Intermuscular force transmission between human plantarflexor muscles in vivo
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Intermuscular force transmission between human plantarflexor muscles in vivo. / Bojsen-Møller, Jens; Schwartz, Sidse; Kalliokoski, Kari K; Finni, Taija; Magnusson, S Peter; Bojsen-Møller, Jens; Schwartz, Sidse; Kalliokoski, Kari K; Finni, Taija; Magnusson, S Peter.
I: Journal of Applied Physiology, Bind 109, Nr. 6, 01.12.2010, s. 1608-18.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Intermuscular force transmission between human plantarflexor muscles in vivo
AU - Bojsen-Møller, Jens
AU - Schwartz, Sidse
AU - Kalliokoski, Kari K
AU - Finni, Taija
AU - Magnusson, S Peter
AU - Bojsen-Møller, Jens
AU - Schwartz, Sidse
AU - Kalliokoski, Kari K
AU - Finni, Taija
AU - Magnusson, S Peter
PY - 2010/12/1
Y1 - 2010/12/1
N2 - The exact mechanical function of synergist muscles within a human limb in vivo is not well described. Recent studies indicate the existence of a mechanical interaction between muscle actuators that may have functional significance and further play a role for injury mechanisms. The purpose of the present study was to investigate if intermuscular force transmission occurs within and between human plantarflexor muscles in vivo. Seven subjects performed four types of either active contractile tasks or passive joint manipulations: passive knee extension, voluntary isometric plantarflexion, voluntary isometric hallux flexion, passive hallux extension, and selective percutaneous stimulation of the gastrocnemius medialis (MG). In each experiment plantar- and hallux flexion force and corresponding EMG activity were sampled. During all tasks ultrasonography was applied at proximal and distal sites to assess task-induced tissue displacement (which is assumed to represent loading) for the plantarflexor muscles [MG, soleus (SOL), and flexor hallucis longus (FHL)]. Selective MG stimulation and passive knee extension resulted in displacement of both the MG and SOL muscles. Minimal displacement of the triceps surae muscles was seen during passive hallux extension. Large interindividual differences with respect to deep plantarflexor activation during voluntary contractions were observed. The present results suggest that force may be transmitted between the triceps surae muscles in vivo, while only limited evidence was provided for the occurrence of force transfer between the triceps surae and the deeper-lying FHL.
AB - The exact mechanical function of synergist muscles within a human limb in vivo is not well described. Recent studies indicate the existence of a mechanical interaction between muscle actuators that may have functional significance and further play a role for injury mechanisms. The purpose of the present study was to investigate if intermuscular force transmission occurs within and between human plantarflexor muscles in vivo. Seven subjects performed four types of either active contractile tasks or passive joint manipulations: passive knee extension, voluntary isometric plantarflexion, voluntary isometric hallux flexion, passive hallux extension, and selective percutaneous stimulation of the gastrocnemius medialis (MG). In each experiment plantar- and hallux flexion force and corresponding EMG activity were sampled. During all tasks ultrasonography was applied at proximal and distal sites to assess task-induced tissue displacement (which is assumed to represent loading) for the plantarflexor muscles [MG, soleus (SOL), and flexor hallucis longus (FHL)]. Selective MG stimulation and passive knee extension resulted in displacement of both the MG and SOL muscles. Minimal displacement of the triceps surae muscles was seen during passive hallux extension. Large interindividual differences with respect to deep plantarflexor activation during voluntary contractions were observed. The present results suggest that force may be transmitted between the triceps surae muscles in vivo, while only limited evidence was provided for the occurrence of force transfer between the triceps surae and the deeper-lying FHL.
U2 - 10.1152/japplphysiol.01381.2009
DO - 10.1152/japplphysiol.01381.2009
M3 - Journal article
C2 - 20884838
VL - 109
SP - 1608
EP - 1618
JO - Journal of Applied Physiology
JF - Journal of Applied Physiology
SN - 8750-7587
IS - 6
ER -
ID: 34375299