Knee and ankle joint torque-angle relationships of multi-joint leg extension |
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| Authors: | Hahn Daniel Olvermann Matthias Richtberg Jan Seiberl Wolfgang Schwirtz Ansgar |
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| Institution: | 1. Institute for Aging Research, Hebrew SeniorLife, Boston, MA 02131, USA;2. Beth Israel Deaconess Medical Center, and Harvard Medical School, Boston, MA 02215, USA;1. School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough LE11 3TU, UK;2. Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK;1. Graduate School of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa-shi, Saitama 359-1192, Japan;2. Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa-shi, Saitama 359-1192, Japan;3. College of System Engineering and Science, Shibaura Institute of Technology, 307 Fukasaku, Minuma-ku, Saitama-shi, Saitama 337-0003, Japan;4. National Institute of Fitness and Sports in KANOYA, 1 Shiromizu-cho, Kanoya-shi, Kagoshima 891-2393, Japan;1. Nantes Université, Movement - Interactions - Performance, MIP, UR 4334, F-44000 Nantes, France;2. The University of Queensland, School of Biomedical Sciences, Brisbane, Queensland, Australia;3. Institut Universitaire de France (IUF), Paris, France;4. Université Côte d''Azur, LAMHESS, Nice, France;5. Laboratoire de Physiologie et Évaluation Neuromusculaire, Institut de Myologie, Paris, France;1. Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States;2. Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill and North Carolina State University, Chapel Hill, NC, United States;1. School of Sport Science, Exercise and Health, University of Western Australia, Perth, Australia;2. Sydney Medical School, The University of Sydney, Sydney, Australia;3. The Kolling Institute of Medical Research, Sydney, Australia;4. Department of Orthopaedic Surgery, Princess Margaret Hospital, Perth, Australia;5. Neuroscience Research Australia, Sydney, Australia;6. The University of New South Wales, Sydney, Australia |
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| Abstract: | The force-length-relation (F-l-r) is an important property of skeletal muscle to characterise its function, whereas for in vivo human muscles, torque-angle relationships (T-a-r) represent the maximum muscular capacity as a function of joint angle. However, since in vivo force/torque-length data is only available for rotational single-joint movements the purpose of the present study was to identify torque-angle-relationships for multi-joint leg extension. Therefore, inverse dynamics served for calculation of ankle and knee joint torques of 18 male subjects when performing maximum voluntary isometric contractions in a seated leg press. Measurements in increments of 10° knee angle from 30° to 100° knee flexion resulted in eight discrete angle configurations of hip, knee and ankle joints. For the knee joint we found an ascending-descending T-a-r with a maximum torque of 289.5° ± 43.3 Nm, which closely matches literature data from rotational knee extension. In comparison to literature we observed a shift of optimum knee angle towards knee extension. In contrast, the T-a-r of the ankle joint vastly differed from relationships obtained for isolated plantar flexion. For the ankle T-a-r derived from multi-joint leg extension subjects operated over different sections of the force-length curve, but the ankle T-a-r derived from isolated joint efforts was over the ascending limb for all subjects. Moreover, mean maximum torque of 234.7 ± 56.6 Nm exceeded maximal strength of isolated plantar flexion (185.7 ± 27.8 Nm). From these findings we conclude that muscle function between isolated and more physiological multi-joint tasks differs. This should be considered for ergonomic and sports optimisation as well as for modelling and simulation of human movement. |
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