of Rehabilitation and Care, Seijoh University, 2–172 Fukinodai, Tokai City, Aichi 476–8588, Japan;1. INRIA, Montpellier University, Montpellier, France;2. Neurinnov, Montpellier, France;1. Department of Integrative Physiology, University of Colorado Boulder, USA;2. Department of Applied Physiology & Kinesiology, University of Florida, USA;1. J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, USA;2. Department of Physical Therapy, University of Florida, Gainesville, USA;3. Department of Orthopaedic Surgery & Sports Medicine, University of Florida, Gainesville, USA;4. Department of Anesthesiology, University of Florida, Gainesville, USA;1. Department of Rehabilitation, Himeji Central Hospital, 2-36, Shikama-ku Miyake, Himeji City, Hyogo 672-8501, Japan;2. Department of Rehabilitation, National Hospital Organization Wakayama Hospital (Current Address), 1138 Wada Mihama-cho, Hidaka-gun, Wakayama 644-0044, Japan;3. Faculty of Rehabilitation, Kansai Medical University, 18-89 Uyamahigashicho, Hirakata City, Osaka 573-1136, Japan;4. Avanzar Co., Ltd, 506-1 Higasifutami, Futami-town, Akashi City, Hyogo 674-0092, Japan;5. Department of Rehabilitation, Itami Kousei Neurosurgical Hospital, 1-300-1, Nishino, Itami City, Hyogo, Japan;6. EveRehab, Inc, 46 Kamitakanonakamachi, Sakyo-ku, Kyoto City, Kyoto 606-0044, Japan;7. Department of Rehabilitation, Saiseikai Hyogo Hospital, 5-1-1 Fujiwaradainakamachi, Kita-ku, Kobe City, Hyogo 651-1302, Japan |
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| Abstract: | This study aimed to determine the influence of knee varus (VARUS) and valgus (VALGUS) on the differences in individual quadriceps muscle (QM) activity during knee extension maximum voluntary isometric contractions (MVICs) and sit/stand transitions and on the changes in individual QM activity during sit/stand transitions after QM stretching and kneeling. Ten young healthy males each with VARUS and VALGUS were included. The electromyography signals of the vastus medialis (VM), vastus lateralis, and rectus femoris were recorded during sit/stand transitions before and after rest, stretching, and kneeling and during knee extension MVICs after rest. The individual muscle-to-total muscle activity ratio was assessed. The VARUS group exhibited a significantly higher VM muscle activity ratio in the sit-to-stand and stand-to-sit tasks than in knee extension MVICs (p = 0.004 and p = 0.044, respectively) and a tendency that the VM muscle activity ratio increased in the sit-to-stand task after stretching (p = 0.051), whereas the VALGUS group exhibited no significance. Individuals with VARUS required high VM muscle activity ratios during sit/stand transitions. Future studies should be conducted to determine whether habitual sit-to-stand exercises after QM stretching are effective in preventing knee medial osteoarthritis development in individuals with VARUS. |
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| Keywords: | Quadriceps muscles Knee alignment Stretches Kneeling Vastus medialis |
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