Less-Discussed Health Checks at 40
The standard preventative panel covers blood work and major scans. There’s a second tier of less-discussed checks that don’t get into the obvious longevity guides but matter substantially for the lean ultra-runner phenotype.
This page covers six of them, in rough order of leverage.
1. Sleep apnea screening — even for lean athletes
The popular framing is that sleep apnea is an obesity problem. Lean people can absolutely have obstructive sleep apnea (OSA) — it’s driven by airway shape:
- Narrow palate
- Deviated septum
- Retropositioned (set-back) lower jaw
- Large tonsils or tongue base
- Indian and East Asian craniofacial structure can predispose
Endurance athletes have a specific confound: a low resting heart rate masks the cardiovascular stress signal that often prompts a sleep-apnea referral. A doctor sees resting HR of 48 and looks elsewhere.
Why it matters
Untreated OSA causes:
- Hypertension (resistant kind, doesn’t respond well to medication)
- Atrial fibrillation risk
- Cognitive decline (the desaturations damage brain tissue)
- Daytime fatigue (often attributed to overtraining)
- Reduced exercise performance
The screen
A home sleep test (HST) is the right entry point. No clinic stay required.
- WatchPAT — finger-worn sensor; FDA-approved; widely available globally
- ResMed ApneaLink — clinic-prescribed, common in Korea and India
- Lumio or Wesper — newer at-home options
Costs: USD 200–500 one-time. The test produces an Apnea-Hypopnea Index (AHI):
- AHI < 5: normal
- AHI 5–15: mild OSA
- AHI 15–30: moderate OSA
- AHI > 30: severe OSA
If positive, treatment options:
- CPAP (Continuous Positive Airway Pressure) — most effective; takes 2–4 weeks to adapt
- Mandibular Advancement Device (MAD) — custom dental appliance; less effective than CPAP but better-tolerated, especially for mild-to-moderate
- Positional therapy — for purely positional OSA (only when sleeping on back), wearable devices that nudge sleepers off their back
Worth running the test once at 40 even with no symptoms.
2. Hormone baselines — testosterone, cortisol, thyroid
Hormones decline with age. The trajectories matter; you can’t know the trajectory without a baseline.
Testosterone
- Naturally declines ~1% per year after 30
- Endurance training tends to suppress T further (chronic Zone 2/3 stress, low body fat)
- Lean ultra-runners often run lower than age-matched sedentary peers
Test: Total T, free T, SHBG (fasted morning sample)
Reference for 40s:
- Total T: 500–800 ng/dL (lab “normal” floor is 270, which is too low)
- Free T: top third of lab range
- SHBG: 20–60 nmol/L
If low: sleep optimisation, body fat normalisation, training periodisation are first-line interventions. Don’t jump to TRT (testosterone replacement therapy) at 40. Once on TRT, the body shuts down endogenous production and it becomes very difficult to come off. TRT is a 50s/60s decision in most cases.
Cortisol
Chronic stress shrinks the hippocampus and accelerates aging. INTPs under-report subjective stress (intellectualisation as default coping), so the lab value is more honest than the felt sense.
Test: AM serum cortisol, fasted (7–9 AM ideal); or 4-point salivary cortisol if more detail wanted
Reference: 6–18 µg/dL between 7–9 AM; persistently above 20 = stress load
If elevated: the interventions are unglamorous — morning sunlight, meditation, deliberate work boundaries, reduced caffeine, breathwork (4-7-8 or box breathing).
Thyroid (TSH + free T3 + free T4)
Endurance athletes commonly run subclinical low T3 — the body downregulating active thyroid hormone to conserve energy.
Test: TSH, free T3, free T4 (not just TSH)
References:
- TSH: 0.4–2.5 mIU/L optimal (lab range goes to 4.5 but anything above 2.5 is suboptimal)
- Free T3: at the upper third of the lab range
If low T3 with normal TSH: evaluate training load, caloric intake, sleep — often the body is downregulating from chronic stress / undereating. The fix is usually environmental, not medical.
3. Skin checks — outdoor athletes specifically
Two decades of outdoor running means accumulated UV exposure on the face, ears, neck, and shoulders. Indian skin tone reduces melanoma risk substantially but doesn’t eliminate it. Basal cell carcinoma and squamous cell carcinoma affect all skin tones.
What to do
- Annual dermatologist full-body skin exam. Takes 15 minutes. USD 50–150 in most countries.
- Self-check monthly. The ABCDE rule for moles:
- Asymmetry
- Border irregular
- Colour varied
- Diameter > 6 mm
- Evolving (changing in shape, size, colour)
- Wear sunscreen on long outdoor runs. SPF 30+ on face, ears, neck. Reapply every 2 hours for ultras.
