Patent ID: 7421293

Claim:
A stress-at work judging apparatus comprising: myoelectric potential signal input means for receiving a myoelectric potential signal from a masseter muscle of a test subject during a target work activity, the target work activity performed by exercise of muscles in an arm or leg of the test subject, not by exercise of jaws of the test subject; stress judging means for judging stress of the test subject during the target work activity from an intensity or time-varying change of the myoelectric potential signal inputted through the myoelectric potential signal input means, wherein the stress judging means excludes from a target period for stress judgment a period of work activity comprising opening and closing the jaws; and a display for displaying a result from the stress judging means, wherein the stress judging means specifies the period of work activity during which the test subject is opening and closing the jaws by recognizing voice data acquired by recording a speech of the test subject.