Fifteen trained athletes (≈80% male) aged between 23 and 45 years participated in the study. All participants had a minimum of three years of consistent structured training history. Athletes represented a mixed sporting background including endurance, hybrid, and high-intensity functional training disciplines.

Results indicate meaningful improvements in submaximal aerobic efficiency in the Stamox group compared to both control and commercially available beetroot products.

Participants were allocated into three groups (n=5 per group): a Stamox supplementation group, a non-supplemented control group, and a comparison group consuming commercially available beetroot-based products. This was an internal applied performance study using a pre–post intervention design.

All participants completed cardiopulmonary exercise testing on an Assault Bike using a 1-minute ramp protocol to volitional exhaustion. 

Testing was conducted pre- and post-intervention under consistent conditions. Gas exchange data were collected and analysed using the PNOE metabolic analysis system.

Ventilatory thresholds (VT1 and VT2) were determined automatically using PNOE software algorithms.

The intervention period lasted four weeks.

The Stamox group consumed the patented beetroot-derived supplement according to manufacturer instructions as stated on product packaging. The control group did not consume any supplementation.

The market comparison group consumed commercially available beetroot-based products. Participants maintained their habitual sport-specific training throughout the intervention period. No additional dietary or supplement controls were imposed.

The Stamox group demonstrated consistent improvements in FatMax and VT1, indicating enhanced submaximal aerobic efficiency and improved oxygen utilisation at lower and moderate intensities.

These adaptations are physiologically consistent with nitric oxide–mediated improvements in muscle perfusion and mitochondrial efficiency. Changes in VT2 were modest across all groups, aligning with expectations for short-duration interventions targeting peripheral adaptations.

For endurance and hybrid athletes, improvements in FatMax and VT1 may translate to greater efficiency during long-duration training and competition.

The observed changes suggest potential benefits for aerobic durability, training quality, and sustainable performance rather than acute maximal output.

This study was conducted as an internal applied investigation with a small sample size. Training and dietary intake were not strictly controlled, and compliance was self-managed. Findings should be interpreted as indicative rather than definitive and warrant further controlled investigation.

This was an internal applied study with a limited sample. However, the observed improvements in FatMax, VT1, and VO₂ max are consistent with the well-established mechanisms of dietary nitrate—increased nitric oxide bioavailability, improved blood flow (muscle perfusion), and mitochondrial efficiency—that are widely documented in sports science literature on beetroot supplementation.

All participants provided informed consent prior to testing. The study was conducted as an internal performance evaluation without external ethics committee approval.