Abstract: A growing area within the physical fitness and exercise segment is what is referred to as “Battle Ropes”. Battle Ropes are typically two segments of large diameter rope that are restrained on one end while the user oscillates their hands in an up and down fashion while holding the opposite ends of the rope in their hands. These oscillations create a sine wave in the rope with a given frequency and amplitude. This invention will serve as a real time monitor of said rope motion enabling the user to perform a particular workout based on the rope sine wave characteristics.

Abstract: The invention is a needle electrode module, such as for use in neurodiagnostic monitoring, that helps minimize the risk of needle-stick injuries. As described, the needle electrode module includes a means for preventing the exposure of the distal end of a needle element until the module is placed against a surface. In an embodiment, the distal end of a needle element may be retracted into the needle electrode module when the needle electrode module is removed from the punctured surface and, once retracted, the distal end of the needle may be prevented from being accidentally re-exposed. Several embodiments use a mechanical mechanism to hold the distal end of the needle element in the retracted or exposed positions and a spring force to retract the distal end of the needle.