Sep 2010

Trained individuals have higher VO2 values at a given relative intensity compared to the untrained. Therefore, the trained have the capacity to rely more on aerobic metabolism at higher intensities. Lactate threshold represents the intensity at which blood lactate rises 1.0 mM above resting level.  This is indicative of a break from steady-state as rate of...

Sep 2010

During steady-state, energy supply is evenly matched with energy demand.  Stable VO2, heart rate, systolic blood pressure, and blood lactate concentration are indicative of steady-state. If the ATP requirement of the activity is below the muscle cell’s maximal capacity for aerobic metabolism, a steady-state concentration of ADP is attained at which the rate...

Sep 2010

The following is a brief description of the acute and adaptive pulmonary responses to exercise. Pulmonary ventilation is the first step in the oxygen delivery process.  Respiration also serves to expel carbon dioxide and regulate the body’s acid-base status.  At rest and during low intensity exercise, ventilation increases steadily with oxygen...

Sep 2010

Adenosine triphosphate (ATP) is stored in limited quantities in skeletal muscle.  When exercise begins ATP stores diminish rapidly as ATP is hydrolyzed at the actin-myosin cross-bridges, producing adenosine diphosphate (ADP) and inorganic phosphate (Pi). ATP     →     ADP + AMP reaction proceeds via ATPase Subsequently, a series of ATP-generating...