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Recognition of Maximal Lift Capacity using the Polylift

A R T I C L E I N F O A B S T R A C T Article history: Received: 02 November, 2020 Accepted: 26 December, 2020 Online: 15 January, 2021 Background: Occupational injuries are an issue of huge significance in the United States. After a work injury, health care providers often utilize functional capacity evaluations to determine readiness of a patient to return to work. However, it can be difficult to determine if a patient is providing maximal “effort” during the evaluation. The aim of this study was to determine if the use of the Polylift could assist in recognizing when a subject reached maximal lift capacity of a manual lift from waist to shoulder. The Polylift is a computerized data collection instrument that measures velocity, acceleration, distance, time, and force during lifting activities. Subjects: 42 healthy college students (20males, 22females) ages 20-27. Methods: Participants first performed repeated lifts from waist to shoulder until fatigue and the number of repetitions was noted. Using this information, Brzycki’s 1 Repetition Maximum (1RM) formula was used to predict each subject’s maximal load. Next, the Polylift recorded information during four lifts (25% of 1RM, 50% of 1RM, 75% of 1RM and 100% of 1RM). Results: The Polylift recorded a consistent, significant relationship between time and acceleration. As loads approached subjects 1RM, time required to lift the weight increased, and acceleration decreased in a predictable pattern. Conclusion: The Polylift assisted researchers in determining when a subject reached maximal lift capacity by demonstrating a significant decrease in acceleration and increase in time with progressively increasing loads.