Which of the following is an example of a postural steadiness test?

The Romberg test is an example of a postural steadiness test because it specifically evaluates an individual's ability to maintain balance under conditions that challenge their postural control. During the Romberg test, a person stands with their feet together and eyes closed, which disrupts their visual input, forcing them to rely primarily on proprioceptive and vestibular systems to maintain balance. This test helps assess stability and the body's ability to control posture when sensory information is altered.

In contrast, the other tests listed evaluate different physical capabilities. The push-up test measures upper body strength, focusing on muscular endurance. The vertical jump test gauges explosive leg power and strength, while the treadmill endurance test assesses cardiovascular fitness and stamina. Each of these tests has its unique focus, distancing them from evaluating postural steadiness specifically.