 The anaerobic energy system provides energy in the absence of Oxygen.  This is used in the first few minutes of all exercise, before there is sufficient oxygen available at the muscles for aerobic metabolism.

 It is also used for fast, powerful bursts of energy, for which the aerobic system is insufficient. 1. ATP-CP 2. Glycolysis

 Rapid chemical reaction in muscle fiber itself, and doesn’t require the breakdown of food nutrients  Very short duration (ex. Sprinting)

 Partial breakdown of glucose  Delivers FOUR times as much ATP then ATP-CP  Medium duration activities  If oxygen is present then leads to aerobic system

 The aerobic system produces the largest amounts of energy, although at the lowest intensity.

 At the start of exercise the body cannot deliver oxygen to the muscles fast enough to initiate the complex chemical reactions which occur during aerobic metabolism. Therefore the body relies on anaerobic processes for the first couple of minutes.

 Requires oxygen to be present  Breakdown of food nutrients to produce energy  Used for long duration exercise at a steady pace  Deep breathing is a sign that you are in the aerobic system

 Formed when glucose isn’t broken down fast enough to keep up with energy demands  Within 2-3 minutes of intense exercise  Causes muscle pain