TikTok user emilyrobinson29 shared a video in which she and a friend can be seen on a slingshot ride.

In the clip, Emily’s friend can be seen crying as they brace while waiting for the amusement park ride to begin.

As the pair fly into the air, Emily’s friend can be seen briefly fainting on a number of occasions, with her arms flailing around at times.

Emily can then be seen helping her friend by checking in on her in a bid to help her regain consciousness.

Dr. Jim Keany, an ER doctor at Providence Mission Hospital in Southern California, told Newsweek the clinical name for fainting when your body’s normal ability to control blood pressure doesn’t work like it should is vasovagal syncope.

He added that peoples’ blood pressure is controlled by the body’s nervous system and that the vagus nerve sends signals affecting blood vessels around the body.

The g-forces of a roller coaster or other similar rides can overwhelm the system and cause a person to pass out.

While most healthy people suffer no long-lasting effects from brief fainting, Keany said: “For people with heart conditions, or those already at risk for a heart attack or stroke, the stress on the heart from fainting could theoretically induce a heart attack.

Since being shared on November 15, the video has been seen more than 1.9 million times.

Many of those who commented on the video identified with the TikTok user and also praised her for checking on her friend.

TikTok user G said: “When she rised from dead to scream. I’m crying.”

MeltdownMomma added: “What a sweet friend, kept checking in.”

Zoom zoom posted: “OK but I shed a tear watching this because I 10,000 percent would cry with fear like this. You did amazing girl.”

“When unconscious, you lose the ability to control your body,” Keany said. “If you have orthopedic or other injuries, those could be made worse as your body flops around within the ride restraints, outside your control.”

Keany said that people with heart conditions, high blood pressure, high stroke risk, and orthopedic injuries should avoid amusement park rides.

“The stress on the body produced by the g-forces can make all of these conditions worse. Also, afterwards, the body will react with a fight-or-flight type adrenaline rush.

“This can increase blood pressure and pulse, putting those individuals at risk even after the ride is over. As mentioned earlier, certain medications actually blunt the body’s ability to compensate for the affects of g-forces on blood flow. If you are on any heart or blood pressure medications, you should consult your doctor.”

Newsweek has contacted user emilyrobinson29 for comment.