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Salud mental

versión impresa ISSN 0185-3325

Salud Ment vol.42 no.3 México may./jun. 2019

http://dx.doi.org/10.17711/sm.0185-3325.2019.015 

Original articles

Psychophysiological stress response of newly-diagnosed breast cancer patients with and without risk of metabolic syndrome

Respuesta psicofisiológica al estrés de pacientes con cáncer de mama de diagnóstico reciente, con y sin riesgo de síndrome metabólico

Veronica Neri-Flores 1  

Juan Alejandro Torres-Domínguez 2  

Alejandro Mohar-Betancourt 3  

María Dolores Rodríguez-Ortiz 4  

Andrea Castro-Sánchez 5  

Carmen Lizette Gálvez-Hernández 5   * 

1Posgrado de Psicología, Facultad de Psicología, Universidad Nacional Autónoma de México, Ciudad de México, México.

2Unidad de Epidemiología, Instituto Nacional de Cancerología, Ciudad de México, México.

3Programa Nacional de Cáncer, Instituto Nacional de Cancerología, Ciudad de México, México.

4Laboratorio de Psicofisiología Aplicada, Facultad de Psicología, Universidad Nacional Autónoma de México, Ciudad de México, México.

5Cátedras-CONACyT-INCan, Instituto Nacional de Cancerología, Ciudad de México, México.

Abstract

Introduction

Little is known about how metabolic comorbidity affects stress response during breast cancer (BRCa) after a recent diagnosis.

Objective

To evaluate the physiological and psychological differences between the BRCa-RSxM groups and those with BRCa alone, and the influence of psychological variables and comorbidity in terms of stress response.

Method

Comparative non-experimental causal-descriptive study. Fifty patients recently diagnosed with BRCa (25 with BRCa and 25 with BRCa-RSxM) in a convenience sample participated. Frontal muscle activity and skin conductance were recorded in response to stressful conditions. Quality of life, perceived stress, and coping strategies scales were used.

Results

The presence of comorbidity (p = .001; p = .02), perceived stress (p = .004; p = .03), and social quality of life (p = .01; p = .01) influenced muscle activation and conductance during the emotional stressor (ES). Putting the stressful situation into perspective as a cognitive coping strategy was related to a decrease in activation (p = .04). An increase in physiological activation during the cognitive stressor (CS) was influenced by comorbidity (p = .05) and quality of social life (p = .01; p = .01). In turn, a decrease was influenced by the increase in age (p = .02).

Discussion

Physiological vulnerability, coping strategies (behavioral and cognitive), and prior learning influenced the resulting reaction during the stressful situation.

Conclusion

A metabolic disease, as a prelude to an oncological, may cause physiological vulnerability to respond adequately to stressful conditions.

Keywords: Breast cancer; comorbidity; stress; psychophysiology; clinical psychology

Resumen

Introducción

Es poco lo que se sabe acerca de cómo afecta a una comorbilidad metabólica a la respuesta al estrés durante el cáncer de mama (CaMa) tras un diagnóstico reciente

Objetivo

Evaluar las diferencias fisiológicas y psicológicas entre los grupos de CaMa-RSxM y sólo con CaMa, y la influencia de las variables psicológicas y la comorbilidad en cuanto a la respuesta al estrés.

Método

Estudio no experimental descriptivo-causal comparativo. Participaron 50 pacientes con diagnóstico reciente de CaMa (25 en CaMa y 25 en CaMa-RSxM) en un muestreo por conveniencia. Se registraron la actividad muscular frontal y la conductancia de la piel frente a condiciones estresantes. Se aplicaron escalas de calidad de vida, estrés percibido y estrategias de afrontamiento.

Resultados

La presencia de la comorbilidad (p = .001; p = .02), estrés percibido (p = .004; p = .03) y la calidad de vida social (p = .01; p = .01) influyeron en la activación muscular y la conductancia durante el estresor emocional (EE). Poner en perspectiva la situación estresante como estrategia cognitiva de afrontamiento se relacionó con una disminución de la activación (p = .04). El aumento de activación fisiológica durante el estresor cognitivo (EC) estuvo influido por la comorbilidad (p = .05) y la calidad de vida social (p = .01; p = .01); a su vez, la disminución lo estuvo por el aumento en los años de edad (p = .02).

