Accuracy of Prediction Equations to Calculate Maximum Strength

NCT06718699 | Enrolling By Invitation

• 2 other identifiers: PREDEQPhysiomed ID 101
• Study Type: observational
• Target: 120
• Locations: 1 country
• Sites: 1

Brief Summary

Resistance exercise training (RT) is a key component of health related exercise programs. However, an accurate specification of RT load prescription is essential for effective and safe achievement of training aims. Proper specification of exercise intensity might be the most critical issue when designing RT protocols for adults. One repetition maximum tests (1RM) have been considered the "gold standard" of dynamic maximum strength evaluation. Although the argument of increased risk of injuries and adverse effects with 1RM testing in older people has been rejected by several studies , limited motivation to lift maximum loads, requirement for high test effort, time constraints, and interruption of the continuity of the training process aggravate the frequent application of 1RM tests particularly in non-athletic RT. 1RM prediction equations that use the load and number of repetitions completed to fatigue (RTF) to predict repetition maximum might be a reliable and feasible option to 1RM testing. Thus, the primary aims of this study were to evaluate the predictive accuracy of current RTF equations and to develop an equation that more accurately predicts 1RM from RTF tests.

Conditions

Healthy Aging

Keywords

maximum strength; one repetition maximum; repetitions to fatigue; prediction equation; resistance exercise

Outcome Measures

Primary Outcomes (1)

• Maximum load, one repetition maximum, leg press

  Maximum load lifted once (1RM, in kg) for the leg press exercise

  At baseline - no follow up tests

Secondary Outcomes (27)

• Maximum load lifted at 5-8RM, leg press

  At baseline - no follow up tests

• Maximum load lifted at 9-12RM, leg press

  At baseline - no follow up tests

• Maximum load lifted at 13-16 RM, leg press

  At baseline - no follow up tests

• Maximum load, one repetition maximum, lat pulls

  At baseline - no follow up tests

• Maximum load lifted at 5-8 RM, lat pulls

  At baseline - no follow up tests

Interventions

resistance exercise tests OTHER

One 1RM and three RTF tests (5-8RM, 9-12RM, 13-16RM) on seven resistance training devices

Eligibility Criteria

• Age: 18 Years - 85 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

The study population consists of resistance trained and untrained women and men 18 to 35 or 60-85 years old that are able to complete 1RM and RTF tests without endangering their health

You may qualify if:

• to 35 years old
• to 85 years old

You may not qualify if:

• Contraindication for one repetition maximum tests
• musculoskeletal injuries that may prevent a reliable and safe assessment of the 1RM and RTF tests

Sponsors & Collaborators

• University of Erlangen-Nürnberg Medical School: lead

Study Sites (1)

Institute of Radiology, University Hospital NErlangen

Erlangen, 91054, Germany

Location

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor Dr. PhD, Research Director

Study Record Dates

• First Submitted: December 1, 2024
• First Posted: December 5, 2024
• Study Start: December 2, 2024
• Primary Completion (Estimated): August 31, 2026
• Study Completion (Estimated): September 30, 2026
• Last Updated: January 29, 2026

Record last verified: 2026-01

Locations

DE (1)