Electrocardiography (ECG) is a medical diagnostic procedure used to record the electrical activity of the heart and display it as a waveform. For picking the ECG waveform, wet and dry electrodes can be utilized. Lots of dry electrode related studies have been carried out in different parts of the world. This paper focuses on the acquisition of ECG from the left arm and right arm separately and comparing the waveforms and gain required for the system. In addition to that, different dry electrode materials and dimensions are used to check the acquisition of ECG waveform from the single arm. Dry electrodes employed in this study include copper, brass, phosphor bronze and nickel silver. The various dimensions used in this study are 3[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]3[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm, 2.5[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]2.7[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm, 2.5[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]2.5[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm, 2[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]3[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm, 2[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]2[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm and 1[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]3[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm. A total of five healthy subjects are used in this study for the acquisition of ECG. The results are very much promising in that the gain required for the left arm ECG system is less than that needed for the right arm ECG system and moreover a clear ECG is obtained from the left arm compared to the right arm ECG waveform. All the dry electrodes used in the study can pick the ECG except for the dimension 1[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]3[Formula: see text]cm[Formula: see text][Formula: see text][Formula: see text]0.5[Formula: see text]mm. Copper and brass provide stable output compared to nickel silver and phosphor bronze.

Osteoarthritis (OA), is a joint disease which is consider as incurable in nature. The OA causes results in joint damage. Knee osteoarthritis is one of the major disease which causes damages in the cartilage between femur and tibia. The patellofemoral region is mainly involved in knee osteoarthritis. The main aim of this study is to measure the forces during the walking movement in left and right part of patello femoral joint for OA patients and normal subjects. The objective is to design a circuit to measure forces and to test the difference between OA patients and normal subjects. The hardware circuit was designed using NI ELVIS ( National Instrument Educational Laboratory Virtual Instrumentation Suite), which is used to interface the sensors with the labVIEW software. The labVIEW software is used to acquire data from the sensors. The circuit was designed using two FSR sensors (Force Sensitive Resistor) which are fitted to the upper part of the patellofemoral joint on right and left knee separately. The forces which are obtained by the walking movement within the duration of three minutes. The measured output shows a decrement in force compare to normal and OA subjects and it also has been identified that right knee force is greater than left knee force.