In vivo muscle fibre behaviour during counter-movement exercise in humans reveals a significant role for tendon elasticity
268
TL;DR: It was concluded that during CM muscle fibres optimally work almost isometrically, by leaving the task of storing and releasing elastic energy for enhancing exercise performance to the tendon.
read more
Abstract: Six men performed a single ankle plantar flexion exercise in the supine position with the maximal effort with counter movement (CM, plantar flexion preceded by dorsiflexion) and without counter movement (NoCM, plantar flexion only) produced by a sliding table that controlled applied load to the ankle (40 % of the maximal voluntary force). The reaction force at the foot and ankle joint angle were measured using a force plate and a goniometer, respectively. From real-time ultrasonography of the gastrocnemius medialis muscle during the movement, the fascicle length was determined. The estimated peak force, average power, and work at the Achilles’ tendon during the plantar flexion phase in CM were significantly greater than those in NoCM. In CM, in the dorsiflexion phase, fascicle length initially increased with little electromyographic activity, then remained constant while the whole muscle-tendon unit lengthened, before decreasing in the final plantar flexion phase. In NoCM, fascicle length decreased throughout the movement and the fascicle length at the onset of movement was longer than that of the corresponding phase in CM. It was concluded that during CM muscle fibres optimally work almost isometrically, by leaving the task of storing and releasing elastic energy for enhancing exercise performance to the tendon.
read more
Chat with Paper
AI Agents for this Paper
Find similar papers on Google Scholar, PubMed and Arxiv
Write a critical review of this paper
Analyze citations of this paper to find unaddressed research gaps
Citations
Developing maximal neuromuscular power: part 2 - training considerations for improving maximal power production.
TL;DR: This series of reviews focuses on the most important neuromuscular function in many sport performances, the ability to generate maximal muscular power, and the factors that affect maximal power production.
Developing maximal neuromuscular power: Part 1--biological basis of maximal power production.
TL;DR: In this paper, a series of reviews focused on the most important neuromuscular function in many sport performances, the ability to generate maximal muscular power is defined and limited by the force-velocity relationship and affected by the length-tension relationship.
Muscle fascicle and series elastic element length changes along the length of the human gastrocnemius during walking and running
TL;DR: The results of this study have shown that muscle fascicles perform the same actions along the length of the human GM muscle during locomotion, however the distal fascicles tend to shorten more and act at greater pennation angles than the more proximal fascicles.
439
Effects of plyometric and weight training on muscle-tendon complex and jump performance.
Keitaro Kubo,Masanori Morimoto,Teruaki Komuro,Hideaki Yata,Naoya Tsunoda,Hiroaki Kanehisa,Tetsuo Fukunaga +6 more
TL;DR: The results indicate that the jump performance gains after plyometric training are attributed to changes in the mechanical properties of muscle-tendon complex, rather than to the muscle activation strategies.
372
Human tendon adaptation in response to mechanical loading: a systematic review and meta-analysis of exercise intervention studies on healthy adults
TL;DR: The present meta-analysis provides elaborate statistical evidence that tendons are highly responsive to diverse loading regimens and strongly suggests that loading magnitude in particular plays a key role for tendon adaptation in contrast to muscle contraction type.
References
Dynamic properties of mammalian skeletal muscles.
TL;DR: The author examines the relationship between ATPase activity of myosin and intrinsic speed of shortening, and the effects of nerve cross-union on properties of myOSin.
1.9K
Storage of elastic strain energy in muscle and other tissues
TL;DR: The elastic materials involved include muscle in every case, but only in insect flight is the proportion of the energy stored in the muscle substantial.
878
In vivo behaviour of human muscle tendon during walking
Tetsuo Fukunaga,Keitaro Kubo,Yasuo Kawakami,Senshi Fukashiro,Hiroaki Kanehisa,Constantinos N. Maganaris +5 more
TL;DR: Two important features emerged: the muscle contracted near–isometrically in the stance phase, with the fascicles operating at ca.
Architectural and functional features of human triceps surae muscles during contraction
TL;DR: Different lengths and angles of fascicles, and their changes by contraction, might be related to differences in force-producing capabilities of the muscles and elastic characteristics of tendons and aponeuroses.
564
Muscle-fiber pennation angles are greater in hypertrophied than in normal muscles
TL;DR: Muscle-fiber pennation angles were measured in vivo with the use of ultrasonography to investigate the relationship between fiber pennation and muscle size for 32 male subjects, suggesting that muscle hypertrophy involves an increase in fiber Pennation angles.
558