📄 medicine

Androgen-related symptoms are associated with functional vulnerability in midlife men

This cross-sectional study of 329 men reveals that androgen-related symptoms, rather than bioavailable testosterone levels, are independently associated with cognitive and physical performance in midlife men, suggesting these symptoms serve as a critical indicator of functional vulnerability that complements biochemical measures.

Original authors: Dan Keren, Yoel Toledano, Tzipi Strauss, Abigail Goshen, Shmuel Springer

Published 2026-07-20

📖 6 min read🧠 Deep dive

CC BY 4.0

Original authors: Dan Keren, Yoel Toledano, Tzipi Strauss, Abigail Goshen, Shmuel Springer

Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ✨ This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer

The Body's Dashboard: Why Feeling Sick Matters More Than the Gauge

Imagine your body is a high-tech car. For decades, mechanics (doctors) have believed that to know if the engine is running well, you just need to check the fuel gauge. If the needle points to "Full," the car is fine. If it points to "Empty," you have a problem. In the world of human biology, that "fuel" is testosterone, a hormone that helps men build muscle, keep their bones strong, and keep their brains sharp. For a long time, scientists thought that if a man's testosterone levels looked normal on a blood test, his engine was humming along perfectly.

But here's the twist: sometimes the fuel gauge says "Full," but the car is still sputtering, making weird noises, or refusing to start. This is where the concept of "symptoms" comes in. Symptoms are like the dashboard warning lights—the check engine light, the low tire pressure alert, or the temperature gauge creeping up. They tell you something feels wrong right now, even if the fuel gauge looks okay. This new study asks a fascinating question: For men in their "midlife" (roughly ages 40 to 65), is it better to trust the fuel gauge (the blood test) or the dashboard lights (how they feel)? The answer might change how we think about staying healthy as we age.

The Study: Checking the Gauge vs. Listening to the Driver

In this study, researchers gathered a group of 329 men, ranging from 40 to 91 years old. They wanted to see if the amount of testosterone in a man's blood matched how well he could think and move. To do this, they used two main tools:

The Fuel Gauge: They took blood samples to measure "calculated bioavailable testosterone" (cBT). This is a specific calculation of the testosterone that is actually free to do work in the body.
The Dashboard Lights: They gave the men a questionnaire called qADAM. This isn't a blood test; it's a list of questions about how the men feel. Do they have low energy? Is their mood down? Do they feel weak? A higher score on this test means fewer symptoms (feeling great), while a lower score means a heavier burden of symptoms (feeling rough).

They also put the men through a series of challenges to test their "performance." For their brains, they used a computer game to test memory, attention, and problem-solving. For their bodies, they measured how strong their grip was, how fast they could stand up from a chair, how far they could walk in six minutes, and how well they could balance.

The Big Discovery: Two Different Rules for Two Different Ages

The results were like finding out that the rules of the road change depending on which city you are driving in. The researchers found that the relationship between the "fuel gauge" (testosterone) and the "dashboard lights" (symptoms) was totally different for men in their 40s and 50s compared to men in their 70s and 80s.

For the Midlife Men (Ages 40–65):
Here is the surprise: The fuel gauge didn't matter much. Whether a man had high or low testosterone levels in his blood, it didn't predict how well he could think or move. However, the dashboard lights were screaming! The men who reported more symptoms (lower qADAM scores) were the ones who struggled with their memory and physical strength.

The Metaphor: Imagine a midlife driver whose fuel gauge says "Full," but the car is shaking and the engine is knocking. The driver feels terrible. The study found that for these men, the feeling of the engine knocking (symptoms) was a much better predictor of trouble than the fuel gauge. Even though their blood looked normal, the men who felt "off" were the ones actually performing poorly.

For the Older Men (Ages 65+):
The rules flipped. In this older group, the dashboard lights (symptoms) were still linked to how well they could think, but for their physical strength, the fuel gauge became the boss. The men with lower levels of bioavailable testosterone in their blood were the ones who were physically weaker. The symptoms didn't add much extra information here; the blood test was the clear signal.

The Metaphor: For the older driver, the fuel gauge is now the most important thing. If the gauge is low, the car is definitely weak, regardless of what the driver says about how they feel. The physical decline is directly tied to the actual drop in fuel.

What This Means for the "Vulnerable" Midlife Driver

The most exciting part of the story is what it says about men in their 40s and 50s. The researchers noticed something scary: the men in midlife who had the worst symptoms and the worst performance were actually doing worse than the average older man.

The Metaphor: It's like a 50-year-old driver whose car is sputtering so badly that they can't even keep up with a 75-year-old driver in a much older, slower car. This suggests that for midlife men, feeling a decline in energy or mood isn't just "getting older"; it might be an early warning sign of a deeper vulnerability that a standard blood test would completely miss.

The Bottom Line

This study suggests that for men in midlife, we shouldn't just look at the numbers in a blood test. If a man feels tired, unmotivated, or weak, those feelings are real and important, even if his testosterone levels look "normal" on paper. The symptoms are the early warning lights that tell us the engine is struggling before the fuel gauge ever drops.

