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First published online December 2, 2005
Journal of Experimental Biology 208, 4585-4592 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01931

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Physiologically adaptive changes of the L₅ afferent neurogram and of the rat soleus EMG activity during 14 days of hindlimb unloading and recovery

L. De-Doncker^*, M. Kasri, F. Picquet and M. Falempin

Laboratoire de Plasticité Neuromusculaire, EA 1032, IFR 118, Bât. SN4, Université des Sciences et Technologies de Lille, F-59655 Villeneuve d'Ascq Cedex, France

View larger version (33K): [in a new window]   Fig. 1. (A) Diagram of the silicon tubing used to record the L5 afferent neurogram. (B) Test of the electrode sensitivity by recording the EMG and L5 afferent activities 4 h after surgery and 6 days after the day of surgery.

View larger version (46K): [in a new window]   Fig. 2. Qualitative physiologically adaptive changes of EMG and L5 afferent activities during 14 days of hindlimb unloading (HU) and recovery. (A) Qualitative representations of the right soleus EMG activity and the right L5 afferent neurogram at the pre-suspension level, at the beginning of the HU period (D0) and on the third (D3), ninth (D9) and fourteenth (D14) days of HU. (B) Qualitative representations of the right soleus EMG activity and the right L5 afferent neurogram on the first (RD0), third (RD3), ninth (RD9) and fourteenth (RD14) day of recovery.

View larger version (20K): [in a new window]   Fig. 3. Physiologically adaptive changes of neuromuscular activities during 14 days of hindlimb unloading (HU) and recovery. Changes of the amplified soleus EMG and L5 afferent activity values (V s–1) are expressed as mean ± S.D. (N=11). *Significant difference from the control (CONT) values; significant difference from the fourteenth day of HU.