Resistance training is a category of exercise where one utilizes a tool, a piece of equipment or one’s own weight to apply a force to the body that stresses segments of the body or the entire body with a goal of stimulating reactive increased muscle mass and strength, bone strength and stamina, postural support, balance, symmetry and performance with additional cardiovascular, weight control and health benefits (2).
The scientific underpinning for RT involves two physical laws of anatomy and physiology. Wolff’s Law of Bone Adaptation and Davis’s Law of Soft Tissue Adaptation. Both Laws govern the dynamic system of adaptation and compensation that exists when there is g-Force and/or elastic resistance force in play.
Joseph Wolff’s Law of Bone (2-3) states that bone will adapt to the loads under which it is placed. If loading on a particular bone increases, the bone will remodel itself over time to become stronger in order to manage that load. The inverse is true as well: if the loading on a bone decreases, the bone will become less dense and weaker due to the lack of the stimulus required for continued dynamic remodeling.
Henry Davis’s Law of Soft Tissue Adaptation (4-5) states that muscle, tendon, ligaments, fascia or any soft tissue down to single cells when put under even a moderate degree of unremitting tension, pressure or weight react by increasing in mass or strength and change form (lengthen) in order to manage the stimulating force. The inverse is true as well: on the when soft tissues or even single cells remain uninterruptedly in a state of reduced stress or forces, they will gradually reduce in mass or strength and change form (shorten) in order to adapt to the reduced force.