Lifting lighter weights with higher repetitions can be as beneficial as
lifting heavy weights with lower repetitions. Young men and women who
lifted lighter weights until failure were equally effective at
stimulating muscle proteins and muscle growth as their peers who lifted
heavier weights with few repetitions. These findings and hypothesis-es are
also significant when considering the stress and fatigue that heavy
weight lifting causes towards joints and tendons. Also, lifting lighter
weights until the point of fatigue can cause the body's muscle building
response to occur for a greater amount of days.
http://www.sciencedaily.com/releases/2012/04/120426110252.htm
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