Discusión

La vulnerabilidad fisiológica, las estrategias de afrontamiento (conductuales y cognitivas) y el aprendizaje previo influyeron en la reacción resultante surgida durante la situación estresante.

Conclusión

Una enfermedad metabólica, como antesala de una oncológica, puede ocasionar vulnerabilidad fisiológica para responder adecuadamente a condiciones estresantes.

Palabras clave: Cáncer de mama; comorbilidad; estrés; psicofisiología; psicología clínica

Introduction

Patients with breast cancer (BRCa), the leading cause of death from cancer in women in Mexico (Knaul, López-Carrillo, Lazcano-Ponce, Gómez-Dantés, Romieu, & Torres, 2009; GLOBOCAN, 2012), may concomitantly face the risk of a metabolic syndrome (RSxM), which includes the presence of certain highly prevalent diseases, such as obesity, arterial hypertension, and/or type II diabetes mellitus (Mohar, Reynoso, Villareal-Garza, Bargalló-Rocha, Arce-Salinas, & Lara-Medina, 2015). This comorbidity not only increases harm but also physical and psychological demands, which, if not properly treated, worsen the evolution of both illnesses (Lifshitz, 2016; National Institute on Drug Abuse [NIDA], 2017). It has been found that physical and psychological demands cause women with oncological or metabolic diseases to perceive themselves as being stressed during the development of the disease (Lebel, Rosberger, Edgar, & Devins, 2007). In these patients, stress has been evaluated through the recording of peripheral physiological responses and the use of psychometric instruments (subjective recording).

Physiological evaluations show that, when patients with BRCa face stressful situations, they respond with high cardiovascular, muscular, and electrodermal activity, in comparison with their baseline (Karvinen, Murray, Arastu, & Allison, 2013; Bower, Ganz, & Aziz, 2005; Pitman, Lanes, Williston, Guillaume, Metzger, Gehr et al., 2001; Watson, Pettingale, & Greer, 1984). Conversely, patients with RSxM (without diabetes) present, from heir baseline, a high cardiovascular, muscular, respiratory, and peripheral temperature, which increases in response to the stressful stimulus (Garafova, Penesova, Cizmarova, Marko, Vlcek, & Jesova, 2014; Kaushik, Mahajan, Rajesh, & Kaushik, 2004; Pasquali, Anconetani, Chattat, Biscotti, Spinucci, Casimirri et al., 1996; Fredikson, Dimberg, Frisk-Holmberg, & Ström, 1982). In the subjective evaluation, patients with BRCa reported moderate stress levels (Becerril, Camacho, & Canabal, 2013), whereas women in the RSxM group reported the highest stress levels, compared with men (Pasquali et al., 1996; Ramírez, 2005; Delgado, 2010).

The relevance of these findings is based on two facts. The first is that the greater the stress, the lower the quality of life perceived by patients with BRCa (Hernández, 2012) during active treatment, coupled with the negative effect of the secondary physical reactions of cancer treatments (such as pain, fatigue, and constipation). The second is that chronic stress causes anxiety, depression, and fatigue (Hernández, 2012; Schunk, Reitmeir, Schipf, Völzke, Meisinger, Ladwig et al., 2015; Kirk, Price, Penney, Rehman, Lyons, Piccinini-Vallis et al., 2014).

If we consider that the literature has found, separately, that both groups of patients experience physical and psychological reactions to stressful situations that may put their adaptation to the disease and their everyday lives at risk, and that patients with comorbidity may differ in this regard from those with only one condition, it is therefore necessary to determine:

  1. Whether patients with comorbidity are different from those who do not have it in terms of their stress response (physiological and psychological), to identify whether comorbidity alters the stress response as hypothesized, and also, whether this group requires specific interventions for this reason.

  2. What the physiological and psychological stress responses are like simultaneously in order to confirm the conceptual components of the stress response, as well as to determine whether it is only perceived or whether there is a physiological reaction, which will determine the clinical training that will be designed.

  3. Whether the groups have already altered stress responses before receiving oncological interventions. In this case, this would justify the need for psychological therapy from the time of the recent diagnosis in order to reduce the effect of the first interventions in these terms.

Accordingly, the objectives of this study are to evaluate the physiological and psychological differences between the BRCa-RSxM groups and those with BRCa alone, and the influence of psychological variables and comorbidity in terms of the stress response.

We hypothesize that patients with BRCa-RSxM will have significantly higher levels of physiological and psychological stress.