For older men, the story is a bit different: their physical strength is more directly tied to the actual amount of fuel in the tank. But for the midlife group, the paper strongly suggests that listening to how a man feels is just as important as, and sometimes more important than, the blood test. It's a reminder that the body's dashboard is there for a reason, and sometimes, it's the only way to see the trouble coming.

Technical Summary: Androgen-related Symptoms and Functional Vulnerability in Midlife Men

Problem Statement
While sex hormones are known to regulate musculoskeletal and neurocognitive function, the relationship between androgen bioavailability, androgen-related symptoms, and functional performance in midlife men remains unclear. Unlike the well-defined menopausal transition in women, age-related androgen decline in men is gradual and heterogeneous, making the functional relevance of early hormonal changes difficult to define. Existing literature largely focuses on older cohorts or examines cognitive and physical domains separately, often finding inconsistent associations between circulating testosterone levels and functional outcomes. Furthermore, subjective health appraisals, such as symptom burden, may capture perceived vulnerability not reflected in objective biochemical or performance measures. This study addresses the gap regarding whether early changes in androgen bioavailability and symptom burden are associated with cognitive and physical performance specifically during the critical window of midlife.

Methodology
The study employed a cross-sectional design involving 329 community-dwelling men aged 40–91 years, stratified into middle-aged (40–65 years, n=223) and older (>65 years, n=106) groups. Participants underwent comprehensive assessments including:

Androgen Measures: Fasting morning blood samples were analyzed for Total Testosterone (TT), Sex Hormone-Binding Globulin (SHBG), Dehydroepiandrosterone sulfate (DHEA-S), and albumin. Calculated Bioavailable Testosterone (cBT) and Free Testosterone (cFT) were derived using validated formulas.
Symptom Assessment: Androgen-related symptoms were quantified using the quantitative Androgen Deficiency in the Aging Male (qADAM) questionnaire (scores 10–50; higher scores indicate fewer symptoms).
Cognitive Function: Assessed via the NeuroTrax™ computerized battery, yielding age- and education-adjusted standardized scores for verbal memory, attention, executive function, and a global cognitive score.
Physical Performance: Evaluated through a composite score derived via Principal Component Analysis (PCA) integrating grip strength, sit-to-stand power, six-minute walk distance, Timed Up and Go (TUG) time, and balance (brief-BESTest).
Statistical Analysis: Hierarchical linear regression models were used to evaluate independent associations between androgen markers (cBT, SHBG) and symptom burden (qADAM) with functional outcomes, adjusting for covariates including age, body fat percentage, and physical activity. Logistic regression and analyses of accumulated impairment (deficits in multiple domains) were also conducted.

Key Results
The study revealed distinct, age-dependent patterns in the association between androgen measures and functional outcomes:

Midlife Men (40–65 years):
- Cognition: Androgen-related symptoms (qADAM) were independently associated with global cognitive performance ( $\beta$ = .20, p=.003). Circulating androgen levels (cBT, SHBG) showed no significant association.
- Physical Performance: qADAM was independently associated with the physical-performance composite score ( $\beta$ = .22, p<.001). cBT and SHBG were not independently associated after adjusting for covariates.
- Vulnerability Profile: Middle-aged men in the lowest performance quartile for both cognition and physical function scored lower than the average older men, suggesting a distinct functional vulnerability profile in this subgroup.
Older Men (>65 years):
- Cognition: qADAM remained independently associated with global cognition ( $\beta$ = .25, p=.015), while cBT did not.
- Physical Performance: The pattern shifted; cBT was independently associated with physical performance ( $\beta$ = .21, p=.030), whereas qADAM was not.
- Accumulated Impairment: Similar age-specific patterns were observed when analyzing accumulated deficits across multiple domains. Lower qADAM scores predicted accumulated cognitive and physical impairment in midlife men, while lower cBT levels predicted accumulated physical impairment in older men.

Significance and Claims
The authors claim that androgen-related symptoms reflect a functional vulnerability in midlife men that is not captured by circulating testosterone levels alone. The study suggests that during midlife, when testosterone levels often remain within the normal range, subjective symptom burden may serve as a more proximal signal of early cognitive and physical decline. Conversely, in older men, bioavailable testosterone becomes a more relevant predictor of physical function, likely due to age-related increases in SHBG altering the bioavailability of androgens.

The paper posits that functional evaluations for middle-aged men should integrate the assessment of androgen-related symptoms alongside biochemical measures. This approach aligns with a shift in understanding female menopausal transitions, where symptom burden is increasingly considered alongside hormonal changes. The findings support the utility of symptom assessment for identifying early functional vulnerability before overt clinical decline becomes apparent, particularly in cohorts with preserved baseline function. The study concludes that relying solely on circulating testosterone measures may overlook critical functional deficits in midlife men.