Training a lot and aging wrong

A patient came in the other day who trains three to four times a week and has done so for twenty years. Cycles on the weekend, runs midweek, lifts because "you have to." Eats clean. Sleeps reasonably. Is 47.

And wakes up inflamed. The knees hurt on hills. The strength he had at 35 is no longer there. Body composition got worse, thin on the outside, no real lean mass. The biological-age test came back above the chronological age.

The uncomfortable question I had to ask him: what if the problem is the training?

This article is not about how to train right. It is about how to find out that you are training wrong, before the liability becomes injury, lean-mass loss, or ten years of metabolic plateau. The prescription has another address, linked at the end. Here the work is diagnosis.

Why the subjective thermometer lies

The amateur athlete who comes to the office almost always brings the same reading: I train, I feel fine, I do what I have always done. The problem is that this reading is subjective, and physiology after 40 stopped respecting perception. At 30, perceived effort and real stimulus ran together. At 45, they diverge.

I have seen this over and over: the patient is convinced the training is "the same." What changed was the terrain. Tendons, ligaments, protein synthesis, the HPG axis (hypothalamic-pituitary-gonadal), deep sleep, autonomic recovery — all lost margin. The same stimulus, in today's physiology, is overreaching. And the body leaves an objective trail that the subjective thermometer does not catch.

That trail is in the markers. And almost no one asks for them.

The signs that betray the wrong training

It is not one isolated sign. It is a pattern that repeats consult after consult, and which, read together, closes the diagnosis well before the complaint becomes injury.

hs-CRP persistently above 2.0 mg/L. In someone with no active infection, no known autoimmunity, no relevant visceral obesity, and no periodontal disease, hs-CRP at 2-5 mg/L sustained over time is usually the echo of a stimulus the body has not finished absorbing. It is not a "disease" number. It is an elevated background number. The low-grade inflammatory panel, over the long run, becomes the substrate of everything you want to avoid.

Low ferritin, especially in endurance athletes and in women. Endurance athletes lose iron through three routes: sweat, foot-strike hemolysis, and subclinical gastrointestinal loss. Ferritin below 30 ng/mL in someone who trains a lot is not the "lower limit of normal." It is functional depletion. Typical symptom: fatigue that does not yield to sleep, breathlessness in efforts that used to feel easy, slower recovery. Transferrin saturation alongside refines the reading.

Testosterone falling at 40, with symptoms. There is a condition described in the literature as exercise-hypogonadal male condition — a trained man with total testosterone in the low-normal range or below, with falling libido, fragmented sleep, worse recovery. It is not classical hypogonadism. It is functional suppression of the HPG axis by chronic, unrecovered load. The useful reading is total testosterone + SHBG (to calculate free), LH and FSH (to see whether the suppression is central), and correlation with symptoms.

Heart-rate variability falling, resting heart rate rising. HRV is the best non-invasive proxy for autonomic tone. Whoever trains well and recovers well has stable or slowly rising HRV. Whoever is in chronic overreaching sees HRV drop week after week, even while feeling "fine." Resting heart rate moving the opposite way — climbing 5-10 bpm above the historical baseline — closes the signal.

Stagnant or falling lean mass despite the volume. This is the most frustrating finding for the patient, because they "train." DEXA shows the truth: ALMI (Appendicular Lean Mass Index) below what is expected for age and height, percent visceral fat inadequate for the training load. A thin person with hidden sarcopenia — functional "skinny fat" — is not rare in this profile. The scale does not see it.

Repeat injuries in the same pattern. Tendinopathy that returns every time the load goes up. A strain that always shows up in the same muscle group. Recurrent low-back pain. Each injury in isolation is "bad luck," but the repeated pattern is diagnostic: tissue that has lost its margin for adaptation because the stimulus is greater than the recovery. Physiotherapy in isolation does not solve it. It is solved when the input is adjusted.

The minimum panel to investigate

Whoever suspects they fit this picture does not need an exotic panel. The orders that actually make a difference are objective and almost all fit into an annual routine:

• Inflammatory panel: hs-CRP, ferritin, transferrin saturation, TSH, free T4, reverse T3.
• Male hormonal panel: total testosterone, SHBG, LH, FSH; if there is a sexual complaint, prolactin and estradiol.
• Female hormonal panel: depending on reproductive phase, estradiol, progesterone, FSH, LH, prolactin, SHBG, and DHEA-S. The female athlete triad — low energy availability, menstrual dysfunction, low bone density — calls for a dedicated reading.
• Body composition by DEXA, with appendicular lean mass and visceral fat. Bioelectrical impedance does not substitute for it in someone who trains.
• Objective aerobic capacity: CPET (cardiopulmonary exercise test with gas exchange and lactate), which gives real VO₂ max and lactate threshold — the test that separates "subjectively intense training" from "training at the right stimulus."
• Autonomic monitoring: HRV in the morning, fasting, lying down, with a consistent device. Minimum window of 4 to 6 weeks to interpret the trend.

You do not have to do it all at once. The inflammatory + hormonal panel + DEXA already closes most of the stories. CPET and HRV come in when the signal needs refinement.

Why an isolated personal trainer does not close the diagnosis

A personal trainer reads movement, reads effort, adjusts load. Essential, and no one trains well without it. But, with rare exceptions, rarely reads a hormonal panel, ferritin, hs-CRP, body composition by DEXA. And almost never speaks with the physician who prescribes.

The result, in what I see recurrently, is a training plan that may be technically competent, but operates in the dark relative to the athlete's biological terrain. When the terrain is wearing down — testosterone falling, ferritin low, sleep insufficient — any program hits a wall. The patient concludes that "I do not respond to training." What he does not respond to is stimulus without reading.

The integration between whoever designs the training and whoever reads the panel is what changes the game. It is not a luxury. It is the entry door to what works.

The sentence that matters

Training a lot is not a virtue. Training with diagnosis is. The difference, over the long run, is between building longevity and accumulating liability. And the window in which that difference is set is exactly the decade between 40 and 50.

Diagnosis before prescription. If the signs above already showed up in your panel, or if you suspect they would, it is worth reading next the training method that works after 40 — Zone 2, targeted high intensity, strength — in Training to age well: the formula is Zone 2 and strength.

You cannot erase time. You can stop spending it on the wrong effort.