Method

Design

Comparative non-experimental causal-descriptive study.

Participants

We recruited recently-diagnosed BRCa patients ages 18 to 70. They were classified into two groups: those with BRCa alone and those with BRCa-RSxM. The inclusion, exclusion, and elimination criteria are detailed in Table 1.

Table 1.  Criteria for inclusion in/exclusion from sample  

Group Inclusion criteria Exclusion criteria Elimination criteria
BRCa Not suffering from any chronic metabolic disease    
Aged 18-70 (obesity, hypertension or type II diabetes mellitus) Having a psychiatric disorder  
Minimum schooling com-   or neurological disease (e.g. Incomplete evaluation
pleted elementary education   psychosis, dementia)
  Having any of the following diseases:    
  - Obesity: Body mass index (BMI) equal to or Not having the measure  
BRCa-RSxM** greater than 30 kg/m2 RSxM in the electronic file. Dropped out of the study
Newly diagnosed with - Arterial Hypertension (systolic greater than o  
BRCa (no longer than 6 equal to 130 mmHg and diastolic greater than  
weeks) or equal to 85mmHg) ** Having more than 3 meta
  - Diabetes mellitus type II bolic diseases

Notes: Kg/m2 = kilograms per square meter; mmHg = millimeters of mercury

The study population was recruited through convenience sampling in the Department of Breast Tumors of the Instituto Nacional de Cancerología (INCan) of Mexico City, from August 2016 to June 2017.

Instruments

The following selected psychometric instruments have been validated in the Mexican population:

For both instruments, the minimum score is 0 and the maximum score 100. A high score on the functionality and quality of life scales represents high levels of quality of life, whereas a high score on the symptoms scale means a high level of symptoms or problems (Fayers, Aaronson, Bjordal, Groenvold, Curran, Bottomley et al., 2001).

The physiological variables registered (with computerized equipment from J and J Engineering I-330 - C2 +) were as follows:

  • Muscle activity of front muscles (Cram, Kasman, & Holtz, 2011) recorded by means of surface electromyography (EMGs). It is conceived as the sum of potentials of an indeterminate set of motor units, located in the front muscle, expressed in micro volts (mvolts). Higher levels of mvolts are interpreted as higher levels of activation.

  • Conductance of the skin in the hand (Dawson, Schell, & Filion, 2007) registered through the electrodermography technique (EDG) as a change produced in the conductance caused by an externally applied current. It is expressed in microSiemens (mS). The higher the mS levels, the higher the activation levels.

Procedure

The study was approved by the Ethics and Research Committees of INCan (016/033/IBI, CEI/1045/16). First of all, psychologists trained in psychophysiological evaluation used clinical information in electronic files to find patients who met the inclusion criteria. The day they went to the Institute to receive their BRCa diagnosis for the first time, while they were in the waiting room, they were invited to participate and had the study explained to them. If they accepted, they signed the informed consent form.

The evaluation was carried out in a single session. First of all, the psychological part was performed, which included a clinical interview, prepared ex profeso, which collected sociodemographic data, clinical data (oncological and metabolic), and information on the respondents’ lifestyle (sleep habits, physical activity, and diet), as well as the application of psychometric instruments.

Afterwards the physiological evaluation was carried out. This consisted of placing EMG electrodes on the area of the forehead, and EDG electrodes on the distal phalanx of the ring finger of the left hand (Khazan, 2013; Arena & Schwartz, 2003). During the entire evaluation time, patients remained connected to the sensors and sat in front of a computer, where they were given instructions for each of the following conditions (which lasted two minutes and were continuous): 1. adaptation period (familiarize the patient with the evaluation); 2. baseline 1 (neutral conversation); 3. cognitive stress (counting down in sevens from 1000); 4. recovery 1 (they remained seated); 5. emotional stress (verbal recollection of a stressful event); 6. recovery 2; 7. baseline 2 (they sat silently), 8. relaxation (in the way they usually do), and 9. recovery 3. After the registration had been completed, the patient’s perception of these conditions was explored.

Statistical analysis

The physiological data statistically analyzed were obtained from the raw signal recorded and analyzed by the equipment used. It uses a 100 to 400 Hz filter to eliminate artifacts, and a digital filter that allowed the transmission of 60 Hz to the computer in the form of a raw wave. The program rectified and integrated the signal to provide an area under the curve and was also transformed using a Fast Fourier transform (Engineering, J & J, 2004).

