Figure 4
From: Sympathetic modulation of hindlimb muscle contractility is altered in aged rats
Effect of adrenergic blockers on the LST stimulation-induced changes in TF (A,B) and muscle tonus (C,D) of the triceps surae muscles. (A,C) Example responses in each young (a,c) and aged (b,d) rat of the response induced by LST stimulation at 10 or 20 Hz before and after phentolamine (a,b) or propranolol (c,d) administration. (B,D) Graph summary. n = 5–6 rats, including young (open circles) and aged (closed circles) rats. The extent of modulation was expressed as the percent of the control value before administration of phentolamine or propranolol. *P < 0.05 (paired t-test, compared with the control response before injection).
