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Original Research

IJHRS. 2013; 2(4): 186-191


Effect of Knee Joint Mobilization on Quadriceps Muscle Strength

Ali Ghanbari, Shirin Kamalgharibi.




Abstract

Background: Mobilization can affect motor unit activity in the muscles functioning over the joints and improve muscle strength by suppressing inhibitory reflexes. Several researchers have investigated the effect of mobilization on the strength of different muscles; however, there is no research on the effect of knee joint mobilization on quadriceps muscle strength.

Objectives: To investigate the immediate effect of a single session of tibiofemoral joint mobilization on quadriceps muscle strength in healthy young women.

Materials and Methods: This Quasi experimental study (Repeated measures design) was conducted a motion analysis laboratory at a large medical university in the Middle East. Healthy women volunteers currently enrolled at the university participated in this study. Grade 4 mobilization in a posterior-anterior direction was performed at the knee joint for 3 minutes while the individual was seated with the joint in 90° flexion. Before and 30 minutes after the intervention, quadriceps strength was measured as maximal voluntary isometric contractions (MVIC)(in Newton) by a digital dynamometer with the participant seated and the knee joint at 90° flexion.

Results: MVIC were significantly larger than the pre-mobilization value immediately (P=0.0001) and 30 minutes post joint mobilization (P=0.0001).

Conclusion: Mobilization increased quadriceps strength and the increase persisted for 30 minutes. Increasing knee joint mobility may remove neuromuscular inhibition on the quadriceps and thus enhance muscle strength. The technique may have the potential to be an effective treatment in re-education programs for the quadriceps.

Key words: Joint mobilization, Muscle strength, Maximal voluntary contraction, Arthrokinetic reflex






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