Ninety per cent of jockeys used some form of rapid weight loss measure to make weight for racing with a small number reporting vomiting

A small number of Irish jockeys were using vomiting to control their weight with more than half of jockeys saying it was a constant struggle to achieve the right weight for racing.

The disclosure came in research carried out by the Irish Horseracing Regulatory Board (IHRB) ahead of moves to end the availability of saunas at racecourses.

More than 80% of jockeys wanted saunas kept open but research detailed how around 10% of jockeys are “severely dehydrated” when riding.

The records also warned of profound mental health effects from the use of rapid weight loss technique including “psychological distress, depression, anxiety, and adverse alcohol use”.

Earlier this year, the Irish Horseracing Regulatory Board (IHRB) confirmed the permanent closure of saunas with jockeys given an extra weight allowance to create a healthier working environment for them.