Cross-training effects of a proprioceptive neuromuscular facilitation exercise programme on knee musculature

Abstract

Objectives To examine the cross-training effects of a proprioceptive neuromuscular facilitation training (PNF) program on peak torque and endurance. Design Factorial design. Participants Twenty-three males were assigned to a PNF group ( n=12) or a control group ( n=11). Interventions The PNF program included training of the knee extensor and flexor muscles for a period of 8 weeks, exercising three times a week. PNF training included performance of knee movements through range of motion against manual resistance. Main outcome measures Isokinetic torque and fatigue of the knee flexors and extensors at 60, 180 and 300° s −1 were assessed prior to and immediately after the training period. Results Analysis of variance designs indicated that the PNF group demonstrated significant gains (9.9%) in knee extension torque of the contralateral leg. In contrast, no cross-training effects on peak flexion torque was observed. Conclusions Cross-training effects after PNF exercise were restricted to the knee extensor muscles. Such effects may be important when the aim of a rehabilitation program is to improve the knee extensor muscle function of an immobilized contralateral leg.