When people used straps to hold the bar while pulling hard on a machine, they could pull harder than when they held it with their hands alone.
Scientific Claim
Use of lifting straps was associated with higher isometric mid-thigh pull performance in healthy young males, with a statistically significant increase (p=0.001) observed in a sample of 20 males aged 20.8 ± 1.5 years, suggesting grip assistance may enhance force output during maximal isometric pulling tasks.
Original Statement
“The results of this study indicate that the use of lifting straps led to an increase in isometric mid-thigh pull performance (p=0.001).”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study used a within-subjects design but lacks confirmed randomization and blinding, so it cannot support causal language like 'led to an increase'. Only association is justified.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Systematic Review & Meta-AnalysisLevel 1aWhether lifting straps consistently improve isometric pulling force across diverse populations and protocols, accounting for variability in grip strength and training status.
Whether lifting straps consistently improve isometric pulling force across diverse populations and protocols, accounting for variability in grip strength and training status.
What This Would Prove
Whether lifting straps consistently improve isometric pulling force across diverse populations and protocols, accounting for variability in grip strength and training status.
Ideal Study Design
A meta-analysis of all randomized controlled trials comparing isometric mid-thigh pull force with and without lifting straps in healthy adults aged 18–40, with standardized dynamometer protocols, grip strength covariates, and outcome reporting; minimum 10 studies, total n>200 participants.
Limitation: Cannot establish mechanism or long-term training adaptations.
Randomized Controlled TrialLevel 1bWhether lifting straps causally improve isometric pulling force when randomization and blinding are properly implemented.
Whether lifting straps causally improve isometric pulling force when randomization and blinding are properly implemented.
What This Would Prove
Whether lifting straps causally improve isometric pulling force when randomization and blinding are properly implemented.
Ideal Study Design
A double-blind, crossover RCT of 30 healthy males aged 18–25, randomized to perform isometric mid-thigh pulls with or without lifting straps (counterbalanced order, 7-day washout), using a validated back-leg dynamometer, with outcome assessors blinded to condition; primary outcome: peak force (N).
Limitation: Cannot generalize to females or trained athletes without separate trials.
Prospective Cohort StudyLevel 2bWhether habitual lifting strap use over time correlates with greater gains in pulling strength during resistance training programs.
Whether habitual lifting strap use over time correlates with greater gains in pulling strength during resistance training programs.
What This Would Prove
Whether habitual lifting strap use over time correlates with greater gains in pulling strength during resistance training programs.
Ideal Study Design
A 12-week prospective cohort tracking 100 resistance-trained males using or not using lifting straps during deadlifts, measuring weekly isometric mid-thigh pull force, grip strength, and training volume; controlling for baseline strength and nutrition.
Limitation: Cannot rule out confounding by training intensity or motivation differences.
Cross-Sectional StudyLevel 3Whether athletes who regularly use lifting straps demonstrate higher baseline isometric pulling strength compared to non-users.
Whether athletes who regularly use lifting straps demonstrate higher baseline isometric pulling strength compared to non-users.
What This Would Prove
Whether athletes who regularly use lifting straps demonstrate higher baseline isometric pulling strength compared to non-users.
Ideal Study Design
A cross-sectional comparison of 50 powerlifters and strongman athletes who habitually use lifting straps vs. 50 who do not, matched for age, training experience, and body composition, measuring peak isometric mid-thigh pull force.
Limitation: Cannot determine if strap use causes higher strength or if stronger athletes are more likely to use straps.
Case-Control StudyLevel 3Whether individuals with low grip strength are more likely to use lifting straps during maximal pulling tasks.
Whether individuals with low grip strength are more likely to use lifting straps during maximal pulling tasks.
What This Would Prove
Whether individuals with low grip strength are more likely to use lifting straps during maximal pulling tasks.
Ideal Study Design
A case-control study comparing 30 athletes with low grip strength (<70% body weight) to 30 with normal grip strength, matched for age and training history, assessing strap usage frequency during deadlifts and mid-thigh pulls.
Limitation: Retrospective recall bias and inability to infer causality.
Evidence from Studies
Supporting (1)
The Effect of Lifting Straps Use on Isometric Mid-Thigh Pull Strength Performance
The study found that using lifting straps helped young men pull harder during a strength test, just like the claim said. The straps made it easier to hold the bar, so they could push more force without their grip giving out.