Training for Strength vs. Training for Size

The process of muscle growth is called hypertrophy. However, based on your training, your muscles will adapt accordingly. There are two types of hypertrophy of skeletal muscle: sarcoplasmic hypertrophy and myofibrillar hypertrophy:

Bodybuilder Ronnie Coleman

1. Sarcoplasmic hypertrophy is often coined as being "aesthetic muscle." Without getting too technical, this type of hypertrophy increases the size or the volume of the muscle. Bodybuilders are often known for having this type of muscle. Usually, the training protocol to achieve "size" gains consists of 3-4 sets of 12-15 reps of any given exercise. These sets are performed at a moderately heavy weight, and the athlete rests for less than 3 minutes of rest in between each set.



Powerlifter Scott Lade

2. Myofibrillar hypertrophy is sometimes called "functional muscle." Myofibrillar hypertrophy creates a more compact, dense muscle. Typically this type of hypertrophy indicates significant gains in strength. A training protocol for strength usually calls for lower repetitions (between 1 and 6) and, depending on the goal of the athlete, between 5-10 sets. These sets are performed at the heaviest weight that the athlete can use with good form. The rest time between sets is often longer than 3 minutes. When an athlete is trying to increase strength, he or she typically looks to find a 1 repetition maximum (1 RM). This means that he or she is trying to lift as much weight as is possible with good form for 1 repetition. When developing a strength training program, he or she would likely perform multiple sets of either 3 or 5 repetitions at a percentage of that 1 repetition maximum. The idea behind this is that, in order to experience real gains in strength, you need to put your body under a heavy stimulus. Without using the heaviest loads possible, you are never going to adapt and lift heavier weights.

As you can see, Powerlifter Scott Lade and Bodybuilder Ronnie Coleman weigh nearly the same, but have very different body types. It is important to note, however, that these two types of hypertrophy go hand-in-hand. With size, you will find increased levels of strength, and with strength, you will certainly see the size of your muscles increase. Obviously, this does no mean that bodybuilders are weak, or that strong athletes cannot have big, defined muscles. This is simply meant to guide you when you are developing your own exercise regimen. If you are training more for aesthetics, aim for higher repetitions. If your primary focus is strength, stick with lower repetitions and heavier weight. By sticking to these basic guidelines, you can program a more effective training program for yourself.


Sources:

1. Poliquin, Charles. Modern Trends in Strength Training. Volume 1. QFAC Bodybuilding, 2001.
2. Siff, Mel C. and Yuri V. Verkhoshansky. Supertraining. Colorado: Denver, 1999.
3. Tsatsouline, Pavel. Power to the People. Dragon Door Publications, Inc., 2000.