Human gait parameters reveal a lot about physical and psychological well-being. In addition, gait impairments significantly affect daily life activities and hamper the locomotive freedom of people with neurological or musculoskeletal disorders. However, there is still a need for a portable, user-friendly, costeffective gait characterization device. Therefore, in this study, a feature engineering-based portable gait characterization module is proposed, and a shank-mounted inertial measurement unit (IMU) is utilized for gait phases and event detection. The efficiency of the developed module is estimated on ten healthy subjects for plain terrain walking. A force sensing resistor (FSR) sensorized instrumented insole has been utilised as a reference system to validate the results estimated using the developed module. The performance is estimated with three different classifiers, support vector machine (SVM), K-nearest neighbor (KNN), and linear discriminant analysis (LDA). For gait event identifications, the average classification accuracies depicted by SVM, LDA, and KNN classifiers are 95.69±5.23%, 96.64±5.02%, and 93.63±4.84% (p − value < 0.05), respectively. Furthermore, the confusion matrix demonstrated the insight illustration of predicted and misclassified events for individual classifiers. In summary, the gait events and gait temporal parameters are reliably estimated using a single IMU with SVM or LDA classifier (p − value > 0.05). Additionally, the efficacy of the proposed model for sensor location and subject variability has been evaluated. The performance of LDA and SVM classifier for gait phase prediction has been found invariant (p − value > 0.05) towards sensor location and subject variability.

A straightforward and inexpensive optical nonsurgical technology, PPG(Photoplethysmography) is often used to monitor volumetric changes in blood in the peripheral circulation of humans. It utilizes a luminous source and a light detector at the surface of the skin. In the past few years, a thriving interest has been seen in many researchers around the world in extracting more relevant information from the PPG signal. The second derivative wave of the Photoplethysmography signal offers vital information on the subject's health. Therefore, examination of this waveform may assist doctors and researchers in diagnosing a variety of cardiovascular conditions, such as atherosclerosis and arterial stiffness, which affect the cardiovascular system. Investigating the Photoplethysmography signal's second derivative wave also helps in the early identification and diagnosis of cardiovascular diseases, some of which may not manifest themselves until later stages. Uninterrupted and instantaneous monitoring is an essential comfort that has been made possible because of current technological advancements in sensor technology and wireless networks. This monitoring method allows for early diagnosis and analysis of diseases of this kind. The purpose of this article is first to take a cursory look at some of the recent advancements in wearable PPG-based monitoring technologies as well as some of the issues that come along with them, and pointing some of the possible uses of this technology in clinical settings.