First of all, this was used to undertake a descriptive analysis (with central tendency and dispersion measures for continuous variables, and frequencies and percentages for categorical variables). Secondly, normality (Shapiro-Wilk) and homoscedasticity (Snedecor’s F) tests were carried out. Thirdly, in order to respond to objective 1, a bivariate analysis was performed where the BRCa and BRCa-RSxM groups were compared, using the statistical test by type of variable: Student’s t or Mann Whitney U (numerical variables) and Chi-square or Fisher’s exact (categorical variables). Fourth, for objective 2, the average of each physiological variable was calculated for each evaluation phase. Multiple linear regression models and nonlinear models (quantile) were proposed, according to the behavior of the variable, to establish the relationship between physiological variables (dependent variable) and the other variables (called predictors: presence of RSxM, overall quality of life, perceived stress, quality of social life, perspective, positive approach, emotional focus, and insomnia) during stress tasks. In other words, in order to evaluate muscle activity and conductance in stressor conditions, quantile regressions were presented, expressing the quantiles of conditional distribution as linear functions of independent variables. Their robustness was an advantage compared to the extreme values obtained in the determinations (Vicéns & Sánchez, 2012). Four models were presented: 1. muscle activity with emotional stressor (linear regression); 2. Muscle activity with cognitive stressor (nonparametric regression); 3. Skin conductance with emotional stressor (non-parametric regression) and, 4. Skin conductance with cognitive stressor (nonparametric regression). All the models were adjusted for the variables presented in Table 2, and by age and clinical stage. Coefficients, 95% confidence interval (95% CI), and p values are presented, considering values of ≤ .05 to be statistically significant. All analyses were performed using STATA 14.2.

Table 2.  Linear and non-linear regression for stress response as a dependent variable  

  Muscle activity Skin conductance  
Emotional stressor Cognitive stressor Emotional stressor Cognitive stressor
Independent variables C (CI 95%) C (CI 95%) C (CI 95%) C (CI 95%)
Age NA -.07 (-.12- -.02)* -.41 (-.77- -.06)* -.31 (-.57- -.05)*
BRCa-RSxM 1.76 (.76-2.76)** 1.1 (.02-2.18)* 8.04 (1.36-14.72)* 5.73 (.03-11.42)*
Overall quality of life .04 (.01-.07)* NA NA NA
Perceived stress .1 (.04-.17)** NA .51 (.06-.97)* NA
Social quality of life .04 (.01-.07)** .04 (.01-.07)* .27 (.09-.45)** .24 (.08-.41)**
Perspective Coping -.05 (-.15-.01)* NA -.42 (-.78- -.06)* -.55 (-.92-.19)**

Notes: C = regression coefficient; CI = confidence interval; NA = not applicable;

*p ≤ .05.

**p ≤ .01,

***p ≤ .001. Only linear regression was applied for muscle activity in emotional stressor.

Results

Sociodemographic and clinical characteristics

Fifty-five women with a confirmed BRCa diagnosis were recruited, five of whom were excluded (three patients after the evaluation showed that their clinical data failed to meet the inclusion criteria, and two due to technical problems in the data analysis). The final sample comprised 50 patients, divided into two groups: 25 with BRCa and 25 with BRCa and RSxM (Figure 1).

Figure 1. Patient recruitment flow diagram. 

The BRCa group was significantly younger (45 years) than the comorbidity group (52 years) (t = -2.31, p ≤ .05). Most of the patients with BRCa had completed high school (36%) and were employed (52%), while the BRCa-RSxM group had finished elementary school (32%) and were housewives (56%). Both groups of patients were married and the majority were Mexico City residents ( Table 3).

