Prescribing Therapeutic Exercise in Musculoskeletal Rehabilitation: How to Adjust Load, Volume, and Frequency
In the previous article, we examined why many patients with persistent musculoskeletal pain do not improve, highlighting factors such as kinesiophobia, limited exposure to movement, and a lack of feedback.
A direct consequence of these problems is insufficient therapeutic exercise. In clinical practice, the problem is not usually which exercise is prescribed, but rather the actual amount of stimulation the patient receives.
This brings us to a central issue in rehabilitation:
How much exercise does a patient really need to get better?
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The actual dosage is usually lower than we think
In many clinical settings, exercise protocols are established using relatively standardized guidelines: number of repetitions, sets, or weekly frequency. However, when one takes a closer look at what actually happens during a session or at home, the reality is often quite different.
The patient performs fewer repetitions than prescribed, takes longer breaks than planned, or reduces the range and quality of motion. In some cases, the patient even stops the exercise before completing it. As a result, the effective exercise dose is lower than planned.
This discrepancy explains why many programs that appear to be correct do not produce the expected results.
Pacing isn't just about counting repetitions
The dosing of therapeutic exercise is a broader concept than simply the number of repetitions. It involves a combination of different variables—volume, frequency, duration, type of exercise, and time under tension—which together determine the stimulus received by the neuromuscular system.
In practice, two patients may perform “the same exercise” and yet receive completely different stimuli depending on how they perform it, at what intensity, or for how long they hold the position.
That is why, when we talk about dosage, we are talking about actual exposure to the movement, not just a prescription.
The most common problem: underdosing
Under-training is probably the most common scenario in musculoskeletal rehabilitation. It occurs when the patient does not reach the minimum volume required to induce adaptation.
This may be due to a variety of factors: fear of movement, pain during exercise, lack of supervision, or simply a lack of engagement. In many cases, these factors were already present in the early stages of the clinical problem.
The consequences are well known: lack of progress, functional stagnation, and, at times, the perception that the treatment is not working. However, the problem lies not so much in the therapeutic approach as in insufficient exposure to the stimulus.
When the dose is too high
Although less common, overtraining is also a reality in clinical practice. It typically occurs when the training regimen exceeds the patient’s capacity or when their response to exercise is not taken into account.
In these cases, increased pain or fatigue can lead to a subsequent decline in adherence or even to discontinuation of treatment. This is particularly relevant in patients with persistent pain, where a negative experience can reinforce avoidance.
How the dose is actually adjusted during a consultation
Proper titration does not involve applying a fixed formula, but rather adjusting the stimulus based on how the patient responds. Pain patterns, functional capacity, the stage of the process, and progress between sessions are variables that must be dynamically incorporated.
This means that dosing is not a one-time decision, but rather an ongoing process of adjustment. However, this process is limited when the available information is incomplete or subjective.
The problem of determining dosage without objective data
In many settings, decisions regarding exercise dosage are based on spot checks and patient feedback. While these tools are necessary, they have clear limitations when it comes to quantifying the actual volume of exercise or the quality of performance.
This introduces significant variability and makes it difficult to determine whether the patient is actually receiving the dose they need or whether the treatment is progressing appropriately.
When the dosage can be measured
Platforms that incorporate motion capture technology can help address this issue. In the case of Rehametrics Physical, the use of sensors makes it possible to objectively record variables such as the number of repetitions, the range of motion achieved, and the consistency of execution.
This not only provides insight into the actual volume of work but also helps identify deviations in execution or changes in performance over time. As a result, resource allocation is no longer based solely on estimates but is instead supported by quantifiable data.
More training without increasing the perceived workload
One of the most significant benefits of interactive environments in tools such as Rehametrics is their ability to increase the amount of practice without the patient perceiving a corresponding increase in workload.
Unlike conventional exercise, where repetition can become monotonous, interactive activities help maintain focus and make it easier to stick with the task. This results in a higher number of repetitions per session and a higher intensity of exercise.
From a clinical standpoint, this is particularly relevant in patients with poor adherence or a tendency to under-exert themselves.
Clinical implications
Properly tailoring therapeutic exercise involves ensuring that the patient receives sufficient stimulation that is appropriate for their ability. To achieve this, it is necessary not only to prescribe the exercise but also to monitor, measure, and adjust it.
Tools that help standardize dosing do not replace clinical judgment, but they do support it by reducing uncertainty and facilitating more precise decisions.
In musculoskeletal rehabilitation, the effectiveness of therapeutic exercise depends largely on the intensity of the exercise. Without sufficient exposure to movement, the adaptations necessary to improve function do not occur.
The challenge is not just choosing the right exercise, but ensuring that the patient performs the amount of work necessary to bring about change.