Therefore, in weightlifting and deadlift movements, the use of a weight belt does not increase movement speed when different absolute loads are applied; even when the same relative load is set based on maximum strength achieved with the weight belt, while the weight belt allows the trainee to lift a heavier load, it reduces the movement speed during the deadlift.
Muscular Endurance
Researchers assessed the performance-enhancing effects of weight belts on muscular endurance by comparing the number of repetitions to failure under different absolute loads and under the same absolute load. Under the same absolute load conditions for the deadlift, women with resistance training experience who used weight belts to perform failure training at 80% of their 1RM without a weight belt showed a significant increase in the number of repetitions, demonstrating a large effect size; In contrast, a study involving men found no significant difference in the number of repetitions to failure between using and not using a lifting belt during deadlifts at 90% of their 1RM with the belt (approximately 162 kg) and 90% of their 1RM without the belt (approximately 138.9 kg). This may be because the high load settings limited the assessment of muscular endurance.
Therefore, under the same absolute load, using a weight belt can increase the number of repetitions to failure; however, because weight belts provide a performance-enhancing effect on absolute strength, this condition may underestimate the percentage relative to 1RM, thereby reducing the relative intensity of the training and allowing athletes using weight belts to complete more repetitions. Nevertheless, this preliminary hypothesis requires more rigorous research to confirm.
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