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- W2028021241 abstract "Muscle strain injuries often occur when rapid and forceful contractions are combined with excessive muscle lengthening. The existence of a neural mechanism limiting complete muscle activation during maximal voluntary lengthening actions thereby maintaining torque production within ‘safe’ levels has been postulated. However, the role of this proposed inhibitory mechanism in preventing muscle strain injuries is unclear. Therefore, the aim of this research was to investigate possible tension limiting mechanisms during constant velocity lengthening actions of soleus. Subjects performed isometric and constant velocity lengthening plantar flexion efforts at angular velocities of 5° ·s−1, 15° ·s−1 and 30° ·s−1 on a custom built ankle torque motor. Torquevelocity relationships were determined for a series of unique activation protocols including maximal voluntary activation (MVA), submaximal voluntary activation (SVA, 30%), and submaximal electrical activation (SEA, 30%) of soleus. The influence of co-activation on lengthening torque was also investigated by eliminating antagonist activity of tibialis anterior via anaesthetic block of the common peroneal nerve (prilocain 10% ~5–10ml). Statistical analysis revealed that lengthening torques produced by MVA (142 – 143 N·m) and SVA (44 – 49 N·m) were not significantly different (P ≤ 0.05) from corresponding isometric torques (154 & 46 N·m, respectively). Conversely, SEA torques (59 – 63 N·m) were greater than the isometric value (46 N·m). Furthermore, lengthening torque in the post-block condition was not significantly greater than pre-block torque. It was concluded that tension regulation in lengthening actions occurred during both maximal and submaximal voluntary efforts but not when the muscle was artificially activated. Furthermore, co-activation did not limit lengthening torque. The implications of these findings with respect to the mechanisms of tension regulation and muscle strain injuries will be discussed. Supported by the NSW Sporting Injuries Committee, Australia and the Swedish Medical Research Council." @default.
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- W2028021241 date "2001-05-01" @default.
- W2028021241 modified "2023-09-30" @default.
- W2028021241 title "TENSION REGULATION OF LENGTHENING MUSCLE ACTIONS" @default.
- W2028021241 doi "https://doi.org/10.1097/00005768-200105001-00231" @default.
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