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NCT Number: NCT06718699

Accuracy of Prediction Equations to Calculate Maximum Strength

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.

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Key information

Conditions

Healthy Aging

Age range

18 year–85 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Institute of Radiology, University Hospital NErlangen

Erlangen, 91054, Germany

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • 18 to 35 years old
  • 60 to 85 years old

Exclusion criteria

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

Treatment and study plan

resistance exercise tests

Other

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

Primary outcomes

  1. Maximum load, one repetition maximum, leg press

    Time frame: At baseline - no follow up tests

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

Secondary outcomes

  1. Maximum load lifted at 5-8RM, leg press

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the leg press exercise

  2. Maximum load lifted at 9-12RM, leg press

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT9-12, in kg) for the leg press exercise

  3. Maximum load lifted at 13-16 RM, leg press

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT13-16, in kg) for the leg press exercise

  4. Maximum load, one repetition maximum, lat pulls

    Time frame: At baseline - no follow up tests

    Maximum load lifted once (1RM, in kg) for the latissimus pull exercise

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

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the latissimus pull exercise

  6. Maximum load lifted at 9-12 RM, lat pulls

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the latissimus pull exercise

  7. Maximum load lifted at 13-16 RM, lat pulls

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the latissimus pull exercise

  8. Maximum load, one repetition maximum, triceps dips

    Time frame: At baseline - no follow up tests

    Maximum load lifted once (1RM, in kg) for the triceps dips exercise

  9. Maximum load lifted at 5-8 RM, triceps dips

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the triceps dips exercise

  10. Maximum load lifted at 9-12 RM, triceps dips

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the triceps dips exercise

  11. Maximum load lifted at 13-16 RM, triceps dips

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the triceps dips exercise

  12. Maximum load, one repetition maximum, trunk extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted once (1RM, in kg) for the trunk extension exercise

  13. Maximum load lifted at 5-8 RM, trunk extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the trunk extension exercise

  14. Maximum load lifted at 9-12 RM, trunk extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the trunk extension exercise

  15. Maximum load lifted at 13-16 RM, trunk extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the trunk extension exercise

  16. Maximum load, one repetition maximum, trunk flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted once (1RM, in kg) for the trunk flexion exercise

  17. Maximum load lifted at 5-8 RM, trunk flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the trunk flexion exercise

  18. Maximum load lifted at 9-12 RM, trunk flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the trunk flexion exercise

  19. Maximum load lifted at 13-16 RM, trunk flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the trunk flexion exercise

  20. Maximum load, one repetition maximum, leg flexion

    Time frame: At baseline - no follow up tests

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

  21. Maximum load lifted at 5-8 RM, leg flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the leg flexion exercise

  22. Maximum load lifted at 9-12 RM, leg flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the leg flexion exercise

  23. Maximum load lifted at 13-16 RM, leg flexion

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the leg flexion exercise

  24. Maximum load, one repetition maximum, leg extension

    Time frame: At baseline - no follow up tests

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

  25. Maximum load lifted at 5-8 RM, leg extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 5-8 times (RFT5-8, in kg) for the leg extension exercise

  26. Maximum load lifted at 9-12 RM, leg extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 9-12 times (RFT9-12, in kg) for the leg extension exercise

  27. Maximum load lifted at 13-16 RM, leg extension

    Time frame: At baseline - no follow up tests

    Maximum load lifted 13-16 times (RFT13-16, in kg) for the leg extension exercise

Sponsors and collaborators

Lead sponsor

University of Erlangen-Nürnberg Medical School

Other

Registry information

Official study title

Accuracy of a New Prediction Equation to Calculate One Repetition Maximum (1RM) in Trained and Untrained Young and Old Adults

Important dates

Study start
2024
Primary completion
2026
Study completion
2026
First posted
Dec 5, 2024
Registry last updated
Jan 29, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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