Table 3.  Sociodemographic and clinical characteristics of the sample  

  BRCa (n=25) BRCa-RSxM (n=25)  
Mean (SD) or n (%) Mean (SD) or n (%) Statistical
Age 46.24 (9.59) 53 (11.03) t = -2.31*
Educational attainment
Elementary school 3 (12) 8 (32) X2(3) = 2.22 NS
Middle school 8 (32) 5 (20)  
High school 9 (36) 7 (28)  
University 5 (20) 5 (20)  
Occupation
Housewife 12 (48) 14 (56) X2(1) = .32 NS
Employee 13 (52) 11 (44)  
Marital status
Single 14 (40) 10 (40) F(3) = 1.07 NS
Married 15 (60) 15 (60)  
Sleep disturbance 12 (48) 17 (68) X2(1) = 2.05 NS
Does exercise 10 (40) 7 (28) X2(1) = .80 NS
Type of cancer
Ductal carcinoma 22 (88) 18 (72) F(1) = 2.4 NS
Lobular carcinoma 1 (4) 4 (16)  
Other 2 (8) 3 (12)  
Clinical stage
0-I, II 18 (72) 19 (76) F(3) = 4.77 NS
III-IV 7 (28) 6 (24)  
Hours of sleep 6.24 (2.63) 6.2 (2.27) U = .57 NS
Systolic pressure 109.64 (14.27) 119.68 (13.01) t = -2.60*
Diastolic pressure 69.24 (8.92) 78.12 (7.47) U = -3.46***
Glucose 92 (7.01) 108.16 (24.70) U = -3.32***
BMI 25.31 (3.12) 29.89 (4.55) t = -4.15***

Notes: SD = standard deviation; BMI = Body Mass Index; F= Fisher’s Exact test; X2 = Chi square; t = Student’s t; U = Mann-Whitney U test; NS = Not significant

*p ≤ .05,

**p ≤ .01,

***p ≤ .001.

The groups were similar as regards lifestyle, sleeping habits, and physical activity. Most patients in both groups had ductal carcinomas and 50% of the women in each group had stage II cancer. The physiological values of comorbidity were significantly higher (p < .05) in BRCa-RSxM; on average, they had had 3.2 years of evolution of the disease.

Physiological and psychological differences between groups in stressful situations

Muscle activity in the two groups was similar during baseline 1 and the cognitive stressor. The BRCa-RSxM group showed significantly higher levels of muscle activation during recovery 1, emotional stressor, recovery 2, and baseline 2 (U = -2.69, p ≤ .01, t = -2.57, p ≤ .05, U = -2.45, p ≤ .05, t = -2.34, p ≤ .05, respectively). The greatest difference was observed in the emotional stressor (BRCa-RSxM = 4.58 [1.93], BRCa = 3.37 [1.36]).

Both reported moderate levels of perceived stress but the BRCa group reported higher levels of overall quality of life and physical and emotional functioning, without significant differences. Women with BRCa-RSxM reported significantly more symptoms in diarrhea (U = -2.81, p ≤ .01), and better sexual function (U = -2.53, p ≤ .05). The BRCa group used the positive approach more significantly as coping strategies (U = 2.05, p ≤ .05) ( Table 4).

