Abstract: A pressure sensitive alarm system for solving the problem of arm pump commonly experienced by competitive motocross riders is provided. The system comprises motorcycle grips which incorporate one or more pressure sensors. The pressure sensors provide a signal to a control unit which compares the magnitude of the pressure sensor signal to a predetermined threshold value. When the predetermined threshold value is exceeded the control unit activates an alarm and maintains the alarm until the rider's grip pressure falls below the predetermined threshold value. The predetermined threshold value is a pressure magnitude which when exceeded by a rider is likely to lead the onset of arm pump. Means are provided for individually tailoring the predetermined threshold value to the specific needs of an individual rider.