Ice-Heat Therapy: Ice is your first line of defense against injury. Heat is the second component. Heat will soften your tightened muscle and cause blood to flush the area. This enhances oxygen and nutrient delivery to your deprived and tightened muscle.
Idiopathic: Think of the word “idiot” on this one. Doctors often say it is idiopathic which means without a known cause.
Ileum: This is the section of your small intestine between your jejunum and the beginning of your large intestine.
Iliopsoas muscles: A.K.A. hip flexor. These two muscles are located on each side of your lumbar vertebrae and are attached to them. They are on the inside of your pelvis and are connected to your thigh bones. They help you to lift your knee.
Imagery: A psychological strategy designed to help you improve your physical performance.
Infarction: The death of cells due to lack of blood. Infarction is usually preceded by lack of oxygen (ischemia).
Inflammation: Inflammation is a process that occurs in response to a range of traumas from sunburn and wounds, to infection and auto-immune conditions. Whatever the cause, the process leads to warmth, redness, swelling, and pain.
Inflammatory Bowel Disease: Ulcerative colitis and Crohn's disease are forms of inflammatory bowel disease. They bring along inflammation and sores in the large intestine. Symptoms include diarrhea, bloody stools, cramps and abdominal pain.
Insomnia: Insomnia, or sleeplessness may be caused by a variety of triggers. The key to successful treatment of insomnia is to find the cause and deal with it. Whether the cause is emotional, physical, or environmental (a snoring spouse), seek out the cause of your insomnia to uncover the cure.
Instructor Motivation: A group exercise leader can increase your motivation to burn an additional 2 calories per minute.
Insulin: A hormone produced by your pancreas. Insulin helps blood glucose (sugar) get into your cells.
Insulin-Dependent Diabetes: A.K.A. Type I or Juvenile onset diabetes. It usually appears before age 35. People with diabetes need insulin injections because their bodies have stopped producing it.
Intensity: How hard you work out.
Internal Obliques: Your internal obliques are beneath your external obliques. They form the shape of a roof top. Your right internal oblique turns you to the right. And your left internal oblique turns you to the left.
Intervertebral disk: A.K.A. the shock absorbers of your spine. They are small, energy-absorbing, sponge-like cushions located between the vertebrae of your spine.
Iris: Your iris shows whether you have brown, green, or blue eyes. It is the colored ring in front of your lens that controls the size of the pupil and how much light enters gets in.
Irritable Bowel Syndrome: There are a variety symptoms that can occur in this condition. They may include abdominal distress, erratic frequency of bowel movements, bloating, flatulence, and variability in stool consistency.
Ischemia: A dangerous decrease in the supply of blood to tissue. Ischemia is usually caused by atherosclerotic narrowing of the vessel.
Isokinetic: A cybex type of weight machine that uses a constant resistance as it takes your muscle through a full range of motion. These machines may be used for training, rehabilitation, and testing.
Isometric: Pushing against an immovable object. Your muscles contract but there is no movement.
Isotonic: Free weight training. Hoisting weights where the resistance remains the same, but gravity makes the exercises easier or more difficult through different ranges of motion.
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