Table 4.  Psychological and physiological variables of sample  

  BRCa (n = 25)   BRCa-RSxM (n = 25)  
Median (p25 - p75) or Mean (SD)   Median (p25 - p75) or Mean (SD) Statistical
General quality of life
Overall quality of life 75 (66.67 - 83.33)   66.67 (58.33 - 83.33) t = 1.56 NS
Physical functionality 100 (100 - 100)   100 (86.66 - 100) U = 1.51 NS
Role functionality 100 (100 - 100)   100 (100 - 100) U = 1 NS
Emotional functionality 66.66 (58.33 - 83.33)   66.67 (50 - 75) t = .64 NS
Cognitive functionality 100 (66.67 - 100)   83.33 (66.67 - 100) U = .22 NS
Social Functionality 100 (100 - 100)   100 (83.33 - 100) U = 1.22 NS
Fatigue 0 (0 - 22.22)   22.22 (11.11 - 22.22) U = -1.67 NS
Nausea and vomiting 0 (0 - 0)   0 (0 - 16.67) U = -1.42 NS
Pain 16.67 (0 - 16.67)   16.67 (0 - 33.33) U = -.89 NS
Dyspnoea 0 (0 - 0)   0 (0 - 33.33) U = -1.07 NS
Insomnia 0 (0 - 33.33)   33.33 (0 - 66.67) U = -1.67 NS
Loss of appetite 0 (0 - 0)   0 (0 - 33.33) U = -1.74 NS
Constipation 0 (0 - 33.33)   0 (0 - 33.33) U = -.58 NS
Diarrhea 0 (0 - 0)   0 (0 - 33.33) U = -2.81***
Financial difficulties 33.33 (0 - 33.33)   33.33 (0 - 66.67) t = -.98 NS
Specific quality of life
Body image 100 (83.33 - 100)   91.67 (91.67 - 100) U = .42 NS
Sexual function 66.67 (66.67 - 100)   100 (83.33 - 100) U = -2.53*
Sexual pleasure 50 (33.33 - 66.67)   100 (66.67 - 100) U = -1.67 NS
Perspective 33.33 (0 - 66.67)   33.33 (0 - 66.67) t = .42 NS
Side effects 14.29 (9.52 - 23.81)   14.29 (4.76 - 28.57) U = -.13 NS
Breast symptoms 25 (8.33 - 33.33)   16.67 (8.33 - 33.33) t = .78 NS
Brachial symptoms 0 (0 - 22.22)   11.11 (0 - 22.22) U = -1.22 NS
Hair loss 0 (0 - 33.33)   0 (0 - 33.33) U = .58 NS
Coping strategies
Acceptance 50.30 (45.07 - 55.53)   52.92 (42.45 - 58.15) U = -.29 NS
Positive approach 56.62 (50.47 - 58.67)   48.42 (38.17 - 56.62) U = 2.05*
Positive planning 52.31 (42.00 - 62.63)   48.88 (45.44 - 55.75) t = -.15 NS
Perspective 50.75 (44.24 - 60.52)   50.75 (37.73 - 60.52) t = .55 NS
Rumination 51.74 (44.77 - 55.23)   51.74 (44.77 - 58.72) t = -1.13 NS
Self-blame 44.87 (41.80 - 51.00)   47.93 (44.87 - 60.21) U = -1.38 NS
Perceived stress 21 (15 - 26)   24 (16 - 29) U = -1.34 NS
Stressful condition
Cognitive Stressor 19 (76)   19 (76) X2(1) = 0 NS
Emotional stressor 6 (24)   6 (24)  
Relaxation
Yes 19 (76)   17 (68) X2(1) = .40 NS
Relaxation technique
Functional 13 (52)   9 (36) X2(2) = 1.37 NS
Non-functional 12 (48)   16 (64)  
Stress level 6.84 (1.95)   6.56 (2.66) t = .42 NS
Level of relaxation 6.4 (2.65)   5.36 (3.38) U = .93 NS
Muscular activity
Adaptation 2.28 (1.07)   2.88 (1.55) U = -1.17 NS
Base Line1 3.07 (1.32)   3.83 (1.73) U = -1.76 NS
Cognitive Stressor 3.06 (1.63)   3.61 (1.59) U = -1.50 NS
Recovery1 2.28 (1.13)   3.32 (1.54) U = -2.69***
Emotional stressor 3.37 (1.36)   4.58 (1.93) t = -2.57*
Recovery2 2.63 (1.30)   3.65 (1.79) U = -2.45*
Base Line2 2.44 (.92)   3.36 (1.73) t = -2.34*
Relaxation 2.62 (1.22)   3.23 (1.55) U = -1.60 NS
Recovery3 2.76 (1.50)   3.42 (1.74) U = -1.52 NS
Skin conductance
Adaptation 7.06 (4.47)   6.51 (3.68) t = .45 NS
Base Line1 7.49 (4.83)   8.17 (5.67) t = -.43 NS
Cognitive Stressor 9.28 (6.08)   12.53 (11.63) U = -.41 NS
Recovery1 9.84 (7.08)   12.64 (11.06) U = -.50 NS
Emotional stressor 9.93 (6.99)   13.55 (12.69) U = -.57 NS
Recovery2 9.80 (7.13)   13.25 (14.17) U = -.36 NS
Base Line2 8.95 (7.15)   11.41 (11.73) U = -.39 NS
Relaxation 8.91 (7.48)   10.50 (10.36) U = -.34 NS
Recovery3 8.76 (7.60)   11.03 (14.27) U = -.43 NS

Notes: SD = standard deviation; X2 = Chi square; t = Student’s t; U = Mann-Whitney U test; NS = not significant;

*p ≤ .05,

**p ≤ .01,

***p ≤ .001.

Influence of psychological variables and comorbidity to stressful situations

According to the multivariate model for physiological assessment during stressful situations ‒ cognitive and emotional ‒ ( Table 2 ), the only values with a normal distribution were those for muscle activity during the emotional stressor, as a result of which a multiple linear regression was proposed.

