Bones, Tendons and Ligaments: Structures That Must Withstand Force - Episode 2: Bone Mineral Density and Strength Sports

Introduction - bone mineral density matters, but it is not the whole story

Bone mineral density, BMD, is one of the best-known variables in skeletal health. It is measurable, can be followed over time, and has an established relationship with fracture risk. For a strength athlete, however, BMD must be placed inside a larger model. Bone is not simply a block of mineral, and its resistance cannot be reduced to a single number. Structural strength emerges from the interaction of mineral quantity, tissue distribution, geometry, cortical thickness, microarchitecture, collagen properties, mineralization, remodeling, and loading history. An athlete may have favorable BMD and still not be protected from every type of injury because bone is continuously balancing mechanical demand with repair.

Episode 1 followed the way bone detects loading and how osteocytes turn deformation into biological signaling. This episode focuses on one measurable variable, mineral density, and on the imaging method most commonly used to assess it, DXA. We will move from measurement physics to adaptation biology and then to strength-sport applications. For Strongman, the central idea is that a strong skeleton is not simply a dense skeleton. It is a structure capable of carrying, distributing, and recovering from large and changing forces. In 2023, ISCD reaffirmed DXA as a central tool for BMD assessment while emphasizing correct interpretation of T-scores, Z-scores, skeletal sites, and serial change.

1. What is bone mineral density?

Bone mineral density describes the amount of mineralized bone represented within a measured region. In clinical practice, the most common method is dual-energy X-ray absorptiometry, DXA. The principal output is areal BMD, usually expressed in g/cm². The first important subtlety is that DXA BMD is not the same as volumetric density. The scanner creates a two-dimensional projection of a three-dimensional structure and estimates mineral content across the projected area. As a result, two bones with similar volumetric tissue properties can produce different areal BMD values when their size or geometry differs.

This matters for strength athletes. Very large bodies, longer bones, unusual anthropometry, and different cross-sectional dimensions can influence the result. DXA should not be dismissed because of this. It remains highly useful, especially when scans are technically sound and interpreted appropriately. The problem begins when the number is detached from its limitations and treated as if it were a complete measurement of skeletal strength.

1.1. Why BMD is not the same as bone strength

Fracture resistance depends on several scales of organization. At the whole-bone level, shape and material distribution matter. At the tissue level, cortical and trabecular architecture matter. At the material level, collagen and mineral contribute different mechanical properties. At the biological level, remodeling, osteocyte function, vascular supply, and repair capacity influence tissue integrity. Hart and colleagues emphasized that bone strength depends not only on bone material but also on bone structure and muscle action.

That is why two people with similar BMD can still have different mechanical behavior. A femur that places more material farther from the bending axis may have a structural advantage compared with a femur containing a similar amount of mineral in a different geometry. BMD tells us how much mineral is represented in a projected region. It does not tell us exactly where every gram is placed or how the complete three-dimensional structure is organized.

2. How does DXA work and what does the scanner actually see?

DXA uses two X-ray energy levels and exploits differences in attenuation between soft tissue and mineralized bone. Mathematical modeling allows the system to estimate bone mineral content and projected area. The resulting BMD can then be expressed alongside T-scores and Z-scores depending on age and clinical context. ISCD recommends T-scores for specified adult populations and Z-scores for premenopausal women and men younger than 50, with age-appropriate interpretation.

For athletes, consistency is crucial. A change in acquisition conditions, scanner, positioning, or analysis can influence longitudinal comparison. A useful scan is therefore not simply an impressive number. It is a measurement that can be compared meaningfully with previous measurements. ISCD stresses precision error and least significant change when serial BMD is interpreted, which helps prevent small fluctuations from being mislabeled as true bone gain or loss.

2.1. Why bone size can influence interpretation

Because DXA reports areal density, bone size influences the mathematical relationship between mineral and projected area. This deserves attention in very tall or very large strength athletes. Volumetric methods such as QCT can add three-dimensional information about cortical and trabecular compartments. They are especially useful in research and in advanced clinical questions, while central DXA remains the principal method for many routine skeletal assessments.

