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Neuromuscular mechanics and hopping training in elderly

Hoffrén-Mikkola, Merja, Ishikawa, Masaki, Rantalainen, Timo, Avela, Janne and Komi, Paavo V. 2015, Neuromuscular mechanics and hopping training in elderly, European journal of applied physiology, vol. 115, no. 5, pp. 863-877, doi: 10.1007/s00421-014-3065-9.

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Title Neuromuscular mechanics and hopping training in elderly
Author(s) Hoffrén-Mikkola, Merja
Ishikawa, Masaki
Rantalainen, TimoORCID iD for Rantalainen, Timo orcid.org/0000-0001-6977-4782
Avela, Janne
Komi, Paavo V.
Journal name European journal of applied physiology
Volume number 115
Issue number 5
Start page 863
End page 877
Total pages 15
Publisher Springer
Place of publication Heidelberg, Germany
Publication date 2015-05-01
ISSN 1439-6319
Keyword(s) Aging
Electromyography
Gastrocnemius medialis
Stretch–shortening cycle
Tendon
Ultrasound
Summary Purpose: The present study examined the effects of repetitive hopping training on muscle activation profiles and fascicle–tendon interaction in the elderly. Methods: 20 physically active elderly men were randomly assigned for training (TG) and control groups (CG). TG performed supervised bilateral short contact hopping training with progressively increasing training volume. Measurements were performed before the training period (BEF) as well as after 2 weeks (2 W) and 11 weeks (11 W) of training. During measurements, the gastrocnemius medialis–muscle (GaM) fascicle and its outer Achilles tendon length changes during hopping were examined by ultrasonography together with electromyographic (EMG) activities of calf muscles, kinematics, and kinetics. Results: At 2 W, the ankle joint stiffness was increased by 21.0 ± 19.3 % and contact time decreased by 9.4 ± 7.8 % in TG. Thereafter, from 2–11 W the jumping height increased 56.2 ± 18.1 % in TG. Simultaneously, tendon forces increased 24.3 ± 19.0 % but tendon stiffness did not change. GaM fascicles shifted to shorter operating lengths after training without any changes in their length modifications during the contact phase of hopping. Normalized EMG amplitudes during hopping did not change with training. Conclusions: The present study shows that 11 W of hopping training improves the performance of physically active elderly men. This improvement is achieved with shorter GaM operating lengths and, therefore, increased fascicle stiffness and improved tendon utilization after training. Based on these results, hopping training could be recommended for healthy fit elderly to retain and improve rapid force production capacity.
Language eng
DOI 10.1007/s00421-014-3065-9
Field of Research 110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920503 Health Related to Specific Ethnic Groups
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Springer
Persistent URL http://hdl.handle.net/10536/DRO/DU:30078359

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