Muscle activity during the emotional stressor, in the group with BRCa-RSxM, was 1.76 mvolts higher, in comparison with the group without comorbidity (C = 1.76, CI 95% [.76, -2.76], p ≤ .01). Muscle activity increased .1 mvolts for each perceived stress point (C = .1, CI 95% [.04, -.17], p ≤ .01), and .04 mvolts for each 1 unit increase on the Likert scale of overall quality of life (C = .04, CI 95% [.01, -.07], p ≤ .05) and quality of social life (C = .04, CI 95% [.01, .07] p ≤ .01) ( Table 2 ). Conversely, for each point of increase in frequency of use of the “perspective” coping style, muscle activity was reduced by .05 mvolts (C = -.05, CI 95% [-.15, -.01], p ≤ .05).

During the cognitive stressor, women with BRCa-RSxM presented .1 mvolt of greater muscle activity (C = 1.1, CI 95% [.02, -2.18], p ≤ .05); as well as .04 mvolts for each .01 increase in the intensity of presence of quality of social life (C = .04, CI 95% [.01, -.07], p ≤ .05). For each one-year increase in age, activity decreased by .06 mvolts (C = -.07, CI 95% [-.12, -.02], p ≤ .05).

Cognitive stressor conductance was five times higher in women with BRCa-RSxM (C = 5.73, CI 95% [.03, -11.42], p ≤ .05). In addition, for each 1-point increase in the presence of quality of social life, conductance increased .24 mS (C = .24, CI 95% [.08, -.41], p ≤ .01), and decreased .03 units for every one-year increase in age (C = -.31, CI 95% [-.57, -.05], p ≤ .05), and .55 for each point of increase in the frequency of use of perspective coping (C = -.55, CI 95% [-.92, -.19], p ≤ .01). Conductance during the emotional stressor showed a greater difference between the groups (C = 8.04, CI 95% [1.36, 14.72], p ≤ .05), with similar results to those of the cognitive stressor, as regards age and “perspective” coping style. Finally, for every increase in perceived stress and quality of social life, conductance increased by .51 and .27 mS (C = .51, CI 95% [.06, -.97], p ≤ .05; C = .27, CI 95% [.09, -.45], p ≤ .01, respectively) for this emotional condition.

Discussion and conclusion

The present study evaluated differences in the physiological and psychological response (in quality of life, perceived stress, and use of coping strategies) in stressful situations, among groups of patients, as well as the influence of these psychological variables and the disease (and/or comorbidity) in the physiological response to stressful situations.

Physiological and psychological differences between groups in stressful situations

Patients with comorbidity displayed significantly higher physiological activation, used certain adaptive coping strategies less frequently, and had similar levels of overall quality of life, yet better sexual function.

The high levels of muscle reactivity in the BRCa-RSxM group are consistent with the population with RSxM without cancer (Kaushik, Mahajan, Rajesh and Kaushik, 2004).

This may be due to comorbidity due to the increase or balance in the activity of the hypothalamic-pituitary-adrenal axis (Pasquali et al., 1996) or greater sympathetic innervation (Esler, Rumantir, Kaye, Jennings, Hastings, Socratous et al., 2001). It may also be due to the fact that 72% of the BRCa-RSxM group did not do exercise, a practice which creates less intense responses to stressors and faster recoveries (Stulrajter, Scholzova, Sleboda, Dlhos, & Miklanek, 1997).

The fact that patients with BRCa used the positive approach as a coping style more frequently coincides with several studies (Li, Zhu, Yang, He, Yi, Wang et al., 2015; Becerril et al., 2013; De Haro-Rodríguez, Gallardo-Vidal, Martínez-Martínez, Camacho-Calderón, Velázquez-Tlapanco, & Paredes-Hernández, 2014). This may have been because the BRCa-RSxM group was significantly older, since it is related to less use of adaptive strategies (De-Haro-Rodríguez et al., 2014).

The similarities between the groups as regards quality of life underscore the fact that suffering from metabolic disease does not affect this perception (Sat-Muñoz, Contreras-Hernández, Balderas-Peña, Hernández-Chávez, Solano-Murillo, Mariscal-Ramírez et al., 2011). This may be due to the fact that they still did not have health complications (years of evolution: 3.2 ± 6.3 years), they were controlled, and/or had not been recorded by the instrument built to evaluate the effects of cancer treatment.

