Many bodybuilders believe that using very heavy weights for their workout sessions will lead to quicker results when compared with a lighter training philosophy, and this theory is correct to a degree. Heavy weight and lower rep sessions do produce larger muscles, so it's no shock that most who achieve muscle building success perform at least a percentage of their weight training workout sessions using a low rep philosophy.
Yet, the problem for a large number of bodybuilders is that their desire for low rep weight lifting exercise sessions far too often causes them to abandon proper form, which can lead to severe injury. If a legitimate study were conducted, I would not be surprised to find that the majority of those who experience weight training injuries is using poor form, which causes muscles to function in awkward ways, resulting in muscle tears and strains. In fact, muscle mass increase is maximized only if constant weight training can be maintained for an extended period, and many individuals find themselves taking unplanned vacations from their workout sessions due to severe injuries stemming specifically from improper exercise execution.
The desire is strong to loosen up form in order to increase weight used for particular exercise, especially when using heavy weight and low reps during a workout session, and when a bodybuilder does not immediately fix such behavior, he or she will soon alter weight training form to the point where the exercise is no longer safe, and severe injury is likely to result.
What all bodybuilders must remember as they pursue maximum muscle mass increase is that the term "heavy" is relative, and correct form is far more important than the weight used in each workout session. Therefore, when you are considering the use of heavier weight for a bodybuilding exercise, make sure that you are doing so with correct exercise form in mind, adding weight in very small increments to avoid incorrect, awkward exercise performance.
If you find yourself altering exercise form to allow for greater weight in a given exercise, then you should immediately reduce the amount of weight by 10-20 pounds, fosting a connection between your mind and muscles during each set, only increasing the amount of weight used (in small increments) when you are once again confident that form is 100% correct. It's unfortunately very easy to become misled into believing that because you have not increased weight for a few exercise sessions that your muscle building endeavors will suffer, when in reality, it's very common to stay with the same weight for several workouts while still gaining muscle size . But by using incorrect form to try and artificially strengthen strength in a given bodybuilding exercise, you will actually risk harm muscle gains given both the risk potential and the likelihood of removing emphasis away from the target muscle group.
Never forget that the success of your weight training pursuits will be based primarily on how consistent you are able to train, and using improper form will lead to injuries, forcing missed bodybuilding workout sessions, and will absolutely affect your overall muscle building progress in a negative way.