In vivo muscle mechanics during normal locomotion is dependent on movement amplitude and contraction intensity
Finni Juutinen, T., Komi, P., & Lepola, V. (2001). In vivo muscle mechanics during normal locomotion is dependent on movement amplitude and contraction intensity. Eur J Appl Physiol, 85, 170-176.
Published inEur J Appl Physiol
© Springer. This is a final draft version of an article whose final and definitive form has been published by Springer.
The effects of movement amplitude and contraction intensity on triceps surae and quadriceps femoris muscle function were studied during repetitive hopping. In vivo forces from Achilles and patellar tendons were recorded with the optic fibre technique from eight volunteers. The performances were filmed (200 Hz) to determine changes in muscle-tendon unit length and velocity. When hopping with a small amplitude (23° knee flexion during the ground contact phase), the Achilles tendon was primarily loaded whereas patellar tendon forces were greater in large-amplitude hopping (56° knee flexion). In spite of the different magnitudes of stretch in the quadriceps femoris muscle, the stretching velocity and activity patterns of the quadriceps muscle were similar in both conditions. Simultaneously performed electromyographic (EMG) recordings revealed that preferential preactivation of the gastrocnemius muscle was evident in both jumping conditions. The triceps surae muscle was strongly active in the eccentric phase of small-amplitude hopping. Results from hopping with small knee-joint displacement suggest that there may be a particular frequency and jumping height at which the elastic bouncing is best utilized and at the same time the concentric phase is most economical. Results also support earlier observations that the economy of the shortening phase must be compromised at some point in order to produce more power and improve the jumping height. ...
Publication in research information system
MetadataShow full item record
- Liikuntatieteiden tiedekunta 
Showing items with similar title or keywords.
Distinct muscle-tendon interaction during running at different speeds and in different loading conditions Werkhausen, Amelie; Cronin, Neil; Albracht, Kirsten; Bojsen-Møller, Jens; Seynnes, Olivier R. (American Physiological Society, 2019)The interaction between the Achilles tendon and the triceps surae muscles seems to be modulated differently with various task configurations. Here we tested the hypothesis that the increased forces and ankle joint work ...
In vivo triceps surae and quadriceps femoris muscle function in a squat jump and counter movement jump Finni Juutinen, Taija; Komi, Paavo; Lepola, Vesa (Springer-Verlag, 2000)An optic fibre method was used to measure in humans in vivo Achilles (ATF) and patellar tendon forces (PTF) during submaximal squat jumps (SJ) and counter movement jumps (CMJ). Normal two-legged jumps on a force plate and ...
Finni Juutinen, Taija; Cronin, Neil; Mayfield, D.; Lichtwark, G. A.; Cresswell, A. G. (John Wiley & Sons Ltd; Scandinavian Foundation of Medical Science in Sports, 2017)Lateral connections between muscles provide pathways for myofascial force transmission. To elucidate whether these pathways have functional roles in vivo, we examined whether activation could alter the shear between the ...
The effects of locomotor pattern diversity and ageing on the lower limb joint mechanics and loading during human walking and running Kulmala, Juha-Pekka (University of Jyväskylä, 2015)