The short answer
Hormones matter to cycling. “Hormones” do not form one system that can be scored from a panel and fixed with a training hack.
Testosterone, cortisol, thyroid hormones, growth hormone, oestrogen and progesterone have different control systems, rhythms, clinical meanings and tests. A hard ride can change several of them briefly. Age, menopause, sleep, food, medicines, illness and training history can also affect symptoms or measurements.
If recovery has slowed after 40, begin with the whole pattern:
- What changed, and when?
- Is cycling performance the only problem, or has daily function changed too?
- Are there sexual, menstrual, temperature, bone, weight, mood or neurological symptoms?
- Has training, energy intake, sleep, medication or illness changed?
- Is there a clinical reason for a particular test?
That is a more useful starting point than “check all your hormones.”
Do hormones explain slower recovery after 40?
Sometimes. They are rarely the only explanation.
Ageing influences maximal heart rate, stroke volume, oxygen delivery, muscle mass, motor units, connective tissue, sleep and the life stress surrounding training. Masters-athlete research also shows how much capacity lifelong activity preserves compared with inactivity. A review focused on older athletes describes trainable performance and nutrition factors alongside age-related endocrine changes.
This is the useful frame: biology changes, but age does not tell you which system limits an individual rider today.
A training plateau is a prompt to investigate the programme, fuelling, recovery and health in order. It is not a blood-test diagnosis.
Testosterone: one question, not the whole panel
Testosterone influences reproductive health, bone, red-cell production, muscle and other tissues. It can change acutely with exercise, and some chronically endurance-trained men show lower resting levels.
Clinical hypogonadism still requires compatible symptoms and consistently low testosterone. Fatigue, motivation and watts are too nonspecific on their own. Total testosterone remains the first-line measurement, usually repeated on separate fasting mornings; free testosterone adds information in selected situations.
There is no validated cyclist target at the 50th–75th percentile of a free-testosterone range. There is no rule that a masters rider needs an annual testosterone panel either.
The dedicated cycling and testosterone guide covers exercise effects, symptoms, testing, significant head injury, TRT and TUE requirements. Its clinical foundation is the Endocrine Society guideline.
Cortisol: a stress hormone, not a readiness grade
Cortisol helps regulate energy, blood pressure, immune activity and the response to stress. Exercise is one of many inputs. A rise after a demanding session can be normal.
The internet often divides cortisol by testosterone and calls the result “anabolic versus catabolic balance.” Research is more cautious.
A systematic review and meta-analysis of intensified training biomarkers found some directional association between the testosterone:cortisol ratio and performance, while most biomarkers did not change consistently with performance. A later review of the ratio describes limited, conflicting data and no established threshold.
That means the ratio may be a research signal. It is not a validated diagnosis of overtraining syndrome, a personal recovery budget or a rule for placing two hard sessions.
The cycling cortisol guide explains sampling, daily rhythm and the difference between training stress and adrenal disease.
Thyroid: common symptoms, specific clinical pathway
Thyroid hormones affect metabolism and many organ systems. Hypothyroidism can cause fatigue, cold intolerance, constipation, dry skin, weight change, menstrual changes and cognitive symptoms. Those complaints overlap with underfuelling, anaemia, depression, sleep loss and training fatigue.
There is no evidence that 5–10% of endurance athletes have “subclinical hypothyroidism” or that a cyclist-specific optimal thyroid range should replace clinical interpretation.
NICE thyroid guidance uses a defined testing and treatment pathway. TSH is commonly the first test for primary thyroid disease, with free T4 and other testing used according to the result and clinical context. A default TSH, free T3 and free T4 “performance panel” is not automatically better.
The cycling thyroid guide owns this question in depth.
Does cycling increase growth hormone?
Exercise and sleep can trigger pulses of growth hormone. A temporary exercise response does not prove a higher baseline, superior adaptation or a deficiency.
Growth hormone is released in pulses, so a random measurement is particularly poor evidence. The Endocrine Society hypopituitarism guideline states that single GH measurements are not helpful and recommends stimulation testing when adult deficiency is suspected.
That pathway is for people with a clinical reason to suspect pituitary disease. It is not an annual recovery test for healthy masters athletes. IGF-1 also needs clinical context and does not become a wearable-style readiness score.
Growth hormone is prohibited under the 2026 WADA Prohibited List. It is not a masters-recovery product.
Perimenopause and menopause: symptoms vary
Perimenopause and menopause can affect menstrual bleeding, temperature regulation, sleep, mood, genitourinary health, bone and body composition. The timing and effect on training vary widely.
The evidence does not support telling every woman to use one menstrual-phase schedule, eat an identical protein dose or replace all endurance work with HIIT.
An overview of menopause exercise reviews found some symptom benefits from yoga and less consistent evidence for aerobic exercise, with insufficient evidence for one best exercise prescription. A 2026 resistance and impact review found promising interventions for bone and function but meaningful heterogeneity in design and reporting.
