Peak Physiology | Occupational health and injury prevention for Hunter businesses
Almost every industrial business in the Hunter has run manual handling training. Many run it annually. Workers can recite the principles: bend the knees, keep the load close, avoid twisting, get help with heavy items.
And the injuries keep happening.
This is not a failure of the workers and it is usually not a failure of the trainer. It is a predictable result of relying on a control that sits near the bottom of the hierarchy to manage a risk that is built into the design of the work.
What the evidence actually says
This is uncomfortable for an industry that sells training, but it needs saying plainly: the research evidence that manual handling technique training alone reduces injury rates is weak. Multiple systematic reviews across decades have found little to no sustained reduction in back injury from training-only interventions. Where reductions have been reported, they have generally come from programs that also changed the task, the load, the equipment or the work organisation.
That does not make training worthless. Training builds hazard awareness, gives workers a shared language for raising problems, and is a genuine legal obligation. But if training is the only control in place, the risk has not been managed. It has been transferred to the worker.
Why technique fails in the real world
Technique training assumes the worker has a choice about how to perform the task. On a real site, they frequently do not.
The environment does not allow it. You cannot keep the load close if you are reaching over a bench. You cannot avoid twisting if the pallet is behind you and the racking is in front. You cannot get in a good position if there is no room to stand.
The load does not cooperate. Awkward shapes, unstable contents, no handholds, and unpredictable weight distribution all defeat good technique regardless of intent.
Time pressure overrides it. When the truck is waiting, the correct method loses to the fast method. Every time. This is not a discipline problem, it is a design problem.
Fatigue erodes it. Technique is a motor skill, and motor skills degrade as muscles fatigue. The lift at hour nine is not the lift that was demonstrated in the training room.
Nobody lifts like the poster. Observational studies consistently find that trained workers revert to their previous movement patterns within weeks. Under load, under time pressure, people move the way their body has learned to move.
The four risk factors that actually drive injury
The SafeWork NSW approach to hazardous manual tasks focuses on the characteristics of the task rather than the technique of the worker. Four factors do most of the damage:
Force. How hard the body has to work. This includes lifting and lowering, but also pushing, pulling, carrying, holding and restraining. Sustained force with no movement — holding a tool overhead, gripping a trigger — is often more damaging than a single heavy lift, because there is no relief phase for the tissue.
Repetition. How often the movement is performed. Tissue tolerates load and recovers. Remove the recovery window and the same load becomes an injury mechanism. A five kilogram lift repeated four hundred times a shift is a serious exposure; most risk assessments would not flag it because five kilograms sounds trivial.
Awkward posture. Working outside neutral joint positions. Reaching overhead, bending forward, twisting, kneeling, working with the arms extended away from the body. The further from neutral, the higher the internal load on the joint and surrounding tissue for the same external weight.
Duration. How long the exposure continues, both within a shift and across a working life. Duration is the factor most often left out of assessments, and it is frequently the one that turns a manageable task into a harmful one.
These factors multiply rather than add. A moderate load, repeated often, in a twisted posture, for a full shift, is a serious risk even though no single element looks alarming in isolation.
The injury usually starts long before the pain
This is the point that matters most for supervisors.
Musculoskeletal injury from manual work is rarely a single event. Cumulative tissue loading produces microtrauma that builds over weeks or months. The tissue adapts if given recovery, and accumulates damage if not. The person feels nothing for a long time, then feels stiffness, then soreness that eases overnight, then soreness that does not.
By the time someone reports pain, the underlying process has usually been running for a considerable period. This is why an injury so often gets attributed to a routine lift the worker has done a thousand times. That lift was not the cause. It was the point at which accumulated loading exceeded tissue tolerance.
The practical implication: if you wait for a pain report to trigger action, you are intervening at the end of the process rather than the start.
What actually reduces manual handling injuries
Work through the hierarchy properly.
Eliminate. Does the task need to be done at all? Does the item need to be moved by hand, at that point, in that sequence? A surprising number of manual handling tasks exist because of an upstream decision nobody has revisited — a delivery arrangement, a storage location, a packaging choice.
Substitute and engineer. Smaller pack sizes. Lighter containers. Mechanical aids that are actually available where the task happens, not stored two hundred metres away. Height-adjustable benches. Trolleys with wheels appropriate to the floor surface. Changing storage heights so the heaviest items sit between knee and shoulder rather than on the floor or above the head.
Change the work organisation. Job rotation that genuinely varies the loaded tissue rather than moving people between two similarly demanding tasks. Realistic time allocation. Two-person allocation for tasks that require it, with the staffing to make it possible.
Administrative controls and training. Procedures, training, warm-up programs. These have a place, and they are the layer most businesses start and stop at.
PPE. Back belts are not a control. The evidence does not support them for injury prevention.
Where to start if you are a supervisor or WHS manager
You do not need a consultant to begin. You need to watch the work.
Go and observe the tasks your workers actually perform, not the tasks the procedure describes. Look for:
- Anyone reaching above shoulder height or below mid-shin repeatedly
- Loads being carried further than a few metres
- Twisting under load
- Tasks where the worker’s body position is dictated by the equipment layout
- Any task where workers have invented their own workaround
- Any task people quietly avoid, or swap out of
That last one is the most useful signal in the building. Workers organise themselves around the tasks that hurt, long before anyone reports anything. Ask which jobs people do not want. The answer is your risk register.
Then talk to the people doing it. Ask what makes the task hard, what they would change, and what they have already tried. In our experience, workers can almost always describe both the problem and the practical fix. What is usually missing is a mechanism for that information to reach someone with the authority to act on it.
Your obligations
Under the Work Health and Safety Regulation 2025 (NSW), a PCBU must manage risks arising from hazardous manual tasks, having regard to postures, movements, forces, duration and repetition, and must apply the hierarchy of control measures. The SafeWork NSW Code of Practice: Hazardous Manual Tasks sets out how to do this in practice, and can be used as evidence of what is reasonably practicable in proceedings.
Training records alone will not demonstrate that a hazardous manual task risk has been managed.
For WHS advice, contact SafeWork NSW on 13 10 50.
Where Peak Physiology fits
We conduct task risk assessments and job demands analyses for Hunter businesses — identifying which specific tasks are driving your injury exposure, and what can practically be changed about them.
If you would like an independent look at one task in your business, we offer a free workplace assessment for local businesses with 15 or more workers. One task or workstation reviewed, one risk concern discussed, and written recommendations you can act on.
Brock McInerney | Accredited Exercise Physiologist | Peak Physiology
