Historical Biodynamic Theory Biodynamic · Historical Physiological Theory · Limited/Contested Evidence

The Vasomotoric Cycle

Does every nervous system return to baseline in the same way?

At a glance

A Biodynamic theoretical model describing cycles of expansion and contraction in the body’s energy or arousal — movement toward charge, and movement toward discharge and rest. In ordinary language: activation, bodily mobilisation, a peak or charge, and then settling or completion.

What Boyesen meant, and what physiology actually establishes

Within Biodynamic theory, healthy functioning involves moving fluidly through this cycle — building charge and then discharging it — rather than getting chronically stuck at one end. The Biodynamic tradition teaches “vaso-motoric and psycho-dynamic cycles” as part of its core theory, rooted in Reichian energetic language about charge and discharge in the autonomic nervous system.

Contemporary physiology does establish that the autonomic nervous system moves through states of activation and recovery, and that stress responses generally include some form of return toward baseline. What it does not establish is the specific Biodynamic claim that this movement follows one particular cyclical pattern that indicates psychological health when complete and pathology when interrupted. That more specific claim remains a useful clinical metaphor within this tradition, not an established physiological mechanism.

You might recognise this

“My body doesn’t really ‘settle’ after activation the way it’s supposed to — it just changes state.” “I can feel emotionally resolved and still be in pain or spasming afterward.” “My heart rate does its own thing regardless of how I feel psychologically.” “I don’t get a clear sense of a cycle completing. I just notice I feel a bit different than before.”

The disability question

A model built around cycles of visible expansion and discharge can quietly assume a body with the physical capacity for both — which doesn’t describe every body. A person managing chronic fatigue, a limited energy budget, or a neurological condition affecting arousal may not experience anything resembling this cycle, and that absence isn’t a sign of being stuck or unhealthy. It may simply be a different, equally valid pattern.

Disability complicates the “completed cycle” ideal directly: a person may continue to have pain, spasm, tachycardia, fatigue, autonomic symptoms or motor differences after feeling psychologically resolved. That does not prove they are emotionally incomplete.

A lived scene · fictional teaching example

A client with dysautonomia describes feeling genuinely lighter and clearer after talking through something painful, but her heart rate stays elevated for the rest of the session, as it often does regardless of her emotional state. A therapist looking for the classical vasomotoric “settling” might wonder aloud whether something is still unresolved. Instead, checking in, the therapist asks how she’s actually feeling. “Lighter. My heart’s just doing its own thing, that’s normal for me.” The session is treated as complete on her report, not on a reading of her pulse.

A process: Notice → Name → Check → Don’t require the pattern

Notice: what is actually observable in the body, described plainly, without assuming a cycle shape onto it.
Name: what the person themselves calls what just happened, in their own words.
Check: does their account match, complicate or contradict the classical cycle? All three are fine.
Don’t require the pattern: completion is defined by the person’s own experience, not by a visible physiological signature.

Where this concept can help

As a loose descriptive vocabulary for talking about activation and settling in a session, and as a prompt to notice bodily state changes over time without forcing them into a single expected shape.

Where interpretation should stop

When ongoing physical symptoms after a session are treated as evidence of incomplete psychological work; when a body’s failure to visibly “discharge” is read as pathology; when a chronic condition affecting arousal or heart rate is mistaken for an unfinished emotional cycle.

Evidence and status

This is a historical theoretical model rooted in Reichian energetic language, not an established physiological mechanism with strong contemporary empirical support. It’s presented here as a piece of this tradition’s internal framework, useful for understanding its clinical logic, rather than as settled science.

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Evidence & sources

Sources checked in October 2026, using targeted searches rather than a systematic review. “We have not located” means our searches did not find it.