The Deadlift is a weight training exercise where one lifts a loaded barbell (or, in the case of the trapbar deadlift, a loaded trapbar) off the ground from a stabilized bent-over position. It is one of the three gauges of powerlifting, and is an excellent exercise for overall body development if done properly.
The Sumo deadlift is a variation of the deadlift whereby the legs are spread far apart to the sides, mimicking a sumo stance, hence the name. This variation changes the emphasis of the lift to the legs instead of the back, though it still plays a part to a lesser degree. The sumo deadlift is purported to be easier for those with large waists, and if done incorrectly, is capable of placing excessive stress on the hips and hamstrings, as well as the connective tissues of the pelvic bone and by extension, the lower back.
There are three grips to use. Both overhand, both underhand, and a mixed overhand-underhand (sometimes called "staggered" or "mixed") grip. Considering forearm strength, overhand and underhand grips still suffer from the bar potentially rolling about, which the mixed grip is capable of neutralizing, through the physics of reverse torsion. The mixed grip also allows more weight to be used for this reason.
The trapbar deadlift is a variation of the deadlift using a special U-shaped bar (a trapbar). This allows more clearance for the knees to pass "through" the bar.
In addition, the compression can squeeze the spinal roots of the spinal cord, causing nerve-conditions like lumbago or sciatica.
Some weightlifters use special belts to keep their lower back stabilized. Whether or not these belts actually prevent injuries is debated.
Using an underhand grip is potentially hazardous on heavy deadlifts as a supinated grip shortens the bicep muscle and increases the load on it, possibly leading to a rupture of the muscle or connecting tendons. The risk is most notable in individuals without full flexibility in the elbow joint.
To avoid (or minimize the chances of) the dangers mentioned above, some authorities prescribe the following techniques:
The Romanian Deadlift was named by American lifters who saw a World Championship lifter from Romania performing it during the 1950's.
In general, most people will be able to lift more weight with a deadlift than with a squat, owing to using supporting structures (which vary in strength just by their very nature) in a different manner, particularly the back and abdominal muscles. The deadlift makes more use of the back muscles, while the squat makes more use of the abdominal wall.
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