By Tuulia Luomala and Carol M. Davis

Manual therapists who use light touch believe that they are effective because they induce or respond to subtle soft tissues changes under their hands and the patient reports or displays a positive response. However, most therapists are at a loss to explain the science behind this therapeutic intervention – they are unable to explain exactly what is going on under their hands and the perceived soft tissue changes. 

This article aims to shed some light on the topic of light touch and how we currently think it might be working in our patients. Potential mechanisms of action include intention, and energetic, neurologic, and biomechanical models.

For a fuller understanding, a glossary has been provided for the underlined terms in this article. Also plan on attending the September 26^th Community Gathering where the topic will be discussed in more detail.

Practitioner-patient interactions

There are many different levels and complexities of the practitioner-patient interaction. Some of these include:

• Anticipation or anxiety as the owner and patient waits for the practitioner to arrive or greet them
• Unconscious responses and nonverbal communication as the humans meet and greet each other 
• Interspecies interactions between the animal and surrounding human handlers or practitioners
• Purposeful approach and interaction with the animal patient
• Therapeutic intent of the practitioner
• Physical contact with the patient
• General behavioral responses
• Local tissue responses

Social interactions and responses to verbal and non-verbal cues and actual physical contact form the initial foundation for any form of manual therapy. Light touch is considered the most subtle form of physical contact between practitioner and patient.

A gentle approach to healing

Light touch therapy is a gentle, non-invasive form of manual therapy that involves subtle and soft contact with the skin or tissues. Unlike more forceful manual techniques, light touch therapy prioritizes minimal pressure and delicate movements to facilitate healing and relaxation. This approach is rooted in the belief that the body’s natural healing mechanisms can be stimulated through gentle touch with a focus on specific tissues or regions of the body.

The scientific basis for light touch therapy is still emerging, with several theories proposed to explain its effectiveness:

• Neuromodulation: Light touch is believed to influence the nervous system by modulating nerve signals, potentially calming overactive nerve pathways and promoting relaxation.
• Psychosomatic integration: The gentle nature of light touch may facilitate a deeper mind-body connection, enhancing the body’s natural healing processes through psychological and emotional pathways.
• Fluid dynamics: Techniques such as craniosacral therapy propose that light touch influences the movement of bodily fluids aiding in the maintenance of homeostasis.

Despite these promising theories, more research is needed to fully understand the mechanisms and validate the effectiveness of light touch therapy.

Vibration and energy

Atoms form the building blocks of everything around us. Therefore, vibration is a fundamental element when examining bodily functions like breathing, blood flow, the nervous system, hormone regulation, and even our thoughts. 

All cells and organisms vibrate in a wave-like manner. The individual frequency of vibration distinguishes cells from one another.

Living organisms emit and are infused with energy. 

There are many different forms of energy. In the context of manual therapy, the most relevant forms are electrical energy, electromagnetic energy, and subtle energy. Horses, for example, can sense our thoughts through subtle energy. They are highly sensitive beings, constantly interpreting their environment via subtle energy.

Energy can travel through biofields, local fields, and energy pathways. Biofields distribute energy and information within the body across various levels. While lines can help our human brains understand things, ultimately, everything spirals and forms different pathways from the surface to deeper parts of the body and vice versa. In our microcosms, everything can be zoomed out to the macrocosms and even beyond.

Negative thoughts and their opposite – positive thinking – create different vibrations, which can be sensed by others, including animals. The brain and the heart generate electromagnetic fields measurable using electroencephalogram (EEG) and electrocardiogram (EKG). Heart coherence is a state where the heart vibrates at a special frequency (0.1 Hz), which can be achieved through meditation, slow breathing, focused attention, and mindfulness (McCraty R., 2009).

The resonance of our energy fields becomes evident when we meet someone. What are your thoughts? How do you feel? What kind of interaction are you creating? How can you know something that the other person has not told you? By intuition. Intuition is a powerful tool for understanding the present moment and trusting our ability to interpret the messages flowing in the quantum field (Raami A., 2019).

Receptors and C-tactile fibers

In short, light touch is powerful because it activates Merkel cells and C-tactile fibers, which are related to nurturing care, compassion, and empathy. Unmyelinated C-fibers respond to gentle stroking and are low-threshold mechanoreceptors. In the spinal cord, C-tactile fibers form glomerular synaptic arrangements and provide input to interneurons within the nociceptive circuitry (Larsson M. & Nagi S., 2022). Gentle stroking at a velocity of 1-10 cm/sec seems optimal for reducing heart rate and promoting pro-social processes (Schirmer A. et al, 2023).

Mechanotransduction

Piezoelectric receptors in cell membranes respond to mechanical stimuli, a process known as mechanotransduction. When we touch the body, the cell nucleus receives that information via mechanotransduction. Resonance plays a key role in explaining this phenomenon (Ingber D., 2003 & 2006).

Mammals have two piezo genes: Piezo1 and Piezo2. Piezo1 is highly present in the skin, while Piezo2 is found in dorsal root ganglion cells. Both genes are related to mechanical nociception (Faucherre A. et al, 2013). Piezoelectric pressure affects flow via Schwann cells and mechanoreceptors, which is another aspect of mechanotransduction (Woo S. et al., 2014 & 2015).

A conversation between bodies

Light touch invites the body to react – it is a conversation between two bodies, both listening and changing simultaneously.