3. Cortical versus trabecular density

Cortical bone forms the dense outer shell of many bones and is a major contributor to stiffness and structural strength, especially in long bones. Trabecular bone is an internal three-dimensional network of plates and rods that align along major force paths. The two compartments have different architectures and different patterns of adaptation. They are not competing definitions of bone strength. They are complementary parts of one load-bearing system.

In Strongman, this distinction becomes especially interesting because loading is mixed. A squat, deadlift, yoke, frame carry, or overhead event creates different combinations of compression, shear, bending, and torsion. No skeletal site receives the same stimulus as every other site. Global BMD therefore cannot fully represent these local differences. Adaptation remains site-specific and depends on the type, magnitude, and history of mechanical exposure.

4. How can strength training increase BMD?

Resistance training can support bone adaptation because it creates repeated mechanical loading that changes the environment sensed by osteocytes. When bone deformation is sufficiently meaningful, osteocytes alter signaling pathways that regulate formation and resorption. Sclerostin signaling and the Wnt/β-catenin system are part of this response. Over time, repeated loading may favor formation and maintenance of bone tissue.

Meta-analyses support beneficial effects of resistance exercise on BMD in several populations, including adults with low bone mass, although the magnitude of the effect varies by skeletal site, protocol, and participant characteristics. A meta-analysis of high-load resistance training in osteoporosis and osteopenia reported significant effects, especially at the lumbar spine, while also showing high heterogeneity and potential publication bias. The correct practical conclusion is therefore not that every heavy program increases BMD equally, but that appropriately dosed resistance exercise is a credible osteogenic stimulus.

4.1. Why athletes do not respond identically

Bone response depends partly on the starting point. A novice may have considerable adaptive room, while an athlete with decades of training may already be close to the response allowed by genetics, body size, hormonal environment, and loading history. Age, sex, maturation, body mass, energy availability, and endocrine status also contribute. And the skeleton does not respond only to how much weight is lifted. It responds to how force is transmitted through the body.

5. Why can strength sports produce skeletons different from the general population?

Sports that heavily load the skeleton are often associated with more favorable skeletal characteristics than those observed in sedentary or low-loading populations. Yet the label strength sport hides meaningful differences. Gymnastics, jumping sports, powerlifting, weightlifting, and Strongman expose bone to different mixtures of force magnitude, acceleration, repetition, and site-specific loading. The safest conclusion is therefore that chronic mechanical exposure is a major driver of skeletal adaptation, not that every strength athlete will develop identical bones.

5.1. Powerlifting, weightlifting, and Strongman do not load bone identically

Powerlifting uses highly standardized lifts and very large external loads. Olympic weightlifting adds a substantial velocity component and rapid force transfer. Strongman combines irregular objects, variable centers of mass, walking under load, yokes, stones, logs, axles, and other events that change the position of the external load relative to the body. There is not enough evidence to claim one discipline produces universally superior bones. There is, however, a clear biomechanical reason to view Strongman as a highly diverse loading environment.

Variety is not automatically protective. It can broaden the mechanical repertoire presented to the skeleton, but it can also introduce new stress concentrations. An unusual implement can alter how the tibia, femur, spine, shoulder girdle, or forearm receives force. Skeletal adaptation therefore has to be understood through the athlete's actual events and technique, not merely through the name of the exercise.

6. BMD and body mass - mechanical advantage or confounder?

Body mass is one of the main sources of daily mechanical loading. A heavier body generally produces larger loads on the lower limbs and spine during gait and ordinary activity. In strength sports, increased body mass is often accompanied by increased muscle mass, which adds internal force as well as external weight. The relationship between body mass and BMD is therefore neither purely causal nor merely statistical noise. It reflects an interaction among size, muscle, and mechanical demand.

This becomes especially relevant when large strength athletes are compared with general-population reference data. A higher BMD in a very large athlete may partly reflect the greater mechanical demand associated with carrying that body. That does not make mass the only cause, nor does it mean that heavier is automatically better. It means that the skeleton is part of a biomechanical system.

