Cronin, J, Lawton, T, Harris, N, Kilding, A, and McMaster, DT. A brief review of handgrip strength and sport performance. J Strength Cond Res 31(11): 3187-3217, 2017-Tests of handgrip strength (HGS) and handgrip force (HGF) are commonly used across a number of sporting populations. Measures of HGS and HGF have also been used by practitioners and researchers to evaluate links with sports performance. This article first evaluates the validity and reliability of various handgrip dynamometers (HGD) and HGF sensors, providing recommendations for procedures to ensure that precise and reliable data are collected as part of an athlete's testing battery. Second, the differences in HGS between elite and subelite athletes and the relationships between HGS, HGF, and sports performance are discussed.

/pdf/a-brief-review-of-handgrip-strength-and-sport-performance-484ndiaev5.pdf

A Brief Review of Handgrip Strength and Sport Performance

Embodiments of the present invention include a laser catheter that includes a catheter body, a light guide, and a distal tip that extends beyond the exit aperture of the light guide. In some embodiments, an imaging device is disposed on the distal tip such that the imaging device is distal relative to the exit aperture of the light guide. In some embodiments, the imaging device can be gated to record images during and/or slightly beyond periods when the laser catheter is not activated.

Cardiovascular imaging system

Three types of thin, flexible force sensor were studied under a variety of loading
conditions to determine their suitability for measuring grip force. Static accuracy, hysteresis,
repeatability, and drift errors were established, the effects of shear force and surface curvature
were considered, and dynamic accuracy and drift were measured. Novel tests were developed
to consider dynamic accuracy and sensitivity to shear loadings. Additionally, three sensors were
evaluated in a real-life gripping scenario, measuring grip force during a golf shot. Comments are
made on sensor performance, ease of use, and durability.

/pdf/evaluation-of-thin-flexible-sensors-for-time-resolved-grip-2uq83kjubm.pdf

Evaluation of thin, flexible sensors for time-resolved grip force measurement

A clinical sensing glove system to quantify force, shear, hardness, etc., measured in manual therapies is disclosed. A sensor is disposed in a clinical glove. The sensor undergoes micro-bending, macro-bending, evanescent coupling, a change in resonance, a change in polarization, a change in phase modulation, in response to pressure/force applied. The amount of micro-bending, macro-bending, evanescent coupling, change in resonance, change in polarization, and/or change in phase modulation is proportional to the intensity of the pressure/force. A clinician can quantitatively determine the amount of pressure, force, shear, hardness, rotation, etc., applied.

Clinical force sensing glove

The biodynamics of human hand-arm system is one of the most important foundations for the measurement, evaluation, and risk assessment of hand-transmitted vibration (HTV) exposure. This paper presents a new conceptual model relating factors influencing cause-effect relationships for HTV exposure, a new study strategy, and a comprehensive review of the recent advances in the biodynamics closely associated with HTV exposure. The review covers the following five aspects: theoretical modeling of biodynamic responses, vibration transmissibility, driving-point biodynamic responses, evaluation of anti-vibration gloves, and applied forces. This review finds that some significant advances in each of these aspects have been achieved in the recent years. Several important issues and problems in the biodynamic measurement have been identified and resolved, which has significantly helped improve the reliability and accuracy of the experimental data. The results reported in recent years suggest that, from the point of view of biodynamics, the frequency weighting specified in ISO 5349-1 (2001) overestimates the low frequency effect but underestimates the high frequency effect on the fingers and hand. The major problems, issues, and topics for further studies are also outlined in this paper. It is anticipated that the further studies of the biodynamics of the system will eventually lead to establishment of a robust vibration exposure theory. Although this review focuses on the biodynamics of the hand-arm system, the fundamental concepts and some methodologies reviewed in this paper may also be applicable for the study of whole-body vibration exposure.

Recent advances in biodynamics of human hand-arm system.

Most attempts to measure forces developed by the human hand have been implemented by placing force sensors on the object of interaction. Other researchers have placed sensors just on the subject's fingertips. In this paper, a system is described that measures forces over the entire hand using thin-film sensors and associated electronics. This system was developed by the authors and is able to obtain force readings from up to 60 thin-film sensors at rates of up to 400 samples/s per sensor. The sensors can be placed anywhere on the palm and/or fingers of the hand. The sensor readings, together with a video stream containing information about hand posture, are logged into a portable computer using a multiplexer, analogue-to-digital converter and software developed for the purpose. The system has been successfully used to measure forces involved in a range of everyday tasks such as driving a vehicle, lifting saucepans and hitting a golf ball. In the latter case, results are compared with those from an instrumented golf club. Future applications include the assessment of hand strength following disease, trauma or surgery, and to enable quantitative ergonomic investigations.

The application of force-sensing resistor sensors for measuring forces developed by the human hand.

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The application of force-sensing resistor sensors for measuring forces developed by the human hand.