Chronic Pain and Physical Activity: Moving Despite the Pain

Title: Chronic Pain and Physical Activity: Moving Despite the Pain

The treatment of long-term musculoskeletal conditions represents one of the most complex challenges in rehabilitation and medical fields. Often, an individual’s instinctive reaction to physical suffering is immobility, based on the belief that absolute rest can promote healing and protect joints. However, modern scientific literature demonstrates exactly the opposite. Understanding the delicate relationship between chronic pain and physical activity is fundamental to breaking the vicious cycle of deconditioning, stiffness, and disability, especially in the over 50 population. Therapeutic exercise is not just a tool to improve physical fitness, but represents a true neuro-modulatory intervention capable of altering the perception of the painful symptom. This article explores the physiological mechanisms, epidemiological data, clinical guidelines, and practical strategies for safely reintroducing movement, always remembering that every therapeutic path must be preventively evaluated and supervised by a doctor or physical therapist.

The link between chronic pain and physical activity: physiology and neuroscience

What is chronic pain?

Pain is defined as chronic when it persists beyond the normal tissue healing times, generally quantified as a period exceeding three to six months. Unlike acute pain, which serves as a vital alarm bell to signal ongoing tissue damage (such as a sprain or a fracture), chronic symptoms lose this primary protective function. In many cases, the original structural damage has completely healed, but the nervous system continues to send alert signals. This condition transforms from a symptom into a true pathology in its own right, negatively affecting quality of life, sleep, mood, and the ability to perform normal daily activities. Managing this condition requires a bio-psycho-social approach, where the mechanical aspect is only one of the components to be evaluated.

The role of the central nervous system and sensitization

To understand the effectiveness of movement, it is necessary to introduce the concept of “central sensitization” (Nijs et al., 2012). In patients suffering from persistent symptoms, the central nervous system (brain and spinal cord) becomes hyperexcitable. Nerve receptors lower their activation threshold, causing normally harmless stimuli, such as a light touch or a simple joint movement, to be interpreted by the brain as serious threats, triggering a disproportionate pain response (allodynia and hyperalgesia). Targeted physical exercise directly intervenes in this mechanism: gradual and controlled movement sends new “safe” signals to the brain, promoting positive neuroplasticity and helping to recalibrate the nervous system, progressively reducing the hyperexcitability of nociceptive neurons.

Why absolute rest is counterproductive

The “Fear-Avoidance” model perfectly describes the behavior of many patients. The fear of experiencing pain or worsening their condition leads to systematic avoidance of motor activity (kinesiophobia). This triggers a cascade of negative events: muscle atrophy, joint stiffness, reduced bone density, and impairment of the cardiovascular system. Physical deconditioning makes the body less tolerant to effort, so even minimal daily activities begin to cause suffering. This creates a downward spiral where the less one moves, the more functional capacity is lost, and the more the perception of the symptom increases. Breaking this cycle through a structured exercise program with a doctor or physical therapist is the first step towards functional recovery.

Benefits of exercise in the over 50 patient

Exercise-Induced Analgesia (EIA)

Motor activity possesses an intrinsic analgesic power, known in the literature as Exercise-Induced Analgesia (EIA). During and after adequate physical exertion, the human body releases a series of endogenous biochemical substances, including endorphins, endocannabinoids, and serotonin. These neurotransmitters act on the descending inhibitory pain pathways, blocking or attenuating nociceptive signals before they reach the cerebral cortex (Lima et al., 2017). In the over 50 population, where the intake of analgesic and anti-inflammatory drugs is often high and burdened by gastrointestinal or cardiovascular side effects, leveraging the body’s “internal pharmacy” through movement represents a conservative strategy of inestimable clinical value.

Improvement of joint mobility and combating sarcopenia

With advancing age, the musculoskeletal system undergoes physiological aging processes. Sarcopenia, the progressive loss of muscle mass and strength, accelerates significantly in cases of prolonged inactivity. Weak muscles are unable to adequately stabilize joints, increasing the load on cartilage and ligamentous structures, exacerbating conditions such as osteoarthritis. Resistance training (strength) stimulates muscle hypertrophy and improves motor unit recruitment. In parallel, movement promotes the nutrition of articular cartilage, which, being devoid of blood vessels, nourishes itself by “imbibition” through the pressure variations of the synovial fluid generated precisely by joint movement.

Psychological and cognitive impact

Persistent suffering is frequently associated with psychological comorbidities such as anxiety, depression, and social isolation. Physical exercise, especially when performed in groups or stimulating environments, has a profound impact on mental health. It promotes a sense of self-efficacy (the belief in one’s ability to manage one’s condition), improves sleep quality (often fragmented in symptomatic patients), and reduces cortisol levels, the stress hormone. Furthermore, the increased cerebral blood flow induced by aerobic activity promotes the maintenance of cognitive functions, an aspect of primary importance in the age group over 50.