7. BMD, muscle hypertrophy, and the muscle-bone relationship

Muscle and bone are closely coupled mechanobiological tissues. When a muscle becomes stronger, the tendon can transmit larger forces to its attachment sites. Those forces alter local bone strain and may provide a substantial mechanical stimulus. Reviews of bone strength explicitly include muscle action among the key contributors to skeletal mechanics. citeturn581869search0

But hypertrophy does not guarantee a proportionate increase in BMD. A bodybuilder and a powerlifter may have similar muscle mass in a region and still expose their bones to different combinations of load magnitude, velocity, impact, and repetition. Muscle size, force production, range of motion, and loading pattern interact but are not interchangeable. The muscle-bone relationship is strong, yet it is not linear.

8. How does mineral density adapt to chronic loading?

Bone adaptation is relatively slow. Molecular signaling, osteoblast and osteoclast activity, and remodeling can change before DXA detects a clear difference in BMD. This is why a strength athlete should not expect a visibly different density result after a few weeks of training. The tissue is responding, but some of the response occurs on a timescale that imaging does not immediately reveal.

A 2026 network meta-analysis of resistance exercise in middle-aged and older adults found that different intensity and frequency combinations ranked differently depending on the skeletal site. Some interventions improved selected BMD outcomes, while several between-group differences were not statistically significant. The broader message is that bone adaptation is real but not governed by one universal prescription.

9. Why mechanical loading is region-specific

One of the most reliable principles in bone biology is site specificity. A vertebra does not receive the same force pattern as the radius. The proximal femur does not experience the same mixture of stress and strain as the tibia. In Strongman, the line of force and the moment arm can change when the athlete performs a yoke, stone load, or carry. There is therefore no single thing called whole-skeleton loading. There is a landscape of local mechanical environments.

Specificity also means that two apparently identical techniques can create different local forces. Grip width, trunk angle, walking strategy, elbow position, and implement placement all matter. This is why advanced skeletal thinking must connect BMD with actual biomechanics instead of treating the exercise label as a sufficient description of load.

9.1. Why the spine and hip should be considered separately

The lumbar spine and hip are clinically important skeletal regions, but they do not respond identically to loading. Vertebral bodies contain substantial trabecular bone, while the proximal femur combines cortical and trabecular structures arranged around complex force paths. A training program can therefore produce different responses at different sites. Degenerative changes, osteophytes, positioning, and other artifacts can also complicate spine DXA interpretation. ISCD provides specific rules for excluding vertebrae that are structurally abnormal or technically unsuitable.

10. When BMD is high, injury risk does not disappear

A robust bone is not an indestructible bone. Mechanical loading creates deformation and, at times, microscopic damage. Under normal conditions, repair and remodeling preserve integrity. Problems arise when damage accumulation outpaces repair. Stress injuries are a good example because cumulative exposure can matter more than a single snapshot of BMD. In strength sports, rapid increases in volume, new events, repetitive loading, or poor recovery can shift the balance.

This distinction is crucial in Strongman. An athlete may tolerate a rare maximal load extremely well and still develop a problem after several weeks of repeated events that concentrate stress in the same region. BMD does not directly record repetition count, loading frequency, speed of force application, or the recovery status of the athlete in a given week.

11. Microarchitecture - the invisible component BMD can miss

Trabecular bone is better understood as an engineered network than as uniform mineral. Plate thickness, number, connectivity, and orientation all contribute to mechanical behavior. Two networks can contain similar quantities of material and still differ mechanically if one has lost connections or has become less efficiently aligned with force paths. DXA cannot resolve these details at the microscopic level. Techniques such as HR-pQCT can provide substantially richer information about microarchitecture, particularly in research settings.

For the strength athlete, this matters because it exposes the difference between describing a tissue and describing its full structure. Saying that a skeleton has good BMD is useful. Saying that the skeleton is therefore mechanically optimized would be an overreach. Material, geometry, microarchitecture, and loading history still belong in the model.

12. Collagen and material quality

Bone is a composite material made from organic matrix and mineral. Type I collagen contributes to toughness and the ability to tolerate deformation, while mineral contributes strongly to stiffness. The interaction among these components influences the tissue's resistance to cracking and crack propagation. This is one reason modern bone science distinguishes bone quality from BMD. BMD captures an important part of mineral quantity, but it does not exhaust material quality.

