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Serial whole-body cryotherapy in fibromyalgia is effective and alters cytokine profiles

Abstract

Introduction

Whole-body cryotherapy (WBC) has shown to be beneficial in the treatment of fibromyalgia (FM). There is cumulative evidence that cytokines play a crucial role in FM. It’s unknown whether clinical effects of WBC can be demonstrated at the molecular level and how long the effects last.

Methods

We compared effects of serial WBC (6 sessions (− 130 °C in 6 weeks) in FM patients and healthy controls (HC). Primary outcome was the change in pain level (visual analogue scale 0–100 mm) after 6 sessions. Secondary outcomes were a change in disease activity (revised Fibromyalgia Impact Questionnaire) and pain after 3 sessions and 3 months after discontinued therapy and in cytokine levels (interleukin (IL-)1, IL-6, tumor necrosis factor α (TNF-α) and IL-10). The patients’ opinions on the satisfaction, effectiveness and significance of WBC were evaluated.

Results

Twenty-three FM patients and 30 HC were enrolled. WBC resulted in a significant reduction in pain and disease activity after 3 and 6 sessions. No clinical benefit could be measured 3 months after discontinued treatment. Overall, probands were satisfied with WBC and considered WBC to be important and effective. FM patients had significantly different levels of IL-1, IL-6, TNF-α and IL-10 at each reading point compared to HC. Levels of IL-1, IL-6 and IL-10 were significantly altered over time in FM patients. Compared to HC FM patients showed a significantly different response of IL1, − 6 and − 10 to WBC.

Conclusion

Serial WBC is a fast acting and effective treatment for FM. Proven effects of WBC may be explained by changes in cytokines.

Introduction

Fibromyalgia (FM) is a chronic pain syndrome. It is characterized by widespread pain and somatic symptoms such as fatigue, sleep disorders, cognitive impairment and depressive disorders [1]. Women around the age of 50 are affected more frequently [2, 3]. The global mean prevalence of FM is 2.7% [4]. Not only can FM lead to a high level of individual impairment, but it has been calculated that even a minimal increase in the Fibromyalgia Impact Questionnaire (FIQ) score increases costs in Europe by approximately €865 per year [5]. FM is therefore a problem of high social importance and represents a high economic burden [6].

The pathogenesis of FM is elusive. However, several factors seem to be of importance. These include abnormal pain sensitivity and pain inhibition [7, 8], a disturbed hypothalamic-pituitary-adrenal axis [9, 10] and cytokine dysregulation [11]. In addition, both genetic and environmental factors seem to play a role [7, 8]. Eventually, there is increasing evidence of neurogen- derived inflammatory mechanisms [12]. These affect peripheral tissues as well as the spinal cord and brain and involve a variety of neuropeptides, chemokines, and cytokines. Both the innate and adaptive immune system appear to be activated in this process [12] and could play an essential role. In neuropathic pain, for example, a balance between pro-inflammatory and anti-inflammatory cytokines is crucial, so that, an imbalance ultimately leads to pain and impaired pain processing [13, 14]. Indeed, in neuropathic pain models, pharmacological blocking of the pro-inflammatory cytokines interleukin (IL-)1, IL-6 and tumor necrosis factor α (TNF-α) has been found to prevent or reverse allodynia and hyperalgesia [15].

Whole-body cryotherapy (WBC) exposes patients to extremely cold dry air in an environmentally controlled chamber or cabin for a short period of time (usually between 1 and 5 min). The exposure to cold air induces vasoconstriction [16] and stimulation of dermal thermoreceptors, which leads to slower nerve conduction [17] ultimately resulting in an analgesic effect. So far, it has been used as a recovery technique after physical exercise [18] and has been successfully tested in inflammatory diseases such as rheumatoid arthritis [19, 20] and ankylosing spondylitis [19, 21]. In addition to its symptomatic and immediate effects, WBC has been shown to affect the immune system. In healthy controls WBC leads to an increase in white blood cell count, especially lymphocytes and monocytes. It also affects the overall oxidative and antioxidative status, which indicates an increased immune capacity [22]. Furthermore, WBC has an influence on cytokine levels: it has been shown to increase IL-6 and IL-10 levels and to decrease IL-1 α levels in healthy individuals [23]. In a pilot study, a significant improvement in IL-1 and TNF-α levels could be observed in patients with inflammatory rheumatic diseases [19]. At the other end of the thermotherapy spectrum, it has been shown that hyperthermia also alters cytokine levels [24]. Nowadays, physical therapy has been shown to change molecular parameters, which explains its profound and beneficial effects in rheumatic diseases [25].

