By Tatiana Martinez, LPC-S
If you’ve ever been in an argument with your partner and felt your heart race, your face go hot, or your mind go completely blank, you’re not imagining it. Conflict in a close relationship isn’t only emotional. It’s physical.
As part of my PhD in Applied Psychophysiology at Saybrook University, I’m designing a dissertation study on exactly this: what happens in the body when couples fight, and whether therapy can help partners stay calmer and recover more quickly.
Your body is part of your relationship
Researchers have known for a while that close relationships affect our physiology. One measure they use is galvanic skin response (GSR), tiny changes in skin conductance that reflect activity in the sympathetic, “fight or flight,” nervous system.
The research on couples is fascinating:
Partners can affect each other’s stress levels. In one study, simply having a romantic partner nearby in daily life was linked with lower physiological arousal, though less so for people with more anxious or avoidant attachment.
Couples’ bodies can “sync up.” Partners’ skin-conductance patterns have been shown to move together, especially during moments of closeness. Synchrony isn’t always a good thing, though. It can also reflect partners setting each other off.
Old patterns show up in the body. How people react physically during an argument has been linked to their early caregiving experiences. The way your body braces in conflict today may have roots in much older relationships.
Psychologists call this co-regulation: partners help regulate each other’s nervous systems. When things are good, your partner can be a source of calm. When things are strained, the same connection can become a source of alarm.
Why fights escalate so fast
In high-conflict relationships, an ordinary disagreement can quickly feel like a threat. Fear, shame, anger or fear of abandonment can push both partners into high arousal. When that happens, it becomes much harder to listen, think clearly or stay curious. Some people go on the attack, others shut down, and many swing between the two.
That’s why “just communicate better” often isn’t enough. It’s hard to use good communication skills when your nervous system is in survival mode.
A parts-based approach to couples therapy
Intimacy from the Inside Out (IFIO) is a couples therapy model based on Internal Family Systems (IFS). Instead of focusing only on communication, it helps each partner notice the protective parts that take over in conflict: the critic, the defender, the one who withdraws. With practice, partners can respond from a calmer, more grounded place, which IFS calls Self.
The goals of IFIO line up closely with what we’d expect to see in the body: less reactivity during hard conversations, and a quicker return to calm afterward.
What my study will explore
Very little research has looked at whether IFIO is linked with measurable changes in the nervous system. My dissertation is designed to help fill that gap. In a small pilot study, couples in IFIO therapy will complete short, structured conversations at the beginning, middle and end of treatment, while GSR measures their physiological arousal. Partners will also describe how intense the conflict felt and how safe they felt with each other.
The question is simple: as couples work with their parts, do their bodies become less reactive in conflict and recover more quickly?
This is early-stage research. As a pilot, its main goal is to see whether these changes can be measured meaningfully. It’s also a chance to bring together two things I care about deeply: the inner world IFS helps us explore, and the physiology that shows how much our relationships live in the body.
What this means for you now
You don’t need a sensor to start noticing your own patterns. The next time a conversation with your partner starts heating up, try this:
Notice your body first. A clenched jaw, a racing heart, heat in your chest: these are signals, not failures.
Name the part. “Part of me is really scared right now,” or “A part of me wants to shut this down.”
Pause before you return. Taking 20 minutes to let your body settle isn’t avoidance. Many couples find conversations go better after a short break.
If this sounds familiar
If you and your partner feel stuck in the same painful cycles, couples therapy can help you understand what’s happening underneath the conflict, in your relationship and in your bodies.
I work with couples in person in Houston’s Montrose neighborhood and by telehealth anywhere in Texas. Request a free 15-minute consultation.
Research referenced: Chatel-Goldman et al. (2014); Han et al. (2021); Herbine-Blank (2015); Raby et al. (2015); Sbarra & Hazan (2008); Timmons et al. (2023).
