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Stiffness regulation during stretch-shortening cycle exercise
Published inStudies in Sport, Physical Education and Health
The present series of studies were designed to investigate the motor control mechanism during and after stretch-shortening cycle (SSC) exercise. Special emphasis was placed on stiffness regulation during SSC exercise. Neuromuscular mechanisms of the SSC action were studied in non-fatigued situations as well as in exhaustive, SSC exercise-induced fatigue conditions. In non-fatigue situations SSC performance can be characterized by a combination of pre-landing joint kinematics and post-landing muscle-tendon stiffness during the eccentric phase of the cycle. The centrally mediated pre-landing activity and eccentric action of the cycle seem therefore to play a role in regulating SSC. In the fatigue experiment, exhaustive SSC exercise induced delayed and slow recovery of performance and stiffness accompanied with delayed muscle damage, especially in the eccentric part of the cycle. Reduced and delayed stiffness was related to the damage-induced movement alteration of the SSC action. This may suggest that a pain-induced mechanism can have an inhibitory influence on the movement strategy. During SSC exercise, a great amount of alteration was observed in the prelanding kinematics, which indicates greater sensitivity on the part of the pre-landing motor control strategy for the functional requirement of the peripheral system. Prelanding ankle joint kinematics influenced post-landing stiffness and performance. In addition, alteration in post-landing stiffness was related to post-exercise delayed muscle damage. These interactions emphasize the chain reaction between pre-landing movement strategy, post-landing muscle mechanics and post-exercise performance. During the course of the SSC exercise, the neuromuscular adaptation process flexibly adapts across the joints and action phases of SSC. Consequently, the present series of studies indicates the possibility that the central nervous system maintains an optimum balance between the facilitation and inhibition of the peripheral system in terms of stiffness regulation during SSC exercise. ...
- Artikkeli I: Horita, T., Komi, P. V., Nicol, C. and Kyröläinen, H. (1996). Stretch shortening cycle fatigue: interactions among joint stiffness, reflex, and muscle mechanical performance in the drop jump. European Journal of Applied Physiology and Occupational Physiology, 73, 393–403. DOI: 10.1007/BF00334415
- Artikkeli II: Horita, T., Komi, P. V., Nicol, C. and Kyröläinen, H. (1999). Effect of exhaustive stretch-shortening cycle exercise on the time course of mechanical behaviour in the drop jump: possible role of muscle damage. European Journal of Applied Physiology and Occupational Physiology, 79, 160–167. DOI: 10.1007/s004210050490
- Artikkeli III: Horita, T., Komi, P., Nicol, C., & Kyröläinen, H. (2002). Interaction between pre-landing activities and stiffness regulation of the knee joint musculoskeletal system in the drop jump: implications to performance. European Journal of Applied Physiology, 88(1-2), 76-84. DOI: 10.1007/s00421-002-0673-6
- Artikkeli IV: Horita, T., Komi, P., Avela, J., & Hämäläinen, I. (2003). Exhaustive stretch-shortening cycle (SSC) exercise causes greater impairment in SSC performance than in concentric performance. European Journal of Applied Physiology, 88, 527–534. DOI: 10.1007/s00421-002-0716-z
- Artikkeli V: Horita, T., Komi, P. V., Hämäläinen, I. and Avela, J. (1999). Changes in neuromuscular performance during repeated stretch-shortening cycle (SSC) exercise I: adaptation patterns in the joint kinematics and electromyographic activities. Submitted.
- Artikkeli VI: Horita, T., Komi, P. V., Hämäläinen, I. and Avela, J. (1999). Changes in neuromuscular performance during repeated stretch-shortening cycle (SSC) exercise II: interaction between joint kinematics and time-varying stiffness regulation. Submitted.
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