A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Imbalance

The state or condition of lacking balance. (Muscular imbalances) Lack of balance and normal symmetry within the muscular system.

Impingement

An encroachment on the space occupied by soft tissue, such as nerve or muscle. In this text, impingement refers to nerve irritation (i.e., from pressure or friction) associated with muscles.

In Vitro

Functioning outside of, or detached from the body.

In Vivo

Functioning within the body.

Innervation

Nerve stimulation of a muscle.

Internal Rotation

Rotation occurring toward midline; movement inward.

Isokinetic Exercise

Contractions performed at constant angular velocity.

Isolate-Integrate

When a weak link is identified, it may be important to emphasize the target area by isolating the joint movement. Isolated strength can then be integrated with the rest of the body.

Isometric Action

Iso = same; metric = length - The force produced by the muscle is equal and opposite to the external resistance, therefore, there is no net change in muscle length - no limb movement. (Also referred to as Static exercise)

Interstitial

The space within an organ.

Ipsilateral

The same side of the body.

Isolation

Normally defined as a single joint motion. It is important to remember that one cannot isolate a muscle while resistance training. For example, immediately following a load application, the stabilizer muscles become partially involved, due to the machine's assistance. The outside assistance (machine) helps the body or specific joint(s) to remain stable while the prime movers cope with the load. Although we cannot isolate muscles, we can use certain machines to isolate a joint(s), which will emphasize a target area.

Isotonic Exercise

Exercise involving constant muscle contraction.

regardless if produced by stretch or contraction. When stimulated, will cause an inhibition of the agonist and facilitation of the antagonist.