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Radiation-Electromagnetic waves.
Radioactive iodine-Iodine that gives off radiation, often used for thyroid testing.
Range Of Motion-Movement of joints.  The degree of motion allowed at a specific joint.
Rapport-The development of a relationship based on mutual trust and harmony.
Receptor (homeostatic control mechanism)-Monitors and responds to changes in the environment.
Reciprocal Inhibition-The effect that occurs when a muscle contracts, obliging its antagonist to relax in order to allow normal movement to take place.
Reclining-Face up with a back-rest to prop up torso.
Recommended Dietary Allowance (RDA)-The levels of intake of essential nutrients that, on the basis of scientific knowledge, are judged by the Food and Nutrition Board to be adequate to meet the known nutrient needs of practically all healthy persons.
Recovery Heart Rate-The heart rate response at the cessation of exercise. An indication of fitness levels; higher fitness levels will produce a rapid drop in heart rate post exercise due to heart and lung efficiency.
Recovery Massage-Massage structured primarily for the uninjured athlete who wants to recover from a strenuous workout or competition.
Recurrent-Returning at intervals or happening time after time.
Referred pain-Pain felt in a region of the body distant from site of tissue damage or injury.
Reflex-An involuntary response to a stimulus. Reflexes are specific, predictable, adaptive, and purposeful.
Reflexive Methods-Massage techniques that stimulate the nervous system, the endocrine system, and the chemicals of the body. Reflexive methods work by stimulating the nervous system (sensory neurons), and tissue changes occur in response to the body's adaptation to the neural stimulation.
Reflexology-A massage system directed primarily toward the feet and hands.
Refractory Period-The period after a muscle contraction during which the muscle is unable to contract again.
Registered Dietitian (RD)-A nutrition expert who is a reliable source of nutrition information on food and health. A registered dietitian must complete at least four years of college from an accredited college/university, complete a supervised internship and pass an extensive national exam.
Rehabilitation-The treatment and education process to restore maximum function resulting from a disease or injury.
Rehabilitation Massage-Massage used for severe injury or as part of intervention after surgery.
Relaxation Phase-The stage of exercise when the muscles are no longer contracting.
Remedial Massage - Massage used for minor to moderate injuries.
Renal-Pertaining to the kidney.
Repetition (Rep)-The number of times a specific exercise is performed within a set. (e.g. 10 pushups without rest)
Replicate-To make a copy.
Reproduce-To produce offspring.
Reproductive System-Responsible for the production of offspring.
Resisted Movement-Client attempts to move while you resist the movement.
Resourceful Compensation-Adjustments made by the body to manage a permanent or chronic dysfunction.
Respiratory System-Keeps the blood constantly supplied with oxygen and removes carbon dioxide.
Resting Heart Rate (RHR)-The number of times the heart beats each minute while the body is at rest.
Retinopathy-Disease of the structure of the eye called the retina, the light-sensitive layer of the eye.
Retraction-The act or condition of drawing back (e.g. squeezing the shoulder blades together). Opposite of protraction.
Retropatellar Pain Syndrome-Pain behind the patella (kneecap) caused by overuse or trauma. The condition may progress to Chondromalacia Patella.
Rheumatoid Arthritis-An autoimmune disease causing inflammation of the connective tissue, particularly the membranes that line the joints. The inflamed joints are painful, swollen and warm to the touch. The wrists and knuckles are most commonly affected.
Rhythm-A recurring pattern of movement with a specific cadence, beat, or accent.
R I C E-Immediate injury treatment consisting of:  1)  Rest  2)  ice  3)  compression  4)  elevation.
Rickets-Osteomalacia  
Risk Factor-A clearly defined occurrence or characteristic that has been associated with the increased rate of a subsequently occurring disease.
Rocking-Rhythmic movement of the body.
Rotation-Movement of a joint around its own axis.