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Altered reflex sensitivity after repeated and prolonged passive muscle stretching.
Evidence is presented that the mechanism that decreases the sensitivity of short-latency reflexes can be activated because of RPS, and the origin of this system seems to be a reduction in the activity of the large-diameter afferents, resulting from the reduced sensitivity of the muscle spindles to repeated stretch.
Knee and ankle joint stiffness in sprint running.
- S. Kuitunen, P. Komi, H. Kyröläinen
- Biology, EngineeringMedicine and science in sports and exercise
In sprint running the spring-like behavior of the leg might be adjusted by changing the stiffness of the knee joint, which may depend on (constant) tendon stiffness because of its dominating role in triceps surae muscle-tendon unit.
A simple method for measuring stiffness during running.
- J. Morin, G. Dalleau, H. Kyröläinen, T. Jeannin, A. Belli
- Engineering, BiologyJournal of applied biomechanics
- 1 May 2005
A new "sine-wave" method for measuring stiffness during running based on the modeling of the force-time curve by a sine function that allows leg and vertical stiffness to be estimated from just a few simple mechanical parameters.
Effects of marathon running on running economy and kinematics
- H. Kyröläinen, T. Pullinen, R. Candau, J. Avela, P. Huttunen, P. Komi
- EducationEuropean Journal of Applied Physiology
- 1 July 2000
Results demonstrate clearly that weakened running economy cannot be explained by changes in running mechanics, and it is suggested that the increased physiological loading is due to several mechanisms: increased utilization of fat as an energy substrate, increased demands of body temperature regulation, and possible muscle damage.
Biomechanical factors affecting running economy.
The increased EMG of working muscles and the associated increase in power output may partly explain the increased energy expenditure with increasing running speed.
International Physical Activity Questionnaire: Validity against fitness.
- M. Fogelholm, J. Malmberg, P. Oja
- Medicine, EducationMedicine and science in sports and exercise
- 1 April 2006
An evident need exists to develop IPAQ further to solve the apparent overreporting by a considerable proportion of sedentary individuals and the weekly frequency of vigorous physical activity showed a positive association with fitness through all six categories.
Reduced reflex sensitivity persists several days after long-lasting stretch-shortening cycle exercise.
It is suggested that the acute reduction in reflex sensitivity is of reflex origin and due to two active mechanisms, disfacilitation and presynaptic inhibition, and the delayed second decline in the sensitivity of some reflex parameters may be attributable to the secondary injury, because of some inflammatory response to the muscle damage.
Interaction between pre-landing activities and stiffness regulation of the knee joint musculoskeletal system in the drop jump: implications to performance
- T. Horita, P. Komi, C. Nicol, H. Kyröläinen
- Engineering, BiologyEuropean Journal of Applied Physiology
- 3 September 2002
It can be suggested that the centrally pre-programmed activity and the associated elastic behavior of the SEC in the knee extensor muscle in conjunction with the muscle contractile property play a major role in regulating the performance in DJ.
Changes in muscle activity with increasing running speed
A more powerful force production in the optimal direction for increasing running speed effectively requires increased EMG activity of the two-joint muscles (biceps femoris, rectus femoris and gastrocnemius) during the entire running cycle.
Effects of muscle – tendon length on joint moment and power during sprint starts
- A. Mero, S. Kuitunen, M. Harland, H. Kyröläinen, P. Komi
- BiologyJournal of sports sciences
- 1 February 2006
The results suggest that the longer initial muscle – tendon lengths of the gastrocnemius and soleus in the block phase at the beginning of force production contribute to the greater peak ankle joint moment and power and consequently the greater block velocity during the sprint start.