Co-activation Index of Muscles Across Knee and Ankle during Sit to Stand in Normal Young Individuals: A Pilot Study Ravichandran Priyadharshini G1, Raja Kavitha2, Gupta Saumen3 1Assistant Professor, Padmashree Dr. D.Y. Patil College Of Physiotherapy, Dr.D.Y.Patil Vidyapeeth, Pune 2Principal, J.S.S College of Physiotherapy, Mysore 3Lecturer, J.S.S College of Physiotherapy, Mysore Online published on 19 June, 2015. Abstract Background Loss of selective motor output is a major component for impaired mobility, which has been attributed to increased co-activation among individuals with supraspinal lesions. Increased coactivation of antagonist muscle contributes to the pathomechanics in the joint by weakening the agonist muscle function. Transitional movements like sit to stand is a prerequisite for many functional activity of daily living. Our main aim is to study and quantify co-activation across knee and ankle during sit to stand which can be used as an outcome for therapeutic purposes. Methodology Six healthy young adults (age: 22.6 ± 2.4yrs) participated in the study. Participants performed Sit to stand movement. Muscle activity from quadriceps, hamstring, tibialis anterior and gastrocnemius were recorded by using EMG and simultaneous video was recorded to analyse the quality of movement. The best three trials were taken to calculate co-activation index across knee and ankle. Results and observation Co-activation index across knee was found to be 58.07±21.81% and that of ankle was 29.24±2.85%. Constant firing was observed in tibialis anterior throughout the movement. Maximum activity was seen in quadriceps during the descent phase of sit to stand. Top Keywords Electromyogram, Rehabilitation, Strategy for Achieving Movement, Transition Movement. Top |