Masatoshi Nakamura1,2, Ryosuke Kiyono1, Shigeru Sato1, Kaoru Yahata1, Taizan Fukaya1,3, Satoru Nishishita4,5, Andreas Konrad6. 1. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata 950-3198, Japan. 2. Department of Physical Therapy, Niigata University of Health and Welfare, Niigata 950-3198, Japan. 3. Department of Rehabilitation, Kyoto Kujo Hospital, Kyoto 601-8453, Japan. 4. Institute of Rehabilitation Science, Tokuyukai Medical Corporation, Osaka 560-0054, Japan. 5. Kansai Rehabilitation Hospital, Tokuyukai Medical Corporation, Osaka 560-0054, Japan. 6. Institute of Human Movement Science, Sport and Health, University of Graz, Graz A-8010, Austria.
Abstract
BACKGROUND: Previous studies suggest that the capacity for rapid force production of ankle plantar flexors is essential for the prevention of falls in the elderly. In healthy young adults, there were significant associations between rate of force development and muscle stiffness measured by shear wave elastography. However, there has been no study investigating the association of rate of force development with shear elastic modulus in older adults. METHODS: The muscle strength and shear elastic modulus of the medial gastrocnemius muscle in both legs were measured in 17 elderly men and 10 elderly women (mean ± SD; 70.7 ± 4.1 years; 160.6 ± 8.0 cm; 58.7 ± 9.5 kg). We investigated the rate of force development of plantar flexors and shear elastic modulus of medial gastrocnemius muscle using by shear wave elastography. RESULTS: Our results showed that there were no significant associations between normalized rate of force development and shear elastic modulus of medial gastrocnemius muscle. CONCLUSION: This suggests that the capacity of rapid force production could be related not to muscle stiffness of the medial gastrocnemius muscle, but to neuromuscular function in older individuals.
BACKGROUND: Previous studies suggest that the capacity for rapid force production of ankle plantar flexors is essential for the prevention of falls in the elderly. In healthy young adults, there were significant associations between rate of force development and muscle stiffness measured by shear wave elastography. However, there has been no study investigating the association of rate of force development with shear elastic modulus in older adults. METHODS: The muscle strength and shear elastic modulus of the medial gastrocnemius muscle in both legs were measured in 17 elderly men and 10 elderly women (mean ± SD; 70.7 ± 4.1 years; 160.6 ± 8.0 cm; 58.7 ± 9.5 kg). We investigated the rate of force development of plantar flexors and shear elastic modulus of medial gastrocnemius muscle using by shear wave elastography. RESULTS: Our results showed that there were no significant associations between normalized rate of force development and shear elastic modulus of medial gastrocnemius muscle. CONCLUSION: This suggests that the capacity of rapid force production could be related not to muscle stiffness of the medial gastrocnemius muscle, but to neuromuscular function in older individuals.
Entities:
Keywords:
plantar flexor; rate of force development; shear elastic modulus; ultrasound
Authors: Lauri Stenroth; Elina Sillanpää; Jamie S McPhee; Marco V Narici; Helena Gapeyeva; Mati Pääsuke; Yoann Barnouin; Jean-Yves Hogrel; Gillian Butler-Browne; Astrid Bijlsma; Carel G M Meskers; Andrea B Maier; Taija Finni; Sarianna Sipilä Journal: J Gerontol A Biol Sci Med Sci Date: 2015-03-01 Impact factor: 6.053