"In addition to our serious concern about the incident itself, we were also disturbed that the report to the use of force committee responsible for reviewing the incident did not disclose the use of either the body belt or the hood."
HMP Bullingdon is a category C training prison which also serves courts in Oxfordshire and Berkshire. Staff at the prison used force 74 times between January and June 2012, compared with 102 times in the same period last year, the report said.
Inspectors said they heard "repeated concerns from a variety of sources about the behaviour of a very small minority of officers" and prisoners had little confidence in the system for making complaints about staff.
Nick Hardwick, chief inspector of prisons, said exceptions to a generally positive picture were relatively few but were "very serious and undermined the work of the prison as a whole", saying they needed to be addressed as a matter of urgency.
Andrew Neilson, director of campaigns at the Howard League for Penal Reform, said: "We would hope this incident was an aberration as the use of force by staff should always be carefully managed and used only in exceptional circumstances. While there are positive aspects to Bullingdon's latest inspection report, there are some issues of serious concern which prison managers need to address."