A 24-year-old Las Vegas salon worker was found dead inside a cryotherapy chamber after freezing to death late last month, prompting global media coverage questioning the safety of the devices, as well as an investigation into the therapy by Nevada state authorities.

The treatment involves exposure to sub-zero temperatures for a few minutes at a time, and is used to treat sore muscles and to improve skin. The worker allegedly used the machine by herself after hours, and was found dead in the morning.

Richard Otto, chief executive officer of US-based supplier Impact Cryotherapy, which manufactures whole body cryotherapy systems – though not the one used in the Las Vegas incident – told Spa Opportunities that cryotherapy remains safe.

“Whole body cryotherapy has been in use for over 30 years in Europe and Japan,” said Otto. “When used correctly, WBC is safe, and can be a powerful recovery tool for individuals. Proper operation of cryotherapy equipment is critical.”

Otto said that Impact Cryotherapy provides all operators with a comprehensive training programme at the customer’s location.

He suggests spa operators ensure they purchase well-made equipment and never use the equipment unattended – as the Las Vegas spa worker is believed to have done. Otto also said it’s vital to always have a trained operator conduct the cryotherapy session, and that three minutes is the maximum length session that he would recommend.

“Tragic events always raise awareness and set a tone for caution,” said Otto. “Cryotherapy is safe when used correctly by trained personnel. The results achieved by many are driving the utilisation.”