The body naturally seeks balance and harmony – homeostasis. Light touch gently guides the body toward homeostasis. Integrins, fibroblasts, telocytes, and the entire immune system receive information via touch. Interstitium is a highway of information and mechanotransduction. (Theise N. et al, 2023)

External and internal forces, such as gravity, proprioception, and interoception, are always part of physical development. The embryo evolves from the body’s blueprint, and after conception, DNA, self-evolving, self-development, and creation continue.

The embryo develops within different layers, and fascia creates unity between every organ, bone, and myofascial structure. In this way, fascia can be seen as a container for mechanotransduction and energy flow in the body, both structurally and functionally. The term biotensegrity sums up the tension and compression elements, which are the dynamic energies of life and cell function.

Mammals are always seeking safety. In light touch therapy, the goal is to help the patient feel safe, enabling the body to heal itself. We are always seeking a safe place; it’s in our nature. When you feel safe, you can heal, digest, and rest. If you feel unsafe, your body may trigger a fight-or-flight response. According to the polyvagal theory, the ventral complex of the vagus nerve governs social engagement and nurturing, while the dorsal complex is responsible for primal functions like breathing, feeding, mating, and survival (Porges S., 2023). 

Gentleness, kindness, empathy, and love without judgment can promote healing. By directing intention in this mindful way, we can help the body better self-regulate. 

Non-linear thinking, the irrational response of soft tissue (Leonid Blyum, 2020)

Blyum presents a compelling working hypothesis to demonstrate the effectiveness of light touch. He says that we need to move beyond linear thinking and embrace non-linear thinking. In manual therapy, his stress/strain response curve can serve as a basis for this thinking.

In the stress/strain response curve, Phase 1 corresponds to light touch, where electrical, hydraulic, and heat conduction are present. In Phase 1, collagen fibers remain crimped, while in Phase 2, fibers straighten. Phase 3 includes microinjuries in collagen fibers, and Phase 4 involves total rupture. 

Using non-linear thinking, Phase 1 does not trigger the dual negative feedback mechanism and represents a “wild non-linear” state where response ratios are irregular, unpredictable, and incalculable. Dual negative feedback mechanisms, which balance stiffness and compliance within the extracellular matrix, are present in Phases 2 and 3. These phases are “mildly non-linear”, as the stress-strain and tension-length relationships exhibit much less irregularity and unpredictability. In Phase 4, predictability increases again, returning to a wild non-linear state.

Light touch operates in Phases 1 and 2, where mechanotransduction occurs. In Phase 2, self-healing is precise and has a minimal error rate. Phases 1 and 2 are precision-based rather than force-magnitude-based. In Phase 2, tissue undergoes uniform deformation characterized by a uniform strain energy density, creating a uniform strain field.

Strain energy appears when light touch is applied, and the therapist experiences a sensation of “melting” or releasing. This process causes fibroblast networks to reorganize, activating dormant fibroblasts and forming new tension lines in the cytoskeletal network. This stimulates the connection between the fibroblast-extracellular matrix network and activates collagen synthesis.

Light touch and movement can improve tissue compliance and hydration by altering glycosaminoglycan type II ground substance in the extracellular matrix.

Blyum’s non-linear approach emphasizes that force density, not force magnitude, is the main factor when tissue remodels. In this context, quality is more important than quantity.

Imbalances and discontinuities in soft tissues can be addressed using light touch within a biotensegral model. Strain energy will respond and self-organize with the aid of light touch.

Practical application of the science of subtle energy

For light touch to be effective, the therapist must adopt a specific mindset, different than other types of bodywork. It is recommended to center yourself when entering a new place – feel the weight of the air and your thoughts, let them be and flow through you. Breathe slowly and connect with your breath. Unite your mind and body and be open to the person or animal you are encountering. This creates heart resonance, allowing you to sense your environment empathetically and lovingly.

Indications for using light touch as a treatment tool

There are many indications for using light touch:

• To promote feelings of safety
• To promote healing after injury or dysfunction
• To balance bodily functions
• To improve body awareness and interoception
• To create homeostasis
• To relax the myofascial and nervous systems
• To balance and enhance vagal tone

Precautions 

Precautions are necessary if the patient has dysautonomia, postural orthostatic tachycardia syndrome (POTS), chronic fatigue syndrome or myalgic encephalomyelitis, because light touch can aggravate symptoms and cause an irrational response of the body. In these cases, it is important to assess the state of the autonomic nervous system at the beginning of the treatment sessions. Also, with oncological cases, it is important to treat far away from the actual tumor because tumor cells spread and increase in size in stiff fascia. Mobile fascia promotes an immune system response. Exercise and hydration of the fascia promotes healing. (Nelson C. & Bissell M., 2006)

In closing…

Light touch therapy offers a gentle, nurturing alternative to more intensive manual therapies. By focusing on minimal pressure and subtle movements, it aims to tap into the body’s natural healing capabilities. Whether used for pain relief, stress reduction, or as a supportive care measure, light touch therapy holds a valuable place in the spectrum of therapeutic interventions. As with any therapy, it is important to consider the individual needs and conditions of the patient, and to measure outcomes carefully to ensure the best possible results.

Although there exist several promising theories regarding the mechanisms at work, more research is needed to fully understand these mechanisms and validate the effectiveness of light touch therapy.