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

ObjectivesTo examine the cross-training effects of a proprioceptive neuromuscular facilitation training (PNF) program on peak torque and endurance.DesignFactorial design.ParticipantsTwenty-three males were assigned to a PNF group (n=12) or a control group (n=11).InterventionsThe 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 measuresIsokinetic 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.ResultsAnalysis 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.ConclusionsCross-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.