The Challenge
Following completion of academic training, Jack O’Neill the founder of Rua Laboratories, set out to build a business that bridges the gap between elite physiological testing and practical, results-driven coaching. The primary barrier was accessibility. Traditional metabolic testing systems are expensive, stationary, and difficult to integrate into private performance environments.
There was also a need to move beyond simple data reporting. The goal at Rua Laboratories was to ensure athletes not only received test results, but also understood how to train, why those metrics mattered, and how to structure future training blocks for meaningful adaptation and desired results.
The Solution
VO2 Master enabled this vision to become a reality. Its portable and streamlined design allowed Rua Laboratories to establish a high-performance testing model inside Fianna Athletic Club in Dublin, delivering professional-grade metabolic testing in a real-world training environment.
This setup supports a wide range of athletes, including recreational runners, endurance athletes, HYROX and CrossFit competitors, field-sport players, and high-performance athletes. VO2 Master provides the foundation for VO2 max testing and metabolic assessment, which is then integrated with additional performance diagnostics such as lactate profiling, body composition analysis, jump and reactive strength testing, isometric force testing, and sweat rate and composition analysis.
The result is a comprehensive performance testing service that translates directly into actionable coaching insight. Each athlete leaves not only with physiological data, but also with a clearly defined 16–20 week training direction designed to improve performance efficiently and sustainably.
Why VO2 Master
The decision to adopt VO2 Master was driven by three key factors: affordability, portability, and ease of use. For a newly established business, affordability made high-level metabolic testing commercially viable from day one.
Portability enabled testing to be conducted in a private gym environment without the need for a traditional laboratory setup. Ease of use allowed the focus to remain on athlete interpretation and coaching rather than technical equipment management.
VO2 Master data is used to assess aerobic capacity, define training zones, guide conditioning strategies, and support broader strength and conditioning programming.
As the founder of Rua Laboratories notes:
VO2 Master provides the data needed to connect physiology directly with practical coaching decisions.
Dr. Jack Eoin Rua O’Neill, PhD
Exercise Physiologist (ACSM-EP)
The Impact
The integration of VO2 Master has enabled Rua Laboratories to establish a modern sports science service combining physiological testing, strength and conditioning expertise, and individualized training prescription.
Athletes no longer receive only a VO2 max score, they receive a complete performance profile outlining current fitness status, key limiting factors, and precise training recommendations. This includes guidance on aerobic development, threshold training, VO2 max intervals, recovery intensities, race preparation, and fueling strategies.
The VO2 Master post-test reporting system has significantly streamlined the consultation process, reducing turnaround time between testing and feedback delivery to just a few minutes. This has improved both workflow efficiency and the clarity of athlete communication.
Client Outcomes Observed
A major outcome has been increased athlete clarity. Many clients arrive uncertain about training intensities and session structure. Post-testing, they leave with precise training zones and a structured plan for the next 16–20 weeks.
Endurance athletes gain clear guidance on easy, threshold, and high-intensity work. Strength and conditioning athletes learn how to improve aerobic capacity without compromising strength or power development.
Another key outcome is improved athlete confidence. Clients can clearly understand their current performance level, identify what needs improvement, and track progress through repeat testing. The visual reporting provided by VO2 Master further simplifies this process, supporting faster interpretation and more effective coaching conversations.