The distinction becomes particularly useful when discussing aging and metabolic disorders. A tissue may maintain a certain density while changes in collagen, microscopic damage, or architecture alter mechanical performance. In healthy strength athletes, the practical message is not that DXA is inadequate, but that DXA should be placed in the same conversation as material and structural mechanics.

13. Strongman and bone mineral density - what is special here?

Strongman is particularly interesting because the loading environment is diverse. A barbell deadlift, yoke carry, and sandbag carry can use similar nominal masses and still produce very different mechanical conditions. A shifted center of mass changes moment arms. Walking under load introduces repeated loading over time. Stones and sandbags combine lifting with compression and instability. The log changes where the external load sits relative to the trunk and shoulders. The result is a rich mechanical repertoire.

There is not enough sport-specific evidence to claim that Strongman automatically produces the highest BMD of all strength disciplines. The stronger conclusion comes from biomechanics: Strongman exposes the skeleton to many different loading configurations, and that can be a meaningful stimulus for adaptation. The same diversity also demands careful progression because new implements can create new stress concentrations.

14. Energy availability, hormones, and BMD in athletes

Bone does not operate independently of whole-body metabolism. Low energy availability means that, after the energy cost of exercise is accounted for, too little energy remains to support normal physiological function. The IOC REDs consensus describes low energy availability as a continuum that can produce system-wide health and performance consequences, including skeletal effects when it becomes problematic.

This is particularly relevant to strength athletes during weight cuts, dieting phases, or periods of intentionally restricted intake. A mechanically excellent training program cannot indefinitely override an unfavorable biological environment. When energy availability, endocrine function, sleep, or nutrient intake become inadequate, the bone may pay a delayed price even while short-term performance appears relatively stable.

15. Calcium and vitamin D - necessary, but not substitutes for loading

Calcium is an essential mineral component of bone, while vitamin D contributes to calcium homeostasis and normal muscle and skeletal function. Adequate intake supports normal physiology, but supplementation is not a substitute for mechanical loading. A lifter cannot create strong structural adaptation simply by increasing a micronutrient when the mechanical stimulus is missing. Conversely, very high loading in a poorly nourished or deficient state can create a mismatch between demand and biological support.

Evidence from calorie-restriction settings illustrates the interaction. Exercise added to an energy-restricted diet does not guarantee preservation of all BMD measures, but resistance exercise can provide a relative benefit compared with calorie restriction alone. Nutrition creates the conditions for adaptation; loading provides the mechanical information. Neither component can be treated as the whole equation.

16. BMD during growth and young adulthood

Childhood and adolescence are critical periods for skeletal development because bone size, mineralization, and architecture are changing simultaneously. Physical activity and sport can contribute to building a favorable structural foundation. This is one reason the history of activity during youth can matter later in adulthood. The principle should not be confused with a license for inappropriate training in children. Mechanical exposure must match maturation, skill, and safety.

In young adulthood, achieving a high level of bone mass and maintaining loading remain relevant. Yet peak bone mass is not the end of the story. Remodeling continues throughout life, and changes in activity, nutrition, hormones, and age can alter the balance. A strong skeletal foundation is an advantage, not a permanent exemption from maintenance.

17. Aging, BMD, and the master strength athlete

With aging, bone mass and aspects of cortical and trabecular architecture may decline. Loss is not, however, a purely passive process. Resistance exercise remains important for maintaining muscle, function, and a meaningful mechanical stimulus. A 2026 meta-analysis found that resistance training clearly improves strength in older adults, while differences between high and lower intensities for BMD were less consistent. That is a useful reminder that maximal loading is not automatically synonymous with optimal bone loading.

For a master Strongman, experience can be an asset because technique and load management are often better. But experience does not cancel biology. Recovery may take longer and structural tissues may adapt more slowly. The target is not permanent reduction of training stress. The target is enough training stress, applied consistently, inside a recovery envelope the athlete can actually sustain.

