Triceps surae fascicle stretch is poorly correlated with short latency stretch reflex size

Cronin, Neil J., Rantalainen, Timo and Avela, Janne 2015, Triceps surae fascicle stretch is poorly correlated with short latency stretch reflex size, Muscle and nerve, vol. 52, no. 2, pp. 245-251, doi: 10.1002/mus.24538.

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Title Triceps surae fascicle stretch is poorly correlated with short latency stretch reflex size
Author(s) Cronin, Neil J.
Rantalainen, TimoORCID iD for Rantalainen, Timo
Avela, Janne
Journal name Muscle and nerve
Volume number 52
Issue number 2
Start page 245
End page 251
Total pages 7
Publisher Wiley
Place of publication London, Eng.
Publication date 2015-08
ISSN 1097-4598
Keyword(s) dorsiflexion stretch
muscle fascicle
reflex EMG
tendon tap
Summary INTRODUCTION: The short latency stretch reflex (SLR) is well described, but the stimulus that evokes the SLR remains elusive. One hypothesis states that reflex size is proportional to muscle fiber stretch, so in this study we examined the relationship between these 2 parameters in human triceps surae muscles. METHODS: Achilles tendon taps and dorsiflexion stretches with different amplitudes and preactivation torques were applied to 6 participants while electromyography and muscle fascicle length changes were recorded in soleus and medial gastrocnemius (MG). RESULTS: In response to tendon taps, neither fascicle length nor velocity changes were correlated with SLR size in either muscle, but accelerometer peaks were observed immediately after hammer-tendon contact. Similar results were obtained after dorsiflexion stretches. CONCLUSION: Muscle fascicle stretch is poorly correlated with SLR size, regardless of perturbation parameters. We attribute the SLR trigger to the transmission of vibration through the lower limb, rather than muscle fiber stretch. Muscle Nerve, 2015.
Language eng
DOI 10.1002/mus.24538
Field of Research 110601 Biomechanics
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2015, Wiley
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Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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