Electromyography Analysis of Human Activities - DataBase 4 (EMAHA-DB4)

The focus of EMAHA-DB4 is on the ADL under different measurement conditions. The data collection procedure is approved by the ethics committee at the Indian Institute of Information Technology, Sri City (No. IIITS/EC/2022/01) and is in accordance with the principles of the Declaration of Helsinki. Prior to measurement sessions, the subjects are familiarized with the experimental protocol and a written informed consent is obtained. A group of 10 healthy subjects without any upper limb pathologies participated in the data collection process. As shown in Table I, A total of 8 activities are performed by each subject. The measurement setup consists of a 5-channel Noraxon Ultium wireless sEMG sensor system. Representative muscle sites (see list 1 below) of the forearm are identified and self-adhesive Ag/AgCl dual electrodes are placed. The signal (sEMG) recorded during an ADL activity is segmented into functional phases: 1) rest 2) action and 3) release. During the rest phase, the subject is instructed to rest the muscles in a natural way. In the action phase, the subject is asked to perform the relevant ADL and in the release phase, the subject has to bring the muscles to a rest state smoothly avoiding any sudden movements. In these measurements, subjects are directed to execute each activity in four different arm positions given in the list below and three different body postures given in the list 1 below. So each activity is performed in 4 × 3 = 12 different scenarios. This setup facilitates analysis of ADL in various scenarios. Specifically, it allows the examination of how a subject’s body posture and arm position impact the activity categorization. I. SENSOR PLACEMENT ON MUSCLE SITES Brachioradialis (BR) Extensor Pollicis Longus (EPL) Abductor Digiti Minimi (ADM) First Dorsal Interosseous (FDI) Extensor Pollicis Brevis (EPB II. List of ADL performed in the experiments Lifting a Bottle Pushing a Door Pulling a Door Phone to Ear Zipping a Bag Putting on Spectacles Pressing a Button On TV Remote III. Body postures: Sit Stand Walk IV. Arm Positions: P1: Forearm in sagittal and transverse plane and upper arm in coronal and sagittal planes P2: Arm at 45 deg to the transverse plane with projections in all the three planes P3: Arm in nearly natural position with stronger projections in coronal and sagittal planes P4: Arm at 0 deg to transverse and sagittal planes