Work surfaces, flooring and physical fatigue: an invisible factor that affects feet, knees and back

Superficies de trabajo, suelo y fatiga física: un factor invisible que afecta a pies, rodillas y espalda

When discussing ergonomics in jobs that require standing, people almost always think about posture or the amount of time spent without sitting down. However, one of the most decisive and least visible factors is the floor you work on.
Its hardness, the type of material, and the lack of cushioning directly influence the load placed on the feet, knees, and spine throughout the working day.

Evidence in occupational risk prevention shows that working for eight hours on a rigid floor is not the same as working on a surface with some impact-absorbing capacity, even when maintaining the same posture and the same footwear.

1) Why the floor matters more than it seems

Every step generates an impact force that travels upwards from the foot (known in biomechanics as the kinetic chain).
When the floor is very rigid (concrete, stoneware, steel, industrial ceramic), that force is transmitted almost entirely to the body.

Organisations such as the INSST and EU-OSHA describe hard flooring as an ergonomic risk factor when the job involves prolonged standing.

2) Effects of hard flooring on the body

A) Feet: plantar overload

  • greater pressure on the heel and forefoot

  • fatigue in the intrinsic foot muscles

  • increased discomfort in the plantar fascia

Ergonomics studies show that repeated impact on rigid surfaces increases plantar fatigue, even in the absence of significant movement.

B) Knees: accumulated joint load

  • increased compression forces

  • reduced natural “shock absorption” capacity

  • fatigue in the quadriceps and hamstrings

Occupational health literature links prolonged exposure to hard flooring with persistent knee discomfort, especially when combined with static postures.

C) Lower back: repeated micro-impacts

  • direct transmission of impact to the lower back area

  • greater muscle stiffness

  • a feeling of a “heavy back” at the end of the shift

The UK HSE and the Canadian CCOHS point out that the physical environment (including the floor) influences the risk of musculoskeletal disorders, not just posture.

3) Sectors where the floor is a critical factor

The impact of the floor is especially pronounced in:

  • hospitals and healthcare centres

  • kitchens and hospitality

  • industry and logistics

  • professional cleaning

  • retail with fixed counters

In many of these environments, flooring is prioritised for hygiene or durability, not for ergonomics, which makes it even more important to offset that impact in other ways.

4) What measures really help reduce fatigue caused by hard floors

A) Anti-fatigue mats (when the workstation is fixed)

The evidence shows that:

  • they reduce plantar pressure

  • they reduce muscle fatigue

  • they improve perceived comfort

Especially useful in roles where the person remains in a specific area for hours.

B) Introduce variation in posture and movement

Even if the floor is hard:

  • shift weight

  • walk short distances

  • alternate tasks

reduces the accumulated load.

C) Footwear suited to the type of surface

Without going into brands, the most relevant criteria according to workplace ergonomics are:

  • soles with impact-absorbing capacity

  • stability (without excessive rigidity or instability)

  • good pressure distribution

  • sole adapted to the type of floor surface (smooth, wet, industrial)

NIOSH and HSE emphasise that footwear is a complementary measure, not the only one, but a key one when the floor surface cannot be modified.

5) Why this factor is often overlooked

The floor surface:

  • is not perceived as “posture”

  • is not directly associated with pain

  • is usually a structural decision of the building

However, from a prevention perspective, it is an environmental factor that acts every minute of the working day.

Conclusion

Working standing up on a hard floor surface is not harmless. Although it does not always cause immediate pain, the cumulative load on the feet, knees and back is real and measurable.
Modern ergonomics insists on addressing the problem through the environment: surfaces, work organisation, movement and appropriate equipment.

Understanding the role of the floor surface helps explain why, in many cases, fatigue does not depend only on “enduring more”, but on reducing invisible impacts that are repeated thousands of times a day.

Sources consulted

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