INAIL data and socio-economic impact of chronic pain

Musculoskeletal conditions in the workplace

The impact of musculoskeletal conditions is not limited to the personal sphere but represents a heavy burden on the entire socio-economic and healthcare system. Analyzing the data periodically provided by INAIL (National Institute for Insurance against Accidents at Work), it clearly emerges that occupational osteoarticular and musculotendinous diseases constitute the vast majority of claims for occupational diseases in Italy. Sectors such as construction, logistics, healthcare, and office work (due to prolonged sedentary behavior) are particularly affected. Workers over 50, due to the cumulative biomechanical overload over the years, are the category most exposed to developing chronic low back pain, rotator cuff tendinopathies, and cervicobrachialgia.

The importance of secondary and tertiary prevention

INAIL reports highlight how absenteeism from work caused by musculoskeletal disorders entails enormous direct costs (medical expenses, indemnities) and indirect costs (loss of productivity). In this context, the rehabilitative approach based on active movement is configured as the most effective form of secondary prevention (to avoid relapses) and tertiary prevention (to manage chronic disability). Occupational medicine policies are increasingly integrating ergonomics and postural gymnastics programs in the workplace. However, it is essential that the worker, especially if of mature age, adopts an active lifestyle even outside working hours, relying on a doctor or physical therapist to structure a recovery plan that takes into account the specific job duties performed.

Guidelines for managing chronic pain and physical activity

Initial assessment and risk stratification

Before embarking on any exercise program, it is imperative to undergo an accurate clinical evaluation. The doctor or physical therapist will be responsible for excluding so-called “Red Flags,” which are signs and symptoms that could indicate serious underlying pathologies (infections, fractures, oncological or rheumatological conditions in the acute phase). Once the benign and mechanical nature of the disorder is confirmed, the professional will proceed with cardiovascular and musculoskeletal risk stratification, evaluating effort tolerance, range of motion (ROM), and muscle strength. Only after this careful analysis will it be possible to draw up a personalized program.

Recommended exercise types

• Aerobic Exercise: Low-impact activities such as brisk walking, swimming, cycling, or stationary biking. The goal is to improve cardiovascular capacity, promote weight loss (reducing the load on weight-bearing joints), and stimulate the release of endorphins. 150 to 300 minutes per week at moderate intensity are recommended.
• Strength Exercise (Resistance Training): The use of free weights, isotonic machines, or resistance bands is fundamental to combating sarcopenia. Strengthening periarticular musculature ensures greater stability and protection for degenerated joints. 2-3 sessions per week, working on major muscle groups, are advised.
• Flexibility and Mobility Exercises: Practices such as stretching, therapeutic yoga, or clinical Pilates help maintain joint range of motion, reduce myofascial tension, and improve body awareness (proprioception).

The concept of “Pacing” (Rhythm Management)

One of the most common mistakes in patients with fluctuating symptoms is the “Boom-Bust” cycle. On days when one feels good, there’s a tendency to overdo it (Boom), inevitably leading to a severe flare-up of symptoms in the following days, which forces involuntary rest (Bust). The clinical strategy par excellence in these cases is the Pacing (Geneen et al., 2017). Pacing consists of breaking down physical activities into tolerable time intervals, stopping before the symptom becomes unbearable, and increasing the workload in an extremely gradual and programmed manner, regardless of how one feels at that precise moment. This rational approach prevents inflammatory peaks and builds tolerance in the long term.

Specific pathologies and motor approach

Osteoarthritis (Knee, Hip, Spine)

Osteoarthritis is the most common degenerative joint disease among those over 50. It is characterized by cartilage thinning and subchondral bone alterations. Contrary to old beliefs, walking or exercising does not further “wear out” the joint. On the contrary, OARSI (Osteoarthritis Research Society International) guidelines place therapeutic exercise as a first-line conservative treatment. For knee and hip osteoarthritis, strengthening the quadriceps, glutes, and hamstring muscles is vital for absorbing mechanical shocks during walking. Water activities (hydrokinesiotherapy) are particularly indicated in the initial phases, as buoyancy reduces gravitational load, allowing for wide and painless movements.

Fibromyalgia

Fibromyalgia is a complex syndrome characterized by widespread musculoskeletal pain, chronic fatigue, sleep disturbances, and cognitive fog. In this condition, the central nervous system is in a state of profound hypersensitivity. The motor approach must be extremely cautious. Aerobic exercise of mild to moderate intensity (such as Tai Chi, Qi Gong, or gentle walking) has shown strong scientific evidence in improving the quality of life of these patients (Macfarlane et al., 2017). It is crucial to avoid muscle exhaustion and rigorously apply the Pacing technique, as fibromyalgia patients are particularly susceptible to DOMS (Delayed Onset Muscle Soreness), which can easily be confused with a worsening of the disease.