NHS menopause guidance recommends regular activity with weight-bearing and resistance exercise for bone health. Cycling remains valuable for aerobic fitness; it does not provide all the loading that bone needs.
Useful training decisions include:
- adapt hard sessions when sleep or vasomotor symptoms disrupt recovery;
- retain progressive strength work;
- include appropriate weight-bearing or impact work where safe;
- fuel the actual training demand;
- investigate heavy or abnormal bleeding; and
- discuss significant symptoms and HRT with a qualified clinician.
The menopause cycling guide covers the specialist pathway.
Low energy availability can affect multiple systems
When training demand repeatedly exceeds available dietary energy, the body can alter reproductive, bone, metabolic, immune and cardiovascular function. This can affect women and men.
The 2023 IOC REDs consensus treats REDs as a multifactorial clinical syndrome. Menstrual disruption or lower testosterone can be relevant signals, but neither one diagnoses the syndrome alone.
Look for the wider pattern:
- deliberate restriction or unplanned weight loss;
- recurrent bone stress or injury;
- menstrual or sexual changes;
- persistent fatigue or illness;
- stalled adaptation despite rising load; and
- anxiety or rigidity around food and body composition.
The energy-availability and REDs guide and energy-availability tool help organise the conversation. They do not replace clinical care.
Which hormone blood tests should a masters cyclist get?
There is no universal annual list.
Start with the reason for testing:
| Question | Possible clinical direction | Why a blanket panel fails |
|---|---|---|
| Male sexual symptoms or suggestive signs | Repeat morning total testosterone; additional tests if indicated | One free-testosterone result does not diagnose hypogonadism |
| Thyroid-compatible symptoms | TSH-led pathway, with free T4 or other tests as indicated | Athlete “optimal” ranges are not established |
| Usual-age perimenopause or menopause symptoms | Often a clinical diagnosis; tests depend on age and atypical features | A single ovarian-hormone snapshot can be hard to interpret |
| Suspected pituitary disease | Specialist, axis-specific testing | Random GH and random cortisol are not screening scores |
| Underfuelling or REDs concern | Multidisciplinary history and selected tests | No hormone result diagnoses the whole syndrome |
| Isolated cycling fatigue | Review training, sleep, food, illness and symptoms first | More biomarkers create more incidental results |
The blood-testing owner explains how sample timing, laboratory intervals and clinical questions fit together.
What should change in training?
Do not write a programme around a hormone slogan.
Use durable principles:
- Keep hard days purposeful and allow enough recovery to repeat quality.
- Retain progressive strength training for muscle, force and bone support.
- Fuel high-demand sessions and avoid chronic energy deficit.
- Protect sleep without claiming that a particular bedtime “optimises” testosterone or growth hormone.
- Track menstrual, sexual, temperature, illness, bone and daily-function changes when relevant.
- Reassess unexplained deterioration instead of pushing through it indefinitely.
The programme can respond to symptoms before the diagnosis is known: reduce the risky load, keep gentle activity when appropriate and get the right assessment. It should not prescribe a hormone treatment.
When should a rider seek medical assessment?
Arrange assessment for persistent or worsening symptoms that affect daily function, or for more specific endocrine signs such as:
- major menstrual change, heavy bleeding or postmenopausal bleeding;
- reduced libido, erectile dysfunction or loss of spontaneous erections;
- unexplained hot flushes outside the expected menopause context;
- marked cold intolerance, bowel, skin or weight changes;
- recurrent fractures or bone stress;
- symptoms after significant head injury;
- persistent severe thirst or urination; or
- a combination of fatigue with neurological, visual or other systemic symptoms.
Seek urgent care for chest pain, fainting, severe breathlessness, acute neurological symptoms or rapid deterioration. Do not use a hard ride to test medical safety.
What the Roadman app can—and cannot—do
The app can combine:
- symptoms and daily function;
- training load and response;
- sleep and illness;
- energy availability and weight change;
- menstrual or sexual context when the rider chooses to record it;
- laboratory date, units, interval and sample conditions; and
- the clinician's follow-up plan.
That creates a better timeline than scattered screenshots and isolated readiness scores.
It cannot diagnose hypogonadism, thyroid disease, adrenal disease, growth-hormone deficiency, menopause or REDs. It cannot prescribe HRT, TRT or supplements, and it cannot determine anti-doping permission.
Roadman is building a trusted context layer around training—not a hormone clinic. Join the single app waiting list for launch access.
The Roadman decision
Hormones are part of the athlete, not an explanation for every bad ride.
Use the broad overview to find the right specialist question. Test only when the result can change a qualified decision. Keep training, fuelling and recovery fundamentals strong while medical diagnosis and treatment stay with the people licensed to do them.