Type of Training & Endurance Performance

Interval training is a concept and a practice wherein a person works out at a medium to high intensity for a specified period of time or distance and then reduces the exercise intensity for an equal period of time or distance. Such an exercise regimen several sets at varying levels of exercise intensity. Advocates of interval training contend that the greatest changes in body physiology occur during the high intensity intervals, as the body responds to the applied stress. The increased physiological benefits that result from the high intensity exercise intervals produce training benefits equal to those produced by a steady or continuous lower-intensity training session that extends over a much longer time period than is required in an interval training session (21). A 1997 study found, however, that no increased benefits accrued from higher intensity training at intervals (1). This debate holds relevance for both high-performance athletes and ordinary people desiring to maintain acceptable levels of fitness.

A 1997 study found that splitting training tasks into intervals or repetitions will increase the amount of oxygen consumed and needed to be repaid after each unit when compared to performing the same distance at the same workload in a continuous or steady exercise regimen. Intermittent, or interval, training tasks were found to place a greater load on the oxygen transport system than do continuous tasks (1). The response to exercise con

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the process of contraction, neither the thick nor the thin filaments change in length. All of the change in the length of the muscle is accounted for by a greater or lesser degree of overlap between the thick and thin filaments. Thus, when a muscle shortens, the length of the A-band stays the same while that of the I-band decreases. The thin filaments themselves do not change length. Shortening of the muscle is brought about a cyclic motion of the crossbridges, "in which they successively attach to the closest available thin filament site, change their shape, then let go of the actin and re-attach further along" (18:539). Hundreds of sarcomeres connected in series (end-to-end) form a functional unit referred to as a myofibril, which runs for the length of the cell. Most muscle cells contain a large number of parallel myofibrils and the intracellular spaces between them are filled by mitochondria and by molecules of glycogen, which is a source of chemical energy. Space between myofibrils also is filled by the internal membrane system (18). Structure of Myofilaments Thick filaments are made up of a large protein named myosin. A thick filament is composed of between 300 and 400 myosin molecules. Each myosin molecule has a

Category: Medical - T