| stress, mechanical | A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area. (12 Dec 1998) |
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| stress, psychological | Stress wherein emotional factors predominate. (12 Dec 1998) |
| stress reaction | An acute emotional reaction related to extreme environmental stress. Synonym: acute situational reaction. (05 Mar 2000) |
| stress riser | A mechanical defect, such as a hole, in bone or other materials that concentrates stress in the area. (05 Mar 2000) |
| stress shielding | Osteopenia occurring in bone as the result of removal of normal stress from the bone by an implant. (05 Mar 2000) |
| stress-strain curve | A curve showing the ratio of deformation to load during the testing of a material in tension. (05 Mar 2000) |
| stress test | Any cardiac challenge, physical, pharmacologic, or mental delivered under monitored conditions. Most commonly this is exercise, the most common monitor being electrocardiography although any other graphic technique, including cardiac catheterization, may be applied. (05 Mar 2000) |
| stress ulcers | An ulcer of the duodenum in a patient with extensive superficial burns, intracranial lesions, or severe bodily injury. Synonym: stress ulcers. (05 Mar 2000) |
| stress urinary incontinence | Leakage of urine as a result of coughing, straining, or some sudden voluntary movement, due to weakness of the fascia muscles and at the neck of the bladder. Synonym: urinary exertional incontinence. (05 Mar 2000) |
| dental stress analysis | The description and measurement of the various factors that produce physical stress upon dental restorations, prostheses, or appliances, materials associated with them, or the natural oral structures. (12 Dec 1998) |
| idiomuscular contraction | A localised contraction of a degenerating muscle, occurring at the point of a sharp blow, independent of the nerve supply. Synonym: idiomuscular contraction, mounding, myoidema. Origin: myo-+ G. Oidema, swelling (05 Mar 2000) |
| isometric contraction | Muscular contractions characterised by increase in tension without change in length. (12 Dec 1998) |
| isometric contraction period | The time between closure of the atrioventricular valves and opening of the semilunar valves. (05 Mar 2000) |
| isotonic contraction | Contraction of a muscle, the tension remaining constant. Since the contractile force is proportional to the overlap of the filaments and the overlap is varying, the numbers of active cross bridges must be changing. (18 Nov 1997) |
| opening contraction | A contraction produced at the time of opening the circuit when using direct current to stimulate the muscle or a motor nerve. (05 Mar 2000) |