Interaction between elastic energy utilization and active state development within the work enhancing mechanism during countermovement.

The purpose of this study was to investigate the interaction between elastic energy utilization and the time available for active state development during countermovement, and to determine the contributions of these factors in enhancing work output from a quantitative standpoint. Especially, we focused on the effect of length variation of the series elastic element (SEE) and the speed of active state development. A Hill-type model of the muscle tendon complex (MTC) was constructed. A range of SEE lengths (between 0.625 and 10 times the optimal length of the contractile element) and a range of active state development rates were investigated. Forward dynamics simulations were performed to evaluate the causal factors for the gain in height during concentric (CO) and countermovement (CM) conditions. Simulated outputs suggested that the contribution of the time available for active state development was larger than the contribution of elastic energy utilization for a shorter SEE muscle. On the other hand, the contribution of the elastic energy utilization was larger for a longer SEE muscle. Additionally, the work output of the SEE in CM was considerably augmented due to increasing the speed of active state development. As results, two main findings were obtained. First, a quantitative discussion was developed regarding how the elastic energy utilization and the time available for active state development are contributing within the work enhancing mechanism. Second, it was found that elastic energy utilization and the time available for active state development have a synergistic effect during countermovement.

[1]  P. Komi,et al.  Utilization of stored elastic energy in leg extensor muscles by men and women. , 1978, Medicine and science in sports.

[2]  G. Loeb,et al.  Feedback gains for correcting small perturbations to standing posture , 1991 .

[3]  W Herzog,et al.  The history dependence of force production in mammalian skeletal muscle following stretch-shortening and shortening-stretch cycles. , 2000, Journal of biomechanics.

[4]  Hiroaki Kanehisa,et al.  Influences of tendon stiffness, joint stiffness, and electromyographic activity on jump performances using single joint , 2007, European Journal of Applied Physiology.

[5]  M. Bobbert,et al.  Mechanical output from individual muscles during explosive leg extensions: the role of biarticular muscles. , 1996, Journal of biomechanics.

[6]  T Fukunaga,et al.  Influence of elastic properties of tendon structures on jump performance in humans. , 1999, Journal of applied physiology.

[7]  Gerrit Jan van Ingen Schenau,et al.  Does Elastic Energy Enhance Work and Efficiency in the Stretch-Shortening Cycle? , 1997 .

[8]  F. Zajac,et al.  A musculoskeletal model of the human lower extremity: the effect of muscle, tendon, and moment arm on the moment-angle relationship of musculotendon actuators at the hip, knee, and ankle. , 1990, Journal of biomechanics.

[9]  P Apor,et al.  Store and recoil of elastic energy in slow and fast types of human skeletal muscles. , 1982, Acta physiologica Scandinavica.

[10]  A. Ivy,et al.  Some parameters of sterol metabolism in man on a sterol- and fat-free diet. , 1957, Journal of applied physiology.

[11]  E. Asmussen,et al.  Storage of elastic energy in skeletal muscles in man. , 1974, Acta physiologica Scandinavica.

[12]  H. M. Toussaint,et al.  Positive work as a function of eccentric load in maximal leg extension movements , 2004, European Journal of Applied Physiology and Occupational Physiology.

[13]  W Herzog,et al.  Force-length properties in stable skeletal muscle fibers--theoretical considerations. , 1996, Journal of biomechanics.

[14]  F. Zajac.  Muscle and tendon: properties, models, scaling, and application to biomechanics and motor control. , 1989, Critical reviews in biomedical engineering.

[15]  M. Noble,et al.  Enhancement of mechanical performance by stretch during tetanic contractions of vertebrate skeletal muscle fibres. , 1978, The Journal of physiology.

[16]  M. Pandy,et al.  Storage and utilization of elastic strain energy during jumping. , 1993, Journal of Biomechanics.

[17]  A. Hill.  The heat of shortening and the dynamic constants of muscle , 1938 .

[18]  A. E. Chapman.  The Mechanical Properties of Human Muscle , 1985, Exercise and sport sciences reviews.

[19]  P. Komi.  Stretch-shortening cycle: a powerful model to study normal and fatigued muscle. , 2000, Journal of biomechanics.

[20]  Maarten F Bobbert,et al.  Is the effect of a countermovement on jump height due to active state development? , 2005, Medicine and science in sports and exercise.

[21]  Akinori Nagano,et al.  Effects of the length ratio between the contractile element and the series elastic element on an explosive muscular performance. , 2004, Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology.

[22]  Akinori Nagano,et al.  Resonance in the human medial gastrocnemius muscle during cyclic ankle bending exercise. , 2006, Journal of applied physiology.

[23]  H. Hatze,et al.  A myocybernetic control model of skeletal muscle , 1977, Biological Cybernetics.

[24]  A. V. van Soest,et al.  Why is countermovement jump height greater than squat jump height? , 1996, Medicine and science in sports and exercise.

[25]  M F Bobbert,et al.  Drop Jumping as a Training Method for Jumping Ability , 1990, Sports medicine.

[26]  G Grimby,et al.  Potentiation of concentric plantar flexion torque following eccentric and isometric muscle actions. , 1994, Acta physiologica Scandinavica.

[27]  V. Dietz,et al.  Neuronal mechanisms of human locomotion. , 1979, Journal of neurophysiology.

[28]  Graham E. Caldwell,et al.  Tendon Elasticity and Relative Length: Effects on the Hill Two-Component Muscle Model , 1995 .

[29]  A. J. van den Bogert,et al.  Intrinsic muscle properties facilitate locomotor control - a computer simulation study. , 1998, Motor control.