Study summary
When velocity-loss thresholds differ between measurement methods
- Measurement validity
- Velocity-based training
- Sport performance
In brief
This thesis compared AlphaPWR centre-of-mass velocity with encoder-measured barbell velocity in one fatiguing back-squat set. AlphaPWR crossed the early velocity-loss thresholds sooner. The difference appeared to reflect greater repetition-to-repetition variation, which means encoder-derived thresholds should not automatically be applied to a different measurement method.
What was studied
Twenty-four semi-professional male ice hockey players completed back squats at 70% of one-repetition maximum until 40% velocity loss. AlphaPWR and a barbell encoder measured the same repetitions concurrently.
What the source reported
- 01
At the first repetition after the 10% threshold, mean velocity loss was 15% with AlphaPWR and 9.2% with the encoder.
- 02
At the first repetition after the 20% threshold, the corresponding values were 25.1% and 19.9%.
- 03
Repetition-to-repetition variation was reported as roughly three times higher for the centre-of-mass measure, causing thresholds to be crossed earlier.
How to interpret the findings
This was a single-set comparison in a specific athlete group. The author called for more research into the source of the variation and how method-specific thresholds should be used in practice.
Source details
- Author(s)
- Henrik Kaspersen
- Institution
- University of Stavanger
- Year
- 2024
- Document type
- Bachelor's thesis
- Length
- 39 pages
- Source language
- Norwegian
The PDF is provided from the source file linked to this record.
This is Alphatek's editorial summary of the linked source. It is not a new peer-reviewed publication or an individual diagnostic recommendation.