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Discuss the following dynamic exercise.
- Isotonic Training
- Variable Resistance Training
- Free Weight Training
Isotonic contraction is the force generated by a muscle while contracting, when the muscle lengthens and shortens during movement, with the force remaining constant. Therefore, when picking up a glass to take a drink your muscles would use the same force throughout the movement up and down, which is nearly impossible. During normal muscle contraction the force varies throughout the movement. A more accurate term is dynamic contraction, meaning the muscle tension varies as it moves the glass. Common exercises demonstrating this type of contraction are dumbbell curls, squats, lunges and walking. These forms of exercises help to isolate certain muscle groups, as in the case of dumbbell curls during which the primary muscle worked is the bicep
FREE Weight training
IS a common type of strength training for developing the strength and size of skeletal muscles. It uses the weight force of gravity (in the form of weighted bars, dumbbells or weight stacks) to oppose the force generated by muscle through concentric or eccentric contraction. Weight training uses a variety of specialized equipment to target specific muscle groups and types of movement.
Sports where strength training is central are bodybuilding, weightlifting, power lifting, and strongman, Highland games, shotput, discus throw, and javelin throw. Many other sports use strength training as part of their training regimen, notably; mixed martial arts, American football, wrestling, rugby football, track and field, rowing, lacrosse, basketball, baseball and hockey. Strength training for other sports and physical activities is becoming increasingly popular.
Variable Resistance Training
Variable Resistance Training (VRT), sometimes called accommodating resistance, is a type of training that I’ve been interested in for a while now, and which has been a part of the power lifting community for even longer. VRT is what you’re seeing when a lifter adds elastic bands or chains to the bar before a lift. This has the effect of increasing the resistance toward the end of the concentric phase of the lift.VRT is a relatively new aspect of training, and as such has not been well studied. The basis of its effects and effectiveness are largely anecdotal. In a recent study in the researchers sought to learn more about the effectiveness of VRT and how much resistance works the best.
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