the athlete's initially low leg power ability can be
significantly improved.
Resistance band excercise is an exercise
modality tool consisting of two straps and a handle
that uses its own body weight as a burden.
Resistance band suspension training system
determines the effects of exercise on physiological
metabolic indexes of body performance and
intensity. Resistance bands strengthen body muscles,
strengthen joint stability, strengthen ligaments, and
stabilize a group of muscles. The nature of the
spring makes the resistance band helps the process
of muscle formation more leverage. When stretching
the rope, the muscles of the hands, abdomen, and
legs will begin to contract. It increases strength in
the bones and muscles, so that the body can be
firmer, with increasing muscle strength, the speed is
also increasing. This also increases in speed is
caused when using movements of resistance bands is
done quickly and repeatedly. Resistance training is
an exercise program that causes muscles to contract
against external loads in hopes of increasing
endurance, strength and muscle mass (Mahardika,
2017).
Uchida (2016) found that the elastic band has a
different tension force on 8 colors owned by the
elastic band. The different durability of each color is
measured at 10 elongations whose initial distance is
0.3 meters and the maximum stretch distance is 1.05
meters with the results displayed in kilogram-force
(kgf). The results of this study indicated that the
greater the level of stretching in the elastic band, the
greater the increase in tension force.
Resistance exercise is an important element in
rehabilitation programs for someone who has
functional disorders and integral components and
has the potential to improve motor work ability, and
prevent or reduce the risk of illness and injury (Yu et
al., 2013). This exercise is active and is carried out 3
times a week for maximum results (Princeton in
Magdalena, 2017).
Resistance exercise can also increase flexibility,
joint ROM, and stimulate proprioceptive increases
because strengthening exercises will increase the
activities of motor unit recruits that will activate the
tendon of organ tendons and muscle spindles
(Brown, 2007). During training the intrafusal and
extrafusal fibers will continue to receive sensory
input, which will be sent and processed in the brain
so that it can determine the amount of muscle co-
contraction needed. Some of the responses sent will
return to extrafusal and activate golgi tendon so that
there will be improvement in coordination of
intrafusal fibers and extrafusal fibers with afferent
nerves in the muscle spindle, thus forming a good
proprioceptive (Swandari, 2015).
With 8 weeks of treatment time can increase
because training provided systematically,
progressively, and repeatedly will improve the
body's organ systems so that physical appearance
will be optimal. The training, which is carried out
with a frequency of three times a week, is suitable
for beginners and will result in significant
improvements. Physical training, which is applied
regularly and measured with sufficient amount and
time, will cause changes in the ability to produce
greater energy and improve physical appearance.
Movements made during repetitive exercises will
cause the formation of conditional reflexes, learning
to move, and the process of memorization of motion
(Nala, 2011: 39).
This is because elastic band exercise will
improve neuromuscular function and can also cause
post-activation potentiation, which is a temporary
increase in muscle work that is a result of previous
contractions. Improved performance through bridge
traffic will result in more cross-bridges being formed
until the production of muscle strength increases
(Behm et al., 2011 in Magdalena, 2017). Muscle
contractions that occur will increase the level of
tension (level tension) in the form of an extension of
muscle sarcomeres that cause anatomical changes,
namely an increase in the number of myofibrils, an
increase in the size of myofibrils. Together with an
increase in the size of myofibril, the enzyme system
that provides energy will also increase. This is
especially true for the increase in ATP-PC and
enzymes used for glycolysis, which allows the rapid
supply of energy during strong and brief muscle
contractions and causes biochemical changes in
muscles. Biochemical components of muscle have
increased, including creatine concentration, creatine
phosphate concentration and ATP, and glycogen.
Increased energy produced by muscles will have an
impact on increasing the ability of muscle
contraction which will further increase muscle
strength. Muscle strength will help the muscles work
optimally to form good stability so that the body can
maintain its balance during various movements
(Kisner & Colby, 2007).
Resisted exercise using elastic bands can cause
isotonic contractions or dynamic muscle
contractions where the length of the muscles
changes but the muscle tone remains the same.
During training, the body will fight the resistance of
the elastic band that stimulates so that the joint
movement is wider to be able to resist the resistance
band. The area of joint motion will cooperate with