---
title: Predicting one repetition maximum from the results of isometric strength tests
description: "Lumbar paraspinal muscle fatigability in repetitive isoinertial loading: EMG spectral indices, Borg scale and endurance time."
image: https://hub.david.fi/hubfs/EVID%C3%89NCIA%20CIENT%C3%8DFICA.jpg
---

Research - Validation Studies 

## Predicting one repetition maximum from the results of isometric strength tests

#### Year: 2024  Country: Finland   Study Population: N=15 healthy volunteers

Wahlroos N. Predicting one repetition maximum from the results of isometric strength tests. Turku University of Applied Sciences. Bachelor’s Thesis; 2024. 

#### Objective

The study aimed to determine whether maximum voluntary isometric contraction (MVIC) values could be reliably converted into one repetition maximum (1RM) values in order to develop a mathematical formula for the conversion. A secondary aim was to examine the relationship between 1RM and isometric muscle strength measured with David exercise devices.

#### Methods

The study participants comprised of healthy, trained men (n = 6) and women (n = 9). 1RM and MVIC tests were carried out at the Nordic Health clinic located in Helsinki. Data was collected from 20 different exercises using David exercise devices. A linear regression analysis of the participants' 1RM and their isometric test results was conducted. Zero points (0Nm/0Kg) were added manually to improve accuracy on low isometric test results. The results of this analysis were inserted into the standard regression formula. Based on this, a device-specific formula was created for each device.

#### Outcome

As a result of this thesis, a strong correlation between 1RM and MVIC values was found (0.89). Additionally, a device-specific formula to estimate a person’s 1RM based on the results of the isometric muscle strength measurement was developed

[ Link to the study ](https://www.theseus.fi/handle/10024/853768)

[Validation Studies](https://hub.david.fi/en/scientific-evidence-exercise-therapy?hsLang=en)

[Outcome Studies](https://hub.david.fi/en/scientific-evidence-exercise-therapy?hsLang=en)

[Supporting Studies](https://hub.david.fi/en/scientific-evidence-exercise-therapy?hsLang=en)

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![EVE-exercise-screen](https://hub.david.fi/hubfs/social-suggested-images/EVE-exercise-screen.jpg "EVE-exercise-screen")