A distinction can be made between proximal ageing (age-based effects that come about because of factors in the recent past) and distal ageing (age-based differences that can be traced back to a cause early in person's life, such as childhood poliomyelitis).
physiologic. pertaining to physiology; normal; not pathologic. physiologic saline solution (physiologic salt solution) (physiologic sodium chloride solution) a 0.9 per cent solution of sodium chloride and water; it is isotonic, i.e., of the same osmotic pressure as blood serum. It is sometimes given intravenously to replace lost sodium and chloride.
The physiologic basis of performance in aerobic sports such as distance running is aerobic work capacity. This trait is largely inherited and varies by as much as 300% between individuals, explaining the wide range of performances observed in any given road race. Exercise physiologists measure a quantity known as VO2 Max, your capacity for Oxygen uptake, aerobic energy transfer, or your aerobic horsepower. An improvement in VO2 Max increases the amount of work you can do or means that you can run faster and/or farther.