18. What happens to BMD after detraining?

Prolonged mechanical unloading can reduce bone mass and alter turnover. Immobilization and microgravity are extreme examples. A normal deload should not be confused with these conditions, but a long absence of meaningful loading can reduce the stimulus that maintains certain skeletal adaptations. This is one reason return to training after injury or extended inactivity should be gradual even when muscular strength returns quickly.

The practical problem is a mismatch between performance memory and tissue readiness. An experienced athlete can regain technical skill and force output rapidly. The bone may not have rebuilt its tolerance to the same exposure at the same rate. Jumping from detraining directly back to old event volumes can therefore create a structural bottleneck that is invisible during a single strong training session.

19. Why BMD should not be monitored obsessively

A useful biomarker becomes less useful when it is measured without a clear question. In healthy athletes, very frequent DXA scans do not necessarily provide meaningful information because small changes can fall within measurement uncertainty while bone itself changes slowly. ISCD recommends that serial assessment take precision error and least significant change into account.

For performance athletes, BMD should sit inside a wider monitoring system. Training history, body mass, nutrition, energy availability, sleep, pain, changes in performance, and clinical evaluation can all add information. The right question is not how to collect the largest pile of data, but how to collect data that changes a decision.

20. How should BMD be interpreted in a Strongman athlete?

The first question is whether the result is technically valid and interpreted with the correct age framework. The second is whether there are factors that could explain a low value or an unexpected decrease. The third is whether the athlete's loading history and biological environment are consistent with normal adaptation. In men younger than 50, for example, Z-scores are preferred for reporting and osteoporosis cannot be diagnosed from BMD alone. In older adults, T-scores have a different role. These distinctions are clinically important.

Then comes biomechanics. What events does the athlete repeat? How often? At what intensities? With what positions and implements? A favorable BMD should not override a new persistent pain syndrome. Conversely, a modest BMD value that remains appropriate for age and clinical context should not automatically be treated as a performance emergency. Interpretation requires integration.

21. BMD and stress fracture - why the relationship is not perfect

Stress fractures occur when repetitive loading and microdamage outpace the bone's ability to repair. BMD can contribute to risk assessment, but it cannot replace exposure analysis. An athlete with good BMD can still develop a stress injury after a sudden increase in volume, a new event, or repeated loading in a vulnerable position. Similarly, an athlete with lower BMD than the average population may never develop a stress fracture if loading is appropriate and the biological environment is favorable.

Strongman creates two especially interesting categories of exposure. The first is peak intensity, where a large load is lifted in an unusual position. The second is cumulative stress, where a region receives repeated loading until damage begins to outpace repair. BMD does not separate these mechanisms. Programming and symptom monitoring do.

22. What can a well-designed program do for the skeleton?

A well-designed training plan can provide enough mechanical stimulus to promote adaptation without turning every session into a test. Important variables include load magnitude, frequency, repetition, movement speed, and regional distribution. For bone, progression is as important as absolute intensity. A slightly larger load introduced after adaptation can be a powerful signal. The same load introduced abruptly after a long break can become a problem.

In Strongman, event scheduling matters because yoke, frame carry, stones, deadlift, and pressing events can accumulate stress in overlapping regions. The program has to consider cumulative exposure rather than simply counting kilograms. An unstable 180 kg implement can create a different mechanical challenge from 180 kg on a balanced barbell. The load number alone does not describe the skeletal environment.

23. The relationship among BMD, geometry, and actual bone strength

The most useful mechanical lesson from this episode is that bone strength is an emergent property. BMD contributes to it, but does not define it. Geometry changes the section properties that determine resistance to bending. Cortical and trabecular architecture influence load transfer. Collagen and mineral shape the behavior of the tissue material. Loading history modifies these characteristics within a living organism.

This explains why two people with similar DXA results can still show different mechanical performance. When the question is simply how much mineral is present in a defined region, BMD is a strong answer. When the question becomes how much real structural reserve the skeleton has, the model must expand to include geometry, microarchitecture, material quality, and loading history.

24. What does all of this mean for strength-athlete longevity?

Longevity is not created by avoiding loading. Bone needs loading to remain adapted. The critical issue is whether the mechanical stimulus matches the tissue's capacity. A durable plan keeps the stimulus high enough to support adaptation while keeping the dose compatible with repair. Sleep, nutrition, energy availability, and pain management belong to the same equation.

