A correlation study of weak core muscles with hamstring muscles fexibility in young adults

Abstract

Background Hamstring, being a two-joint muscle, tends to shorten over time, resulting in tightness, afecting performance in daily activities and is also capable of generating exaggerated posterior pelvic tilt, leading to decreased lumbar lordosis. Weak core muscles have been associated with hamstring tightness, and strengthening the core has been attempted in an efort to relax the hamstring tightness. It is believed that the hamstrings overact and over a period of time tightens, when the core is weak, to compensate for postural stability. Method Thirty-three subjects, both male and females with and without hamstring tightness, were assessed for their core endurance through McGill’s core endurance test battery. It was followed by active knee extension test to determine degree of hamstring tightness on both sides. Correlation between the two variables was statistically analyzed. Results Pearson’s correlation was used to analyze the collected data. A moderate positive but signifcant correlation (p=0.02) was found between fexor endurance test and active knee extension (both sides). A weak positive but signifcant correlation (p=0.05) was found between extensor endurance test and active knee extension (both sides). Correlation between the right and left lateral bridge with their respective side hamstring fexibility was negative and not signifcant (p=0.916 (right lateral torso endurance); p=0.339 (left lateral torso endurance)). Conclusion Since there is a moderate positive but signifcant correlation between the fexion torso endurance test and both side hamstring fexibility and a weak positive but signifcant correlation between extension torso endurance test and both side hamstring fexibility, the core (fexor, extensor, and lateral) should be thought of as a whole unit when strengthening in order to maintain and improve hamstring fexibility.