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Summary

A test was conducted with identical 4x8 minute sessions - before and after 14 days of Stamox supplementation.

The comparison of Watts per Kilogram (W/kg) shows a clear and progressive improvement across all intervals, with the biggest gain where it counts: fighting fatigue in the final set.

Before: W/kg dropped significantly in interval 4 (4.14 W/kg)
After: W/kg was virtually maintained (4.82 W/kg).

Stamox improved the ability to maintain power under fatigue.

Testing Stamox supplementation

Original report posted here

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Test Methodology

To ensure the most reliable results possible, I repeated the exact same session, on the same incline, and with the same body weight (71 kg). The training consisted of:

  • 40 min warm-up in Z1–Z2
  • 4 x 8 min at FTP, with 11 min recovery between sets
  • 30 min cooling in Z1–Z2


In the first session without supplementation, I recorded power and heart rate values.

Then I started a 14-day trial taking 2 tablespoons of Stamox nitrates dissolved in water, 2 hours before each workout.
Comparison of results: before vs after taking stamox

Comparison Of Results

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PERFORMANCE ANALYSIS

1. Clear increase in sustained power

The most striking change is the increase in power across all series:

  • Series 1: +6 W
  • Series 2: +16 W
  • Series 3: +23 W
  • Series 4: +49 W (the most spectacular improvement)

The most significant finding is what happened in the fourth set.

In the session without Stamox, power output plummeted to 294 W, reflecting accumulated fatigue.

However, after supplementation, the fourth set maintained 343 W, virtually the same as the previous three.

PERFORMANCE ANALYSIS

2. The ability to maintain power output under fatigue improved significantly

Average heart rates were the same or slightly higher - but much more power was generated. This behavior is usually interpreted as:

  • Improved metabolic efficiency
  •  Greater availability of oxygen in the muscles
  • Lower energy cost to produce the same power

Elements that fit with the known physiological effects of nitrates:

  • Vasodilation
  • Lower oxygen cost at submaximal intensities
  • Greater efficiency of muscle contraction
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User Input

The 8 minutes power is a good estimation of the FTP in cycling performance. This session is interesting not just to estimate the FTP of a cyclist, but also to test repeatability and durability. The ability to repeat hard efforts during a training session or a race. Repeatability is set to be one of the most important indicators of performance in endurance sports, specially in cycling, where most competitions go over 2 hours of duration.

Can the improvement be attributed to Stamox?

Despite strictly controlled conditions—using the same route, training, weight, and testing protocol—a clear performance improvement was noted, especially as fatigue set in (from 294 W to 343 W in the fourth series). The observed physiological shift is supported by existing studies on nitrates. However, potential confounders must be acknowledged, including natural gains from the two weeks of training, subtle environmental variations (temperature, wind, etc.), and differences in pacing or athlete motivation.
On individual results:

Performance gains are highly individual and depend on a multitude of factors, including an athlete’s training age, genetic predisposition, training plan, overall diet, and so on. This was a performance report on a single athlete, tested by themselves. The pattern of the data is highly consistent with the scientifically documented effect of beetroot supplementation, and athlete’ own results using Stamox.