For Better Muscle Tone Lift Heavier Weights?

I had always thought that when it came to weightlifting, more reps at a lighter weight was the way to go if I was looking for muscle tone. And if I wanted to increase muscle mass then heavier weights with fewer reps was the answer. Not so, according to a new study. Yesterday's New York Times reports:
For people who lift weights to tone up and slim down, experts say, a regimen that includes a combination of challenging weights and fewer repetitions can help significantly. In a 2002 study, for example, scientists looked at what happened when women performed various resistance exercises at different weights and repetitions (85 percent of their maximum ability for 8 reps, versus 45 percent for 15). Subjects lifting more weight fewer times burned more energy and had a greater metabolic boost after exercise.

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