Your lactate test was sold to you, not designed for you

The finger prick and the printed zone chart look like science, but for most club runners they answer a question nobody asked.

A club runner pays for a treadmill test, gets five training zones printed on a card, sticks it on the fridge, and trains inside those bands for a year. Then they run the same race time as the year before and conclude they need a better plan. They probably needed a better question.

The measurement itself is sound enough. Blood lactate rises with intensity, the curve bends at a point that correlates with sustainable racing, and knowing roughly where that point sits is genuinely useful information. The problem is everything wrapped around it.

Start with the protocol. A stepped test with three or four minute stages on a treadmill on a Tuesday evening after a working day produces a curve. A different stage length produces a different curve. A different warm-up produces a different curve. A low carbohydrate week beforehand shifts it too, which means an athlete who happened to test in a depleted state gets prescribed a year of training built on a bad afternoon.

Then there is the transfer problem. Treadmill running is not road running. There is no wind, no braking on corners, no camber, and the belt assists the recovery of the leg in a way that flatters efficiency. Zones derived indoors and applied outdoors are already a translation, and nobody tells the athlete that.

The deeper issue is that most amateurs do not fail because their easy runs were three beats per minute too fast. They fail because they run four hours a week, most of it at one indistinguishable middling effort, and no test can fix a volume problem. Five precise zones on a fridge magnet do not create the hours needed to make those zones meaningful.

I am not against testing. I am against selling testing as the missing piece to people whose missing piece is time, sleep and consistency, and I think the sports science industry has been happy to blur that line because a lab test is a product and consistency is not.

Where it earns its money is in an athlete already doing the work who cannot tell easy from moderate by feel, and there are plenty of those. Repeat testing that tracks the same protocol across a year is also worth having, because a curve moving left is a real signal even when its absolute values are shaky.

One test, one card, one year of obedience is not physiology. It is a receipt.