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Conditioning hops increase triceps surae muscle force and Achilles tendon strain energy in the stretch-shortening cycle
- Publication Year :
- 2018
- Publisher :
- John Wiley & Sons Ltd, 2018.
-
Abstract
- Postactivation potentiation can improve athletic performance, but the underlying mechanisms are poorly understood. This study investigated the effect of conditioning hops on triceps surae muscle force and tendon strain and its contribution to potentiated stretch-shortening cycle (SSC) performance. Thirty-two subjects participated in two experiments. In both experiments, subjects performed three drop jumps (DJs) after prior conditioning with 10 maximal hops, three unconditioned DJs served as control. Ground reaction forces, kinematics, and triceps surae electromyographic activity were recorded. Ultrasound imaging was used to determine fascicle lengths (FASC) of the gastrocnemius (GM) and soleus muscles (experiment 1) and the length of the Achilles tendon (experiment 2) during the DJs. DJ height after the conditioning hops was significantly higher compared to control DJs (experiment 1: +12% and experiment 2: +19%). A significantly shorter GM FASC during the DJs performed after the conditioning hops coincided with an increased force acting on the triceps surae muscle. Moreover, the triceps surae muscle-tendon unit (MTU) showed increased energy absorption during the eccentric phase of the DJs and increased energy release during the concentric phase. The second experiment revealed a higher Achilles tendon strain in DJs performed after the conditioning hops compared to control DJs. No significant differences in muscle activities were observed. The shorter FASC in GM and the larger Achilles tendon strain facilitated MTU energy transfer from the eccentric to the concentric phase during the DJ. Thereby, conditioning hops improved SSC efficacy and DJ performance. peerReviewed
- Subjects :
- Adult
Male
pohkeet
Physical Therapy, Sports Therapy and Rehabilitation
Strain (injury)
drop jump
Athletic Performance
Concentric
Achilles Tendon
Stretch shortening cycle
Young Adult
03 medical and health sciences
ultrasound imaging
0302 clinical medicine
conditioning activity
Triceps surae muscle
medicine
Humans
Eccentric
Orthopedics and Sports Medicine
Ground reaction force
ta315
Muscle, Skeletal
Ultrasonography
Achilles tendon
Electromyography
Chemistry
030229 sport sciences
Anatomy
Fascicle
medicine.disease
Biomechanical Phenomena
post-activation potentiation
medicine.anatomical_structure
Female
hyppääminen
kantajänne
voimaharjoittelu
030217 neurology & neurosurgery
Physical Conditioning, Human
lihasvoima
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....6b3bf0f3600f6201d498b19c1921caa5