Searching for just a few words should be enough to get started. If you need to make more complex queries, use the tips below to guide you.
Article type: Research Article
Authors: Heinke, Lars N.a; * | Knicker, Axel J.a; b | Albracht, Kirstenc; d
Affiliations: [a] Institute of Movement and Neuroscience, German Sports University, Cologne, Germany | [b] Sports Performance Research Institute of New Zealand, Auckland University of Technology, Auckland, New Zealand | [c] Institute of Biomechanics and Orthopaedics, German Sports University, Cologne, Germany | [d] Faculty of Medical Engineering and Technomathematics, Aachen University of Applied Science, Jülich, Germany
Correspondence: [*] Corresponding author: Lars N. Heinke, Institute of Movement and Neuroscience, German Sports University, Am Sportpark Müngersdorf 6, 50933 Cologne, North Rheine-Westfalia, Germany. Tel.: +49 221 4982 3322; Fax: +49 221 4973 3454; E-mail: l.heinke@dshs-koeln.de.
Abstract: BACKGROUND: Muscle stretch reflexes are widely considered to beneficially influence joint stability and power generation in the lower limbs. While in the upper limbs and especially in the muscles surrounding the shoulder joint such evidence is lacking. OBJECTIVE: To quantify the electromyographical response in the muscles crossing the shoulder of specifically trained overhead athletes to an anterior perturbation force. METHODS: Twenty healthy male participants performed six sets of different external shoulder rotation stretches on an isokinetic dynamometer over a range of amplitudes and muscle pre-activation moment levels. All stretches were applied with a dynamometer acceleration of 10,000∘/s2 and a velocity of 150∘/s. Electromyographical response was measured via sEMG. RESULTS: Consistent reflexes were not observed in all experimental conditions. The reflex latencies revealed a significant muscle main effect (F (2,228) = 99.31, p< 0.001; η2= 0.466; f= 0.934) and a pre-activation main effect (F (1,228) = 142.21, p< 0.001; η2= 0.384; f= 1.418). The stretch reflex amplitude yielded a significant pre-activation main effect (F (1,222) = 470.373, p< 0.001; η2= 0.679; f= 1.454). CONCLUSION: Short latency muscle reflexes showed a tendency to an anterior to posterior muscle recruitment whereby the main internal rotator muscles of the shoulder revealed the most consistent results.
Keywords: Elastic energy storage, stretch reflex, isokinetic dynamometry, throwing, shoulder perturbation, external shoulder rotation
DOI: 10.3233/IES-184111
Journal: Isokinetics and Exercise Science, vol. 26, no. 4, pp. 265-274, 2018
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
USA
Tel: +1 703 830 6300
Fax: +1 703 830 2300
sales@iospress.com
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
IOS Press
Nieuwe Hemweg 6B
1013 BG Amsterdam
The Netherlands
Tel: +31 20 688 3355
Fax: +31 20 687 0091
info@iospress.nl
For editorial issues, permissions, book requests, submissions and proceedings, contact the Amsterdam office info@iospress.nl
Inspirees International (China Office)
Ciyunsi Beili 207(CapitaLand), Bld 1, 7-901
100025, Beijing
China
Free service line: 400 661 8717
Fax: +86 10 8446 7947
china@iospress.cn
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
如果您在出版方面需要帮助或有任何建, 件至: editorial@iospress.nl