KINESIOLOGY Energy Systems Anatomy Biomechanics on your mark
KINESIOLOGY Energy Systems Anatomy Biomechanics “……. on your mark”
HOME Anatomy Skeletal System Location Structure Muscular Systems Function Characteristics Running
HOME Anatomy Skeletal System Running Muscular Systems
HOME Anatomy Skeletal System Running Muscular Systems
HOME Energy Systems ATP CP LA O 2
HOME Energy Systems O 2 means aerobic running in which ATP is manufactured from food mainly sugar and fat. This system produces ATP copiously and is the prime energy source during endurance activities O 2
HOME Energy Systems CP - Creatine Phosphate: a chemical compound stored in muscle, which when broken down aids in the manufacture of ATP. The combination of ADP and CP produces ATP. CP
HOME Energy Systems LA LA - Lactic acid: a fatiguing metabolite of the lactic acid system resulting from the incomplete breakdown of glucose. However Noakes in South Africa has discovered that although excessive lactate production is part of the extreme fatigue process, it is the protons produced at the same time that restrict further performance
HOME Energy Systems ATP - Adenosine Triphosphate: a complex chemical compound formed with the energy released from food and stored in all cells, particularly muscles. Only from the energy released by the breakdown of this compound can the cells perform work. The breakdown of ATP produces energy and ADP.
HOME Biomechanics The Running Cycle No double support phase Three phases – stance (40%) – float (30%) – swing (30%) Stance consists of – contact, midstance, propulsion ‘Float’ phase – body airborne, no foot contact – consists of forward swing and foot descent “Go”
HOME Biomechanics of Running There are two phases of running: the stance phase and the swing phase. The stance phase consists of footstrike, mid-stance, and toe-off ; and the swing phase consists of follow through, hip flexion and leg descent. During an eccentric contraction, muscle fibers will slowly elongate to slow down a particular motion, while a concentric contraction involves shortening of the muscle fibers to lift an object or move a limb in a particular direction. During leg descent and foot-strike, the pelvis flexes forward and the leg extends, the hamstring muscles are eccentrically contracting to slow down both of these particular movements (Figure 4). When the eccentric load exceeds the strength of the muscle fibers, tearing of the hamstring fibers occurs, resulting in a strain injury.
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