The power grip is when all the fingers, the thumb and the palm of the hand surround an object. Intuitively, we know to pick up something, move or secure our body when utilizing our grasp we want to wrap our whole hand around as much surface area as possible involving each finger.
What is interesting is that when all the fingers are engaged together the amount of force that can be produced by each finger is less than the amount an individual finger can produce when it acts in isolation. An example is the index finger produces 25% more force acting alone rather than in an all-finger contraction. In general the middle finger tends to have the highest contribution to the total force, followed by the ring, index and then little finger.
The thumb is essential in power griping as it provides counter pressure to the fingers wrapped around the object being held and/or manipulated. Increases in motion, grip width, objects shape, arm and wrist positions all affect potential grip force. This makes training of fingers and hands associated with movement during power gripping essential.
Rogers Athletic make variable size power grip wrist rollers for the Pendulum Grip Cart to maximize development and Get and keep your grasp Strong.
 Large Ergonomic Power Grip Wrist Roller
Natural Power Grip Roller
Pendulum Grip Cart
