Day-to-day variables can also affect results. Sleep, nutrition, hydration, recovery, and even equipment can influence how well someone performs on test day. "The thing about endurance sports is that what you put in is what you get out," says McQuality. In lab testing, his team found that carbon-plated running shoes slightly improve VO2-related performance by increasing efficiency, allowing runners to sustain higher workloads before fatigue sets in. Taken together, these factors help explain why VO2 max is best viewed as a context-dependent snapshot, not a fixed measure of physical fitness. It's most useful when tracked over time, under similar conditions, and alongside other markers of performance and health.

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Changing the Game At HELIX, we apply the latest developments in AI, computer vision, LIDAR and cloud computing at scale for the benefit of real estate owners, property managers and tenants. Our solutions are in closed beta and only available to a select group of the most admired companies in the world. If you want to play a key role in this transformation, send us a note. The Role As a Senior Research Engineer you will join our growing Applied R&D team in London and will drive technical innovations that fuel our product. You will conduct applied research projects from prototyping to deploying deep learning methods applied to 2D and 3D computer vision.