United States Sports Academy
America's Sports University®

The Sport Digest - ISSN: 1558-6448

The SAID Principle & Aerobic/Anaerobic Training

There are many basic principles of physical training an athlete must utilize for optimal results within their training program. The SAID Principle, the principle of specific adaptations to imposed demands is the foundation for sport specific training. Specific adaptations are known to take place in the human body in response to specific types of stimuli. The SAID Principle is the bases for physiological changes due to the imposed demands of the specific training stimuli.

An athlete must design a training program in order to meet the needs of their specific sport. Specific adaptations observed in athletes are directly related to the quality and specificity of the aerobic & anaerobic stimulus within their training programs. Optimal adaptations reflect careful planning, implementing and performance of conditioning and strength programs. Other factors like the athletes’ age, sex, nutrition, motivation and prior fitness level prior to training can also have an impact on training adaptations.

Below is a list of specific adaptations that are acquired due to the imposed demands of aerobic & anaerobic training. Athletes should keep these in mind when creating a sports specific training program.


Body Composition

Muscle Fiber

Bone & Connective Tissue

Metabolic Energy Stores

Enzyme Activity


Baechle, T.R. & Earle, R.W. (2000). Editors, 2 nd Ed. Essentials of Strength Training and Conditioning. NSCA-National Strength & Conditioning Association. Champaign, IL: Human Kinetics.

Foran, B. (2001). Editor. High-Performance Sports Conditioning. Modern Training for Ultimate Athletic Development. Champaign, IL: Human Kinetics.

Ward, R. & Ward, P. (1991). Encyclopedia of Weight Training. Understanding the Scientific, Theoretical and Practical Basis of Weight Training. Laguna Hills, CA: QPT Publications.