- Sun-protective clothing for the brutal middle hours (10 AM – 4 PM). UPF 50 running shirts are widely available.
- Sunglasses outdoors — see eye section in Preventative Health Panel at 40
4. Pelvic floor — the male endurance athlete blind spot
Almost never discussed. Two decades of endurance running and especially cycling chronically compress the perineum and pelvic floor. Issues that show up at 60+ — erectile dysfunction, urinary symptoms, pelvic pain — often trace back to decades of accumulated load.
Specific protocol
- Bike saddle fit. A poorly-fitted saddle is a persistent pelvic-floor stressor. Get a pressure map at a serious fit shop (most have a Specialized Body Geometry Fit or equivalent). Wrong saddle for 20 years causes real damage. Cost: USD 100–300 for the fit; new saddle USD 100–250.
- Hip mobility work daily. 5-minute routine: hip circles (10 per direction), 90/90 stretches (60 sec per side), deep squat holds (60 sec total).
- Reverse Kegels — relaxation of the pelvic floor, not contraction. Most male pelvic-floor issues are hypertonic (too tight), not weak. Standard Kegel advice can make it worse.
- Alternating sports. Cycling alone is the worst long-term load on the pelvic floor. Running, swimming, climbing rotate the load.
If symptoms appear
A pelvic-floor physical therapist (it’s a real specialty, increasingly available in major cities) is the right first specialist, not a urologist. PFPT addresses muscular dysfunction; a urologist usually goes straight to medication or surgery, neither of which fixes the root cause.
In Korea, search for “골반저 물리치료” (pelvic-floor physiotherapy). In India, larger hospitals (Apollo, Manipal, Aster) increasingly offer it; smaller cities require travel to tier-1 hubs.
5. Periodontal disease as cardiovascular risk
Gum disease is now a confirmed independent risk factor for cardiovascular disease. The mechanism:
- Bacteria from inflamed gum pockets (especially P. gingivalis) enter the bloodstream
- They lodge in arterial plaques and drive chronic inflammation
- The same bacteria are found in the brain tissue of late-stage Alzheimer’s patients
Severe periodontitis roughly doubles cardiovascular event risk. Mild gingivitis is a precursor.
What to do
- Dental cleaning every 6 months minimum. Every 3–4 months if any gum disease history. See Oral Microbiome and Mouthwash Paradox for the broader oral protocol.
- Don’t ignore bleeding gums when flossing. That’s early gingivitis, not “flossing too hard.”
- Tongue scraping for the oral microbiome (gentle, daily, back to front).
- Water flosser (Waterpik) daily.
- If signs of gum recession or pocket depths > 3 mm: ask the dentist about deep scaling and root planing.
6. HRV as 30-day load dashboard
A Garmin (or Oura, Whoop, Apple Watch) measures heart-rate variability. Most people glance at the daily sleep score and ignore HRV trends.
Daily HRV is noisy. A single bad night doesn’t mean much. The 30-day HRV trend is the chronic autonomic load — the read on cumulative stress that subjective feeling doesn’t accurately report (especially for INTPs who default to intellectualisation).
How to use it
- Look at the 30-day average HRV trend (most watches surface this)
- A 15% drop over 30 days is a real signal — chronic cortisol, undertraining recovery, sleep deficit, or all three
- A sustained upward trend is the goal; HRV improves with training, sleep, recovery, social rest
What to do when HRV is trending down
- Morning sunlight — 5–10 minutes in the first hour of waking, eyes open to the sky (not through a window). Sets circadian rhythm.
- Breathwork — 5–10 minutes daily of box breathing (4 in, 4 hold, 4 out, 4 hold) or 4-7-8 (4 in, 7 hold, 8 out)
- Reduce intensity (not necessarily volume) of training
- Cut alcohol in the 3 hours before bed
- Cold exposure — 1–3 minutes cold rinse at end of shower can boost vagal tone over weeks
If HRV remains depressed despite interventions, the problem may not be physical — work stress, life transition, undiagnosed sleep issue (see sleep apnea section above), or sub-clinical illness. Worth a doctor visit.
What this all costs
| Item | Frequency | Cost (USD) |
|---|---|---|
| Home sleep test | Once at 40 | 200–500 |
| Hormone panel | Annual | 50–150 (added to standard blood panel) |
| Dermatology skin check | Annual | 50–150 |
| Bike saddle fit | Once | 100–300 |
| Pelvic-floor PT visit | As needed | 80–150/session |
| Garmin or Oura (HRV) | Already owned | 0 |
Total one-time cost roughly USD 500–1,500. Annual recurring USD 100–300. Among the higher-leverage discretionary health spends in this age band.