Author: Glossary

  • Reversibility

    This principle states that the body will gradually revert to pretraining status when you do not exercise. The ability to mentally perform and retrace an action or transformation, operations.  

  • Retraction

    Backward movement of the shoulder girdle toward the spine. Adduction of the scapula. The fact of moving backwards or becoming shorter. Act of pulling, holding, or drawing a part back, as during surgery. The permanent shortening of the muscle fibers of the womb wall that occurs each time they contract during labor. A shortening; the…

  • Resting heart rate (HRrest)

    The heart rate after being at rest for an extended period of time. A true resting heart rate is found by taking the heart rate for 60 seconds on three mornings before rising and averaging the three. Pulse while still lying down in the morning before arising. The number of heartbeats per minute while the…

  • Respiratory system

    Made up of the lungs and a series of passageways leading into and out of the lungs. The lungs and related structures. The series of organs and passages which take air into the lungs, and exchange oxygen for carbon dioxide. The system of breathing apparatus including the nose, pharynx, larynx, tonsils, bronchi, and lungs. The…

  • Resisted movement

    Resisted movement refers to any part in the range of motion of an exercise movement in which additional resistive force is created by moving a load against the forces of gravity or buoyancy. The additional resistance force can also be created by the properties or mechanics of an apparatus or particular piece of equipment.  

  • Reproductive system

    Includes organs that produce, store, and transport reproductive cells. The body system that consists of all the organs concerned with reproduction. The arrangement of organs and ducts in the bodies of men and women which produce spermatozoa or ova. Organs and tissues involved in the production and maturation of gametes and in their union and…

  • Release form

    A form that essentially removes a real or potential liability for the other party in the agreement. For example, by signing the release form or waiver of liability, a participant assumes the risk associated with participation in an exercise program.  

  • Relaxation cue

    Cue to elicit the perception of a comfortable exercise environment.  

  • Relative velocity

    The speed to one object as measured in respect to the speed of another object.  

  • Registered dietician

    According to the American Dietetic Association, “a food and nutrition expert who has met the minimum academic and professional requirements to qualify for the credential RD.” A food and nutrition expert who has completed the academic and practice requirements established by the Commission on Dietetic Registration, the credentialing agency of the American Dietetic Association. A…