The 'Liftest' strength test-an accurate method of dynamic strength assessment?

A technique for the assessment of individual dynamic strength and lifting capacity, known as 'Liftest', has been devised and tested in the USA by Kroemer. We sought to confirm, or otherwise, his estimates of the reliability of the test within sessions, and the applicability of the test in a heavy industry (coal mining). The coefficient of variation for maximal overhead lifts from a height of 24 cm by 19 healthy miners was 2·6% (c.f. Kroemer' s value of 3·2% for males), with a mean load of 48·1 kg. A psychophysically acceptable overhead lift, at a frequency of one a minute for a working day, was less reliable. All subjects, except one, were capable of loads in excess of Kroemer's recommended safe maximum for lifts to knuckle height. There was no problem with systematic errors, i.e. fatigue or a learning effect. We concluded that 'Liftest' was a reliable means of dynamic strength assessment for the overhead-reach lift.