The effect of lifting protocol on comparisons with isoinertial lifting performance

Area of Science:

• Biomechanics
• Human movement analysis
• Exercise physiology

Background:

• Assessing maximal lifting capacity is crucial in various physical and occupational settings.
• Understanding how task constraints influence performance is essential for accurate assessment.
• Previous research has not fully explored the impact of varied lifting protocols on gender-specific outcomes.

Purpose of the Study:

• To evaluate the effect of protocol constraints on maximal box-lifting task scores.
• To investigate gender-based differences in the impact of protocol modifications.
• To determine if protocol changes alter the correlation between box-lifting and isoinertial lifting tests.

Main Methods:

• 269 participants (143 males, 126 females) underwent maximal isoinertial lifting tests on an Incremental Lifting Machine (ILM).
• Participants completed a maximal box-lifting task under three distinct protocols: set style, free style, and ergonomically redesigned.
• General linear models were employed for statistical analysis of the collected data.

Main Results:

• Protocol constraints significantly influenced lifting task scores, with score variations observed across the three protocols.
• Females exhibited greater percentage increases in task scores compared to males when protocol constraints were removed.
• Significant gender disparities were found in the correlations between box-lifting task scores and isoinertial lifting test results.

Conclusions:

• Modifications in lifting task protocols demonstrably affect performance outcomes.
• The Incremental Lifting Machine (ILM) demonstrated limitations in accurately predicting female lifting capabilities across all tested protocols.
• Gender-specific responses to lifting task constraints highlight the need for tailored assessment methods.