isometric contractions การใช้

• Soreness can theoretically be avoided by limiting exercise to concentric and isometric contractions.
• During isometric contractions the series elastic component is under tension and therefore is stretched a finite amount.
• This is tested by determining the recruitment threshold of a motor unit during isometric contraction in which the force is gradually increased.
• The patient's restricted muscle is put in a position of stretch followed by an isometric contraction of the restricted muscle.
• Pushing is an active process that, assuming the wall does not move, produces an isometric contraction in muscles doing the pushing.
• The knee extensors of healthy old adults fatigue less during isometric contractions than do those of young adults who had similar levels of habitual physical activity.
• The mechanisms controlling fatigue in the elderly during isometric contractions are not the same as those that influence fatigue during dynamic contractions, while young adults keep the same strategy.
• Similarly, Akima et al . were able to maintain isometric peak torque in subjects who performed daily maximal isometric contractions of the knee extensors during 20 days of bed rest.
• At this rope length the skier's body is experiencing intense isometric contractions and extreme upper body torque with loads of up to 600 kg as they begin accelerating after rounding a turn buoy.
• Most isometric contractions in PNF stretching techniques should be held for a minimum of 3 seconds at a sub maximal effort ( 20-50 % of maximal effort ) to avoid muscle fatigue and injury.
• An eccentric contraction is one of the three distinct phases in the movement of muscles and tendons, the other two are an isometric contraction ( no movement ), and a concentric contraction ( contracting ).
• In the case of fatigue in a 30-second isometric contraction, the first window may be the first second, the second window might be at second 15, and the third window could be the last second of contraction ( at second 30 ).
• "' Contract Relax Agonist ( Antagonist ) Contract ( CRAC ) "'is usually performed by a passive or active stretch of the target muscle ( s ) to move the limb into a starting position at first, followed by a sub-maximal isometric contraction of the target muscle and finally an active stretch is used to move the limb into a new greater position.