For Strongman, this means performance and skeletal health do not have to be enemies. When loading is progressed intelligently, they can reinforce one another. A strong athlete who accumulates years of adaptation without chaotic spikes can turn strength training into a stimulus for musculoskeletal longevity rather than a recurring gamble.

25. Conclusion - density is an indicator, not a verdict

Bone mineral density is one of the most useful measurements in skeletal health, and DXA is a central, standardized clinical tool. But BMD is not a synonym for bone strength. It is a measurement of one property at one site using a technique that projects a three-dimensional structure into an areal result. Actual strength also depends on geometry, microarchitecture, tissue material, and mechanical history.

For strength athletes, the practical conclusion is even more useful. Mechanical loading is a powerful biological stimulus, but only when it fits the athlete's capacity to recover. Muscle produces force, tendon transmits it, bone distributes it, and osteocytes convert deformation into signaling. What we call a strong skeleton is the outcome of all these levels working together.

The better question for a Strongman is therefore not only, “What is my BMD?” It is, “How well is my skeleton adapted to the demands I place on it, given my mechanical history, recovery capacity, and biological environment?” That question leads naturally into the next episodes, where we move from bone to tendon and ligament.

Scientific bibliography

1. International Society for Clinical Densitometry. Official Positions 2023. ISCD. 2023.

2. Hart NH, Nimphius S, Rantalainen T, Ireland A, Siafarikas A, Newton RU. Mechanical basis of bone strength: influence of bone material, bone structure and muscle action. Journal of Musculoskeletal and Neuronal Interactions. 2017;17(3):114-139. PMID 28860414.

3. Hughes JM, Castellani CM, Popp KL, et al. The Central Role of Osteocytes in the Four Adaptive Pathways of Bone's Mechanostat. Exercise and Sport Sciences Reviews. 2020;48(4):231-240. PMID 32568926.

4. Plotkin LI, Bellido T. Osteocyte Mechanobiology. Annual Review of Physiology. 2016;78:563-587.

5. Miyakawa M, et al. Impact of high-load resistance training on bone mineral density in osteoporosis and osteopenia: a meta-analysis. Osteoporosis International. 2021. DOI 10.1007/s00774-021-01218-1.

6. Cui H, Li Y, Jiang J, Gao J. Effects of exercise based on ACSM recommendations on bone mineral density in individuals with osteoporosis: a systematic review and meta-analyses of randomized controlled trials. 2023.

7. Zhang W, et al. Optimal Resistance Exercise Strategies for Improving Bone Mineral Density in Middle-Aged and Older Adults: A Network Meta-Analysis Based on Exercise Intensity and Frequency. Calcified Tissue International. 2026. DOI 10.1007/s00223-026-01578-8.

8. Chen A, Guo C, Zhou Y. Effects of resistance training on preventing muscle atrophy and bone loss in simulated weightless population: a systematic review and meta-analysis. Frontiers in Physiology. 2025;16:1694891.

9. Mountjoy M, Sundgot-Borgen J, Burke L, et al. IOC consensus statement on Relative Energy Deficiency in Sport (REDs): 2023 update. British Journal of Sports Medicine. 2023;57:1073-1097.

Advanced analysis - mineral density within the model of skeletal performance

1. BMD is the result of history, not one training session

A BMD result should be read as the outcome of a biological history. Age, maturation, activity during childhood, years of training, body mass, hormones, nutrition, and periods of inactivity have all contributed to the value that is measured today. One heavy session can provide a mechanical signal, but it cannot rewrite bone architecture in a few hours. That difference in timescale is fundamental. In sport, performance can change from week to week, while skeletal structure changes slowly.

For Strongman, skeletal health should therefore be considered longitudinally. A competition may create a temporary peak of loading, but resilience comes from the months and years of preparation that built the capacity to tolerate that peak. An experienced athlete is not strong because one enormous weight was lifted once. The athlete is strong because the organism has encountered large forces repeatedly and had time to adapt.

