From this definition one will be able to understand how strength training can influence metabolism. Let's take a look a each.
Muscles contracting under heavy loads require energy.
They also produce heat which is a by-product of muscular contraction. How much strength training increases metabolism will vary depending upon the amount of muscle mass involved in an exercise and the level of resistance used. Obviously a squat or leg press exercise will utilize a greater amount of muscle mass than a biceps curl exercise and consequently have a greater energy cost. The metabolic rate or energy expenditure has been estimated to vary from five to ten calories per minute, depending on whether large or small muscle groups were involved in the exercise. They found that the economy of the weight training exercise decreased as the resistance load increased.