Straining against the straps
A strap was a kind of restraint that curbed an individual's movements for their own safety.
In 2151, Doctor Phlox urged sickbay patient Bu'kaH not to push against the straps holding her down, as she might hurt herself. (ENT: "Sleeping Dogs")
In 2268, several dead crewmembers were found strapped to their beds in the USS Defiant's sickbay after going into interphase. Later, several USS Enterprise crewmembers were also strapped down after they went insane due to the effects of interphase. (TOS: "The Tholian Web")