Non-specific chronic low back pain

Persistent back pain, in the absence of specific pathologies such as extruded disc herniations with neurological deficits or severe stenoses, is defined as non-specific. It is the leading cause of disability globally. Scientific literature (Searle et al., 2015) shows that there is no single “magic” exercise for low back pain. Whether it’s Pilates, motor control (Core Stability), McKenzie exercises, or simple walking, what matters is adherence to the program and movement itself. The goal is to desensitize the lumbar structures, overcome the fear of flexing or extending the spine, and strengthen the trunk musculature (abdominals, paravertebrals, multifidus) so that it can adequately support the spine during daily and work activities.

How to start an exercise program safely

The role of the doctor or physical therapist

Do-it-yourself, especially in the presence of complex and prolonged clinical conditions, is strongly discouraged. Relying on a doctor or physical therapist ensures that the training program is tailored to the patient’s actual capabilities. The healthcare professional does not merely provide an exercise sheet but educates the patient on correct biomechanical execution, monitors progress, modifies workloads based on the body’s responses, and provides the necessary psychological support to overcome moments of frustration that inevitably arise during a long-term rehabilitation process.

Symptom monitoring and the acceptable pain rule

One of the biggest fears for those approaching movement is: “If I feel discomfort while exercising, am I making my situation worse?” The answer, in most chronic cases, is no. It is normal and expected to experience a certain degree of discomfort when deconditioned muscles and joints are reactivated. To manage this phase, the “Pain Traffic Light” system, based on a numerical scale from 0 (no symptoms) to 10 (unbearable symptoms), is often used in physiotherapy.

It is fundamental to distinguish between normal post-workout muscle soreness (which appears after 24-48 hours and resolves spontaneously) and a true joint flare-up. If the discomfort experienced during exercise falls within the green or yellow zone and returns to baseline levels within 24 hours of the session’s end, the workload is to be considered adequate and safe.

Frequently Asked Questions (FAQ)

Frequently Asked Questions

What is chronic pain?

Chronic pain is defined as pain that persists beyond the normal tissue healing time, generally exceeding three to six months. Unlike acute pain, which signals ongoing tissue damage, chronic pain often loses this primary protective function and can become a pathology in its own right.

Why is immobility often not recommended for chronic pain?

While an instinctive reaction to pain might be immobility, modern scientific literature demonstrates that prolonged rest can worsen chronic pain. Immobility contributes to a vicious cycle of deconditioning, stiffness, and disability, which can exacerbate the condition.

How does physical activity influence chronic pain perception?

Physical activity acts as a neuro-modulatory intervention, capable of altering the perception of painful symptoms. Therapeutic exercise helps to break the chronic pain cycle by influencing the nervous system’s processing of pain signals, rather than just improving physical fitness.

What is the role of professional guidance when reintroducing movement for chronic pain?

Any therapeutic path involving physical activity for chronic pain must be preventively evaluated and supervised by a doctor or physical therapist. This ensures that movement is reintroduced safely and effectively, tailored to the individual’s specific condition and physiological mechanisms.

Sources and Scientific References

1. Geneen LJ, Moore RA, Clarke C, Martin D, Colvin LA, Smith BH. Physical activity and exercise for chronic pain in adults: an overview of Cochrane Reviews. Cochrane Database Syst Rev

Sources and Scientific References

1. Fernández-Rodríguez R et al. (2022). Best Exercise Options for Reducing Pain and Disability in Adults With Chronic Low Back Pain: Pilates, Strength, Core-Based, and Mind-Body. A Network Meta-analysis. J Orthop Sports Phys Ther. 52:505-521. DOI | PubMed
2. Peng MS et al. (2022). Efficacy of Therapeutic Aquatic Exercise vs Physical Therapy Modalities for Patients With Chronic Low Back Pain: A Randomized Clinical Trial. JAMA Netw Open. 5:e2142069. DOI | PubMed
3. Geneen LJ et al. (2017). Physical activity and exercise for chronic pain in adults: an overview of Cochrane Reviews. Cochrane Database Syst Rev. 1:CD011279. DOI | PubMed
4. Gallardo Vidal MI et al. (2022). [Physiotherapy and health education protocol in chronic musculoskeletal shoulder pain. Experience in Primary Care]. Aten Primaria. 54:102284. DOI | PubMed
5. Alagingi NK (2022). Chronic neck pain and postural rehabilitation: A literature review. J Bodyw Mov Ther. 32:201-206. DOI | PubMed