In this study, we designed and manufactured a treadmill capable of restraining
walking by providing a sudden repulsive force on the left and right legs of
a pedestrian when walking for the fall prevention training of the elderly.

Through this, it is possible for the elderly person to strengthen the lower extremity
muscles to prevent and prepare for falling through the fall prevention training similar to
the fall environment that may occur in daily life.

The development system includes a motor for generating a driving force in the form of
a left and a right driving system and a belt separated from each other,
an electromagnetic clutch for rapidly stopping the running belt of the motor transmitted
to the running belt to stop the running belt, And a controller for controlling the driver.

In order to evaluate the development system,
the motor driving ability test and the power transmission, connection and shut-off performance
of the electromagnetic clutch were carried out.

The subject 's muscle activity of the lower extremity muscles was evaluated when the running belt
was stopped at the beginning of the right folding.

It is expected that the developed dual function system will be helpful for the fall prevention exercise
as well as the rehabilitation exercise for patients who have recovered from surgery or hemiplegic patients.

Compared to healthy young adults, elderly people are relatively weaker in basic physical functions
such as maxillary strength, postural balance ability, and cognitive function. This has led to the weakening
of the gait behavior of the elderly.

The weakening of the ab ility of the elderly to perform the gait is becoming a major cause of the increase
in the frequency of falls in the elderly.

Falling accidents in the elderly can lead to fractures of the pelvis and major joints, which transform
the user's daily life from " standing" to "lying".

Daily living in 'lying' can limit social activities for the elderly and cause other complications, leading to even death.
It has been reported that falls occur more frequently in the elderly than 65 years of age, and more than 90% of the
causes of hip fractures are reported to be caused by falls Various types of gait related systems have been studied
to prevent falls in the elderly.

Training methods for walking exercise are divided into treadmill walking method and
ground walking me thod.

The treadmill walking method is a gait training method in which a user provides a real gait operation in a local place
by using a mechanical device such as a treadmill.

The floor walking method is a gait training method in which users walk
on the indoor corridor in clinical institutes such as hospitals.

In some study, they developed a fracture prevention system that can occur
in the hip joint during the fall, by analyzing the main cause of the fracture leading to death.

This is a system that can prevent the fracture by detecting the accurate
fall time by measuring the body movement using the wireless module.

The previous studies show that most of them are rehabilitation systems
for training the simple walking process or systems for preventing the fractures that occur during the fall.

In order to prevent the fall of the elderly person,
it is necessary to apply a training system to strengthen the muscles and joints.

In this study, we aim to develop a fall prevention training system
for the elderly by using a split treadmill with left and right belts.

Also, we developed a powertrain system using an electromagnetic clutch,
and developed a controller and a control algorithm to control it.

For evaluating the muscle strengthening effect on the gait prevention training function,
we estimated the muscular activities of lower limbs between normal walking and fall training walking.