Effect of downhill running on motoneuron pool excitability

downhill running on motoneuron pool excitability. J. Appl. Phys-iol. 73(3): 968-973, 1992.-The purpose of this study was to compare alterations in motoneuron pool excitability after ec-centric-biased (ECC-B) downhill running exercise with non-biased (NO-B) level running exercise. Six male subjects (25-34 yr) participated in the study, which included ECC-B exercise (-10 % grade) and NO-B exercise (0 % grade) at 50 % of maxi-mal 0, uptake for 20 min. The control trial consisted of 20 min of quiet rest with all subjects participating in all conditions (repeated measures). Motoneuron pool excitability was mea-sured by the Hoffman reflex (H-wave), which was expressed as a ratio (H/M ratio) of the maximal electrically stimulated mus-cle action potential (M-wave). NO-B exercise resulted in a 9.3 t 2.7 % (SE) reduction in the H/M ratio. ECC-B exercise resulted in a 24.6 t 5.7 % reduction in the ratio (P < 0.05 fo