Mindblown: a blog about philosophy.
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Sliding-filament theory of muscle contraction
The theory that explains muscle contraction as the result of myofilaments sliding over each other.
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Skinfolds
The double thickness of the skin plus the adipose tissue between the parallel layers of the skin. A method used to evaluate body composition by measuring the thickness of a fold of skin and the underlying layer of fat located just beneath the surface of the skin. This approach is commonly employed to assess the…
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Sarcoplasmic reticulum (SR)
The specialized muscle cell organelle that stores and releases calcium. A network in the cytoplasm of striated muscle fibres. Network of tubules and sacs that function in muscle contraction and relaxation. An arrangement of membranous vesicles and tubules found in the cytoplasm of striated muscle fibers. The sarcoplasmic reticulum plays an important role in the…
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Resting metabolic rate (RMR)
The energy expended while an individual is resting quietly in a supine position. The total amount of energy your body uses in a given period of time when at rest. RMR depends on body size, body composition, age, and other factors and can be temporarily affected by activity level and diet. The metabolism that occurs…
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Respiratory exchange ratio (RER)
Ratio of the volume of CO2 produced to the volume of O2, consumed in the body as a whole. The respiratory exchange ratio is assessed through assessment of expired gases as the volume of carbon dioxide produced divided by the volume of oxygen consumed. RER provides an indication of the respiratory quotient (RQ), which describes…
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One inspiration and expiration.
One inspiration and expiration.
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Resistance vessels
Another name for arterioles, because this is the site of greatest resistance to blood flow in the vascular system.
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Resistance training
A systematic program of exercises involving the exertion of force against a load, used to develop the strength, endurance, and/or hypertrophy of the muscular system.
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Relative submaximal workload
A workload above resting but below maximum that is prorated to each individual; typically set as some percentage of maximum.
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Reflex
Rapid, involuntary response to stimuli in which a specific stimulus results in a specific motor response. An automatic, unlearned response that occurs without conscious effort. A physiological reaction without any conscious thought involved, e.g. a knee jerk or a sneeze, which happens in response to a particular stimulus. An involuntary, automatic movement in reaction to…
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