What actually happens to your nervous system when you get a back massage

A new study suggests that receiving a classical back massage after a mentally demanding task lowers a person’s heart rate but keeps their skin sweat gland activity elevated. The findings indicate that different bodily signals respond to physical touch in distinct ways, meaning they should not be treated as identical signs of relaxation. The research was published in Frontiers in Physiology.

Cognitive load refers to the amount of mental effort required to perform a task, especially when it involves close attention, working memory, and quick decision-making. When mental demands exceed a person’s capacity, they often experience increased effort, mental fatigue, and physical activation. This physical activation is often tracked using heart rate and skin conductance. Heart rate measures how fast the heart pumps blood, which can change based on physical effort, emotional state, or breathing. Skin conductance measures tiny changes in sweat gland activity on the skin, which is directly controlled by the sympathetic nervous system and responds quickly to stress, emotional arousal, or physical touch.

Real-world mental work involves repeated cycles of high demand and rest. Although scientists know a lot about how the body revs up during a difficult task, they know less about the physical recovery process immediately afterward. To help manage stress and promote recovery, people often turn to manual therapies. A classical massage involves a therapist physically rubbing, pressing, and kneading the muscles and tissues of the body to ease tension and promote relaxation.

Past research has looked at how the body responds to both mental strain and physical touch. For instance, a 2019 review indicated that heart and sweat-gland sensors capture distinct bodily facets of mental workload, supporting the idea that they might track different physical processes. Additionally, a 2020 trial demonstrated that brief upper-body massages reliably produce cardiovascular relaxation in a laboratory setting compared to simply resting quietly.

The research, led by Maciej Lachowicz, an assistant professor and Vice-Dean of the Institute of Health Studies at DSW Ideis University in Wrocław, Poland, aimed to explore how heart rate and skin conductance change when someone receives a classical back massage immediately after a demanding mental task. The researchers wanted to see if these two physical signals follow the same path back to a resting state, or if the physical stimulation of a massage causes them to act differently.

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“We wanted to understand recovery after demanding mental activity, which has received less attention than physiological responses during the task itself,” Lachowicz told PsyPost. “We compared massage with quiet rest to examine whether different bodily signals tell the same story.”

The scientists recruited 48 healthy young adults, averaging about 19.5 years of age. The participants were split into two equal groups of 24. One group was assigned to receive a classical back massage, and the other group was assigned to rest passively. Before the experiment began, the researchers screened the participants to ensure they had no health conditions that might affect their nervous system responses.

During the experiment, participants first sat quietly in a chair for a five-minute baseline period to establish their resting physical state. They then completed an eight-minute computer task called the Determination Test. This test required them to press specific buttons as quickly as possible in response to rapidly changing visual and audio signals. The test adapts to the user’s skill level, ensuring a constant state of high mental strain.

After finishing the test, participants rated their perceived mental effort on a standardized questionnaire. They then moved to a massage table and lay face down for a 15-minute recovery phase. The experimental group received a standardized classical back massage using a vitamin massage oil. The massage included specific techniques like sweeping strokes, tissue rolling, and kneading applied to the back by a trained provider. The control group simply lay on the table for 15 minutes without receiving any physical contact.

The researchers continuously measured the participants’ physical responses using sensors. They tracked heart rates using an optical pulse sensor attached to the left earlobe. They also measured skin conductance using sensors placed on the fingers of the non-dominant hand. The 15-minute recovery period was analyzed in three separate five-minute windows to see how the body changed over time.

During the computer task, both groups experienced an increase in heart rate and skin conductance. This confirmed that the computer test successfully induced a state of mental strain and physical activation. There were no statistically significant differences between the two groups in how they performed on the test or how stressed they felt afterward.

During the recovery phase, heart rates decreased for all participants as they lay on the table. The massage group, however, experienced a much greater drop in heart rate than the passive resting group. Across all three five-minute recovery windows, the massage group maintained a lower heart rate. By the final five minutes of recovery, the massage group’s heart rate was roughly 20 beats per minute lower than that of the control group.

“Average heart rate was approximately 15–20 beats per minute lower in the massage group across the three five-minute recovery periods,” Lachowicz explained. However, he cautioned against overinterpreting the immediate cardiovascular drop. “These differences do not establish lasting health benefits or improved mental performance.”

The skin conductance measurements showed a completely different pattern. In the passive resting group, skin conductance steadily dropped back down, eventually falling below the initial baseline levels. In the massage group, skin conductance remained elevated above baseline throughout the entire 15-minute recovery period. During the middle and final five-minute windows, the massage group’s skin conductance was about 3.3 to 3.5 microsiemens higher than that of the resting group.

The authors suggest that these divergent paths, a lower heart rate combined with higher skin conductance, indicate that the two measures capture different aspects of bodily recovery. The persistent sweat gland activity in the massage group does not necessarily mean the participants were feeling stressed. Instead, it suggests that their nervous systems were actively responding to the physical sensation of being touched and rubbed.

Because skin conductance is highly sensitive to sensory input, the friction and pressure of the massage likely kept the sweat glands active even as the heart rate slowed down. The researchers note that these bodily signals should not be treated as interchangeable markers of relaxation, as they react differently to physical contact.

“The main takeaway is that massage is not necessarily associated with an overall state of physiological relaxation,” Lachowicz said. “Different bodily systems can respond differently during massage, so a slower heart rate does not automatically mean that the whole body has shifted into a relaxed state.”

There are a few things to keep in mind when interpreting these findings. The study compared a massage, which involves physical touch and a therapist’s presence, to a control condition where participants simply lay alone. Because of this design, it is hard to tell whether the physical changes were caused specifically by the classical massage techniques or just the general experience of being touched by another person.

“The study sits at the intersection of two methodologically challenging areas: massage research and cognitive science,” Lachowicz noted. “Massage is difficult to standardize scientifically, because pressure, technique, and the experience of receiving touch can vary.”

“Responses to cognitive tasks also depend on each participant’s subjective experience and current state, including attention, fatigue, and mood,” he added. “These sources of variability make it challenging to isolate specific effects and draw conclusions that apply to everyone.”

The skin conductance sensors are also extremely sensitive to minor movements and external physical stimulation. The higher readings during the massage might merely reflect the body’s ongoing reaction to the massage oil and physical friction rather than anything related to recovering from the mental task. Once the massage stopped, the skin conductance might have dropped, but the researchers did not measure the participants after the 15-minute window ended.

The study looked at a small group of healthy young adults during a single laboratory session. The results might differ for older adults, individuals dealing with chronic stress, or people receiving regular massages over several weeks. Future research could use an active control group, such as light stroking or a fake massage, to better isolate the specific effects of classical massage techniques on the body’s recovery process.

Lachowicz also sees a new avenue for this work prior to a stressful task. “An important next step is to explore the ‘other side’ of this relationship: whether massage can help people prepare for a demanding cognitive task and perform it more effectively,” he said. “This shifts the focus from recovery after mental effort to the potential benefits of receiving massage before the task.”

The study, “Classical back massage is associated with lower heart rate and sustained mean skin conductance during recovery after cognitive load: an exploratory controlled pilot study,” was authored by Maciej Lachowicz, Iwona Wilk, Igor Hrehorowicz, Szymon Bałamucki, Michał Lisowski, Dariusz Jamro, Grzegorz Zurek, and Waldemar Andrzejewski.