2. Why the same BMD can hide different structures

Two identical BMD values do not imply two identical bones. An areal measurement cannot fully describe cortical distribution, trabecular orientation, or material properties. In structural mechanics, where material is placed can be as important as how much material exists. When material is positioned farther from a bending axis, structural resistance can increase without a proportional increase in total material. Geometry is therefore a partner of BMD, not a minor detail.

This is especially relevant in athletes with unusual anthropometry. A very tall, very large Strongman should not be interpreted using the same simplistic expectations as a sedentary person of average body size. The number still matters, but it has to be understood in the context of structure and the purpose of the examination.

3. When high BMD helps and when it does not solve the problem

A favorable mineral density is clearly useful. More mineral can contribute to stiffness and material strength. But fracture resistance is a property of the whole structure. Bone has to absorb energy, distribute force, and limit crack propagation. If loading exceeds these capacities, density by itself cannot protect the tissue from failure.

For strength athletes, this distinction helps prevent a common psychological error: treating a good DXA result as permission to ignore pain or increase volume without limits. A favorable BMD should provide information and context, not erase all the other signals produced by the body.

4. Axial loading, bending, and torsion

A Strongman skeleton is exposed to more than one type of force. Yoke work and carries contain an important axial component. Deadlifts and squats combine compression with bending. Asymmetric movements can add torsion and shear. Each loading mode creates a different distribution of stress and strain. This helps explain why an event that looks easier by external weight can still be more demanding for a particular structure.

A useful training model therefore cannot reduce everything to tonnage. Tonnage is valuable for describing part of training volume, but it does not fully capture force vectors, moment arms, and local repetition. In Strongman, the biomechanics of the implement can matter almost as much as its mass.

5. Why a new implement can be a new stimulus for bone

When an athlete changes implements, the exercise changes in more than name. The center of mass, load path, joint position, and speed of force application may all change. The bone therefore encounters a different mechanical environment. From the perspective of mechanotransduction, that novelty can be relevant because bone is sensitive to changes in loading. Yet novelty should never be introduced recklessly.

A new implement should initially be used with controlled volume and intensity. The objective is to establish technique and tissue tolerance before turning the movement into a high-intensity event. This is especially important for very large implements where body position may change considerably from repetition to repetition.

6. Why BMD should not be a daily progress metric

BMD does not provide rapid feedback. Measuring it too often mostly creates noise and very little useful information. Daily athlete monitoring should rely on signals that respond rapidly to training: performance, pain, fatigue, sleep, readiness, and tolerance to volume. BMD has a different role. It is more appropriate for health questions and for serial assessment at intervals long enough for meaningful change to become detectable.

ISCD recommends interpreting serial differences in relation to precision error and least significant change. A strength athlete therefore should not redesign a good program because a scan is a small fraction different from the previous scan.

7. BMD, aging, and maintaining a long career

As an athlete ages, maintaining muscle mass, strength, mobility, and meaningful mechanical exposure becomes increasingly important. There is no requirement, however, to use exactly the same absolute intensity forever. A master athlete can obtain an adequate stimulus from a well-designed volume and intensity without turning every session into a copy of peak-career training.

This is the difference between preserving a career and trying to recreate adolescence indefinitely. Bone needs stimulus, but it also needs time to repair. With age, management becomes more important, and experience should be used to adjust the dose rather than to deny biological change.

8. Why Strongman should not chase one isolated bone quality

The sport demands several properties at once: tolerance of axial load, force transfer through the limbs, tolerance of impact and carrying, control of posture under load, and resilience to repeated stress. None of these is completely represented by BMD. A good program is therefore not one that creates “dense bones” in the abstract. It is one that develops a musculoskeletal system adapted to real demands.

Within that model, BMD becomes a health indicator while mechanics becomes the language used to understand adaptation. This connects naturally to the next episodes about tendons and ligaments: bone does not work alone. Force travels through a chain of tissues, and each tissue has its own rate and limits of adaptation.

A long Strongman career is therefore not a contest between doing more and doing less. It is a contest between well-dosed loading and uncontrolled loading. Bone responds to demand, but the response is slow, local, and dependent on biological context. BMD lets us see part of the outcome. The rest must be understood through structure, mechanics, and history.