Abstract: A percussive massage device includes a housing and a shaft configured to reciprocate linearly along a reciprocation axis. The shaft includes a distal end configured to electrically connect to a therapeutic attachment and a proximal end opposite the distal end. The percussive massage device includes a bracket that is immovable relative to the housing. The percussive massage device includes an electronics assembly including a controller located on an opposite side of the bracket from the shaft. The percussive massage device includes a coil spring extending from the bracket to the proximal end of the shaft and a cable that provides an electrical connection between the shaft and the controller. The cable includes a coil portion that follows the shape of the coil spring.

Abstract: A mobile apparatus that is automated to measure controlled and applied forces and moments to sport surfaces allowing for performance and safety assessment of athletic apparel and athletic surfaces, such as natural or artificial turf. The apparatus is capable of using not only shear and compressive forces, but also rotational moments, and all prescribed forces and moments in combination at the same or different times. The apparatus and related system can link these forces and moments together and combine them to more closely mimic behaviors of a human foot during an athletic movement, thereby applying and measuring interactions between all forces and moments at the same or different times.

Abstract: A mobile apparatus that is automated to measure controlled and applied forces to sport surfaces allowing for safety assessment of athletic apparel and athletic surfaces, such as natural or artificial turf. The apparatus is capable of using not only horizontal and vertical forces, but also rotational moments, and all prescribed forces and moments in combination at the same or different times. The apparatus and related system can apply horizontal and vertical forces, and rotational moments, and link these forces and moments together and combine them to more closely mimic behavior of human foot during an athletic movement, thereby applying and measuring interactions between all forces and moments at the same or different times.

Abstract: A mobile apparatus that is automated to measure controlled and applied forces to sport surfaces allowing for safety assessment of athletic apparel and athletic surfaces, such as natural or artificial turf. The apparatus is capable of using not only horizontal and vertical forces, but also rotational moments, and all prescribed forces and moments in combination at the same or different times. The apparatus and related system can apply horizontal and vertical forces, and rotational moments, and link these forces and moments together and combine them to more closely mimic behavior of human foot during an athletic movement, thereby applying and measuring interactions between all forces and moments at the same or different times.