Influence of psychological variables and comorbidity on stressful situations

Comorbidity and the quality of social life influenced the increase in activation, whereas age and coping decreased it.

The influence of comorbidity could act as a form of physiological vulnerability (Dubovsky, 1985), produced by the metabolic alterations and sedentary lifestyle that characterized patients. The quality of social life was understood as a reflection of the evaluation of the stressful stimulus, which results in the use of social support, which requires behavioral and emotional activation (reflected in muscle activation and conductance).

The decrease in physiological activation was understood as a result of patients’ “decreasing” the severity of the event (by comparing it with worse ones) during the emotionally stressful situation (Garnefski et al., 2002). This notion coincides with the fact that greater use of maladaptive strategies and emotional suppression increases physiological activation (Giese-Davis, Conrad, Nouriani, & Spiegel, 2008). Conversely, the influence of increasing years of age during the cognitive stressor may be a habituation response (Andreassi, 2007). In other words, patients optimized their energy in response to the stressors ‒ decreasing activation ‒, and the arithmetic task, which were familiar to them (as a result of their age and schooling).

Physiological vulnerability and the behavioral coping strategy increased activation levels. At the same time, cognitive coping strategies and previous learning were related to the decrease in physiological activity, which, in turn, depended on the type of stressor.

The discussion of these results may be limited by the lack of previous studies with which to contrast them. Uncontrolled variables may have influenced the results obtained: the evaluators’ knowledge of the study hypothesis, the time since the diagnosis and the use of medicines by comorbid patients.When the sample increase was explored in one group, no significant differences were observed, or in the data trend.

In this study, we found that the BRCa-RSxM group was found to be physiologically more reactive to stress, and psychologically similar as regards perceived stress, quality of life, and coping strategies to the BRCa group. Physiological vulnerability, coping strategies (behavioral and cognitive), and prior learning influenced the resulting reaction produced during the stressful situation. This supports the fact that the full understanding of the relationship of stress with health-disease processes requires incorporating the conceptualization of a complex interaction of biological, psychological, and social variables, confirming the theoretical proposals of Dubovsky (1985) and Sandín (1995).

When exploring the physiological and psychological stress responses ‒ recorded simultaneously ‒ we confirmed that they co-occur both positively (muscle activity and conductance with perception of stress) and negatively (coping styles with muscle activity and conductance) in response to exposure to a stressful situation. In both groups, the physiological pattern coincides with perception. The study also shows that this response is not altered in the recent diagnosis of oncological disease or in metabolic comorbidity.

However, the differences found show that suffering from a metabolic disease, as a prelude to an oncological disease, could cause physiological vulnerability which, in turn, predisposes a person to respond inadequately to stressful conditions. This is compounded by the effects of an inadequate cognitive evaluation of resources (social and personal), and the type of stressor.

Clinically, the results support the usefulness of interventions in newly diagnosed BRCa-RSxM patients, designed to modify the physiological reactions to events regarded as stressful. At a psychological level, the results show that the type of stressor, social-behavioral, and cognitive resources can be important therapeutic components.

Knowing how both groups of patients respond to stressful situations in the recent diagnosis is unprecedented; however, this study confirms that they perceive themselves as being stressed from the start of the cancer trajectory. It also makes it possible to determine the advisability of implementing interventions of a psychophysiological nature at this stage, such as biofeedback. This could help patients provide better adapted responses to future stressful situations, such as active treatment.

Acknowledgements

Acknowledgments The authors would like to thank Dr. Juan Enrique Bargalló, of the Instituto Nacional de Cancerología, for facilitating access to the Institution’s Breast Tumor Service. Thanks are also due to Nutritionist, Cindy Mariely Rodríguez Pacheco, of the Instituto Nacional de Cancerología, for her support in reviewing the document. The authors are also grateful to Psychologist Ángela Virginia Linares Buitrón, for her support with the data collection.

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Funding This study did not receive any type of institutional financing.

Received: August 07, 2018; Accepted: June 03, 2019

Correspondence: Carmen Lizette Gálvez-Hernández Cátedras-CONACyT-INCan, Instituto Nacional de Cancerología. Av. San Fernando 22. Col. Sección XVI, C.P. 14080, Ciudad de México, México. Phone: +52 (55) 5628 - 0400, ext. 34016 Email: lizettegalvezh@gmail.com

Conflict of interests The authors declare they have no conflict of interests.

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