Validation Studies | Spleeft App | Velocity Based Training

Validity and Reliability of an iPhone and Apple Watch App to Measure Jump Height

by Iván de Lucas RogeroValidation Studies 23/07/2025No Comments

For several years, we’ve been publishing data showing that Spleeft is a reliable tool for measuring movement velocity. More recently, we’ve expanded and optimized the app to also measure jump height, recognizing it as another key metric for monitoring both training effectiveness and the fatigue it generates. DOWNLOAD SPLEEFT APP NOW FOR iOS, ANDROID AND …

The Data Science Project Behind Spleeft

by Iván de Lucas RogeroCase Studies, Validation Studies 09/07/202509/07/2025No Comments

In this article, I share — from a technical and reflective perspective — the learning and development process behind the latest optimization of the Spleeft algorithm. I’ll explain how the original system, developed four years ago, works and how, over the past month, I’ve fine-tuned its parameters to improve both accuracy and processing speed. DOWNLOAD …

Reliability, Validity, Measure Barbell Velocity, Apple Watch, iPhone, Spleeft, Fitness App, Gym App

Validity And Reliability Of Spleeft To Measure Barbell Velocity With Your Apple Watch And iPhone

by Iván de Lucas RogeroValidation Studies 15/07/202407/07/2025One Comment

Some weeks ago, we published a proof white paper which explaining everything about our algorithm, the technology behind it and lots of data proving why you should trust measurements. The aim of this blog is to summarize the key findings of this study. You can download the full paper and the raw data here. We …

Scientific Validity and Reliability Of An IMU-based App To Track Barbell Velocity

by Iván de Lucas RogeroValidation Studies 24/09/202227/02/2024No Comments

INTRODUCTION – Scientific Validity After validating and testing with real users the measurement of running speed with the mobile camera (you can read the presentation here and the validation here), we realized that reliability was not everything when developing technology for athletes. The scientific validity and reliability of Computer Vision to track barbell velocity is …

Spleeft is a valid and reliable app to measure movement velocity at resistance training

by Iván de Lucas RogeroValidation Studies 17/05/202201/10/2024No Comments

INTRODUCTION Quantifying movement velocity is the only way to control intensity and level of effort at the gym. Each velocity is hugely correlated with a percent of the repetition maximum (%RM) (1). Moreover, by monitoring velocity loss during the series you can control the level of effort and fatigue levels during the series (2). Thus, …