Very important during times of limited oxygen availability Only occur for a short period of time (2-3 minutes) Some lactic acid can diffuse out of the cell; the rest can cause short-term (a day or two) muscle pain Anaerobic respiration is limited by depletion of glucose and buildup of lactic acid
During resting activities & long term exercise (long distance running) fatty acids are used primarily for ATP production
After a person dies ATP is not available, the cross bridges that are formed are not released, causing the muscle to become rigid.
3 phases to muscle twitch 1. Lag Phase 2. Contraction Phase 3. Relaxation Phase
Results when ATP is used faster than can be produced and lactic acid builds up faster than can be removed ATP levels can fall too low for muscle cells to produce the maximum force of contraction During extreme fatigue muscles may not be able to contract or relax; Physiological Contracture Most common type of fatigue is psychological; perception of central nervous system
After intense exercise respiration rates & volume remain elevated Pays back oxygen debt that occurred during activity Converts lactic acid to glucose Replenish depleted ATP and creatine phosphate stores Replenish oxygen stores in lungs, blood and muscles Magnitude of oxygen debt depends on the intensity & length of time of exercise and the physical condition of the person Exercise and training improves the ability to carry out both aerobic and anaerobic respiration
Isometric Isotonic Concentric Eccentric