Grip strength is the force applied by the hand to pull on or suspend from objects and is a specific part of hand strength. Optimum-sized objects permit the hand to wrap around a cylindrical shape with a diameter from 1 inch (2.5 cm) to 3 inches (7.6 cm). Stair rails are an example of where shape and diameter are critical for proper grip in case of a fall. Another grip strength that has been studied is the grip used when using a hammer or other hand tools. In applications of grip strength, the wrist must be in a neutral position to avoid developing cumulative trauma disorders. Grip strength is a general term also used to refer to the physical strength of an animal and, for athletes, to the muscular power and force that can be generated with the hands. In athletics, grip strength is critical for rock climbers and is an important factor in strongman competitions and weight lifting. Grip strength training is also a major feature in martial arts and can be useful in various professions where people must work with their hands.
Types of grip
The human hand can be used to grip objects in several different positions. These different positions require different types of grip strength which are typically quantified based on the way the hand is being used. The crush grip is what is most commonly thought of as "grip". It involves a handshake-type grip, where the object being gripped rests firmly against the palm and all fingers. A strong crush grip is useful in bone-crushing handshakes, or for breaking objects with pressure. In a pinch grip, the fingers are on one side of an object, and the thumb is on the other. Typically, an object lifted in a pinch grip does not touch the palm. This is generally considered a weaker grip position. The pinch grip is used when grabbing something like a weight plate or lifting a sheet of plywood by the top edge. A support grip typically involves holding something, such as the handle of a bucket, for a long time. This type of strength is epitomized by the Farmer's walk competitive event, where a bucket is filled with sand or water and carried over a long distance. A great deal of muscular endurance is necessary to have a good carrying grip.
Normative data There has been extensive medical and ergonomic research looking at grip strength, which has found that 95% of men have a grip strength greater than 90% of women. Averages also exist for different types of grip in different positions. Grip strength increases or decreases depending on the arm position at which the grip strength is being measured. A person's grip strength usually results in having the strongest grip strength when their arm is extended at 90° before their body, as opposed to the other extreme arm positions, rested at one's side or held straight up above one's head. Grip strength is not optimal if one's arm is extended backwards beyond the resting position at the body's sides. It can be concluded that grip strength is affected via the different arm muscles and their ability to contract.
In medicine Grip strength is often used in medicine as a specific type of hand strength. The purpose of this testing is diverse, including to diagnose diseases, to evaluate and compare treatments, to document progression of muscle strength, and to provide feedback during the rehabilitation process as a measure indicating the level of hand function. For example, it is used to indicate changes in hand strength after hand surgery or after a rehabilitation program. By asking subjects to maintain a maximum contraction for longer periods, it can be used as a measure of fatigue. It is also able to predict a decline in function in old age. The World Health Organization has identified Grip Strength as an indicator of vitality for aging populations. Since the above-mentioned grips involve the action of a large number of different joints and muscle groups, grip strength is not always very sensitive to measure individual muscle groups in medicine. For this purpose, dynamometers have been developed that provide more specific information on individual muscles in the hand such as the Rotterdam Intrinsic Hand Myometer (RIHM). In medicine, doctors sometimes use grip strength to test a patient's mentality, as grip strength directly correlates to mental state. Grip strength is also used to measure the degree of rehabilitation from injuries; all other things being equal, it will vary with general condition. Additionally, grip strength can be used to determine a patient's physical stability. Measuring this in intervals allows a doctor to determine if a patient is making progress or if different methods need to be used. There is a direct correlation between grip strength of older people and their overall body strength. This correlation helps doctors with treating the elderly a lot, because it allows doctors to see how well an elderly person is functioning. Relative handgrip strength, handgrip measure divided by body mass index (BMI), affects the future onset of diabetes and prediabetes. A stronger handgrip is linked with less diabetes cases. Strengthening the grip strength helps players recover from sport injuries such as tennis elbow.
Quantified measures of health status in older adults As a measure of strength required for older adults to perform heavy tasks (such as carrying 11 kilograms (24 lb) objects), minimum grip strength for men was determined to be 28.5 kilograms (63 lb) and for women 18.5 kilograms (41 lb). Six studies correlating grip strength with the six minute walk test determined "slow" to vary between 23.2 kilograms (51 lb) to 39 kilograms (86 lb) for men, and 15.9 kilograms (35 lb) to 22 kilograms (49 lb) for women.
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