Recently WBC has shown effects in the treatment of FM: it reduces pain [26, 27], fatigue [26] and improves health-reported quality of life [26,27,28]. Positive effects of serial WBC (10 sessions in 8 days) are still remarkable 1 month after discontinued treatment [28]. An effect on disease activity measured by the revised Fibromyalgia Impact Questionnaire (FIQR) has not yet been reported.

We conducted a controlled, prospective trial to investigate WBC’s effects on pain and disease activity and possible changes in molecular parameters (cytokine levels of IL-1, − 6, − 10 and TNF-α) in FM and healthy controls (HC). To evaluate the long-term effects, we also examined relevant parameters 3 months after WBC treatment.

Materials and methods

Participants

Patients with FM and HC were treated at Campus Kerckhoff of Justus-Liebig University Gießen, Dept. of Rheumatology, Immunology, Osteology and Physical Medicine. Eligible participants had to be between 18 and 80 years old. Only patients with primary FM were eligible and the diagnosis of primary FM had to be confirmed on the basis of the 2016 revised 2010/11 diagnostic criteria of FM [29]. HC was not allowed to have a medical history. In the case of women, a commitment not to become pregnant during the trial was obtained. We excluded patients with secondary FM, participants with a disease for which WBC is contraindicated, e.g. unstable coronary disease, heart attack in the last 6 months, active vasculitis or acute infection, participants with a body weight over 120 kg or intolerance to cold. All patients with FM had to be in stable pharmacological and non-pharmacological treatment 4 weeks prior to the start of the study. During the entire study period of 3 months no change in pharmacological treatment or non-pharmacological treatment (such as mind-body-therapy or meditative movement) was allowed. In addition, no physical therapy such as massages or multicomponent therapy was allowed during the entire duration of the study.

Study procedures

In this controlled prospective study, all participants received WBC treatment (6 sessions at − 130° for 3 weeks with 2 sessions/week). Outcomes were measured after 3 and 6 sessions and 3 months after discontinued therapy (follow-up).

WBC treatment was delivered using a cryosauna ‚ SPACE CABIN’ (~ 230 V, 50 Hz, serial number: 1050, year of manufacture: 2013) from Cryomed s.r.o., Slowakia. The therapy was delivered to participants in swimsuit/underwear and warm socks. Fingers were placed under the armpits during the treatment to avoid frost-damages. Temperatures between − 110 to − 170 °C can be applied. In this study, a fixed temperature of − 130 °C was selected. The first session was set at 90 s., the second at 120 s and from the third session onwards a time of 180 s (3 min) was set.

Assessments and outcomes

Primary outcome was a change in pain intensity measured by a visual analogue scale (VAS) from baseline after 6 WBC sessions in patients with FM. The measurement of pain intensity with a 10 cm VAS, visually representing the amplitude of pain (0 (best) to 100 (worst) mm) experienced by the subject [30] is well-established for FM [31]. The minimum clinically important difference (MCID) for pain intensity measured with VAS has been reported to be 2.1 points (respectively 21 mm) [32].

The secondary outcome was a change in the baseline pain level (VAS) after 3 sessions of WBC and 3 months of discontinued therapy in patients with FM. In addition, the disease activity measured by the FIQR was assessed after 6 sessions of WBC and after 3 months of discontinued therapy. The FIQR [33] evaluates 21 items in the 3 areas of function (n = 9), overall impact (n = 2), and symptoms (n = 10) of FM. Each item can be rated from 0 (best) to 10 (worst). The domain scores are then divided individually and added in a final step creating a total FIQR score from 0 (best) to 100 (worst). The results of the total FIQR can be adequately compared with the results of older papers reported using the original FIQR [33]. Thus, although no MCID for the FIQR has been reported, the MCID of a 14% change appears important for the FIQR [34].

The study used ELISA to detect changes in cytokine levels (IL-1, IL-6, IL-10 and TNF-α) in FM patients and HC after 3 and 6 WBC sessions and after 3 months of discontinued therapy. To reduce artificially altered cytokine levels, blood samples were immediately cooled and taken to the laboratory. For each sample taken, a time of less than 30 min from collection to centrifugation was recorded. Serum was centrifuged at 3500 rpm at 15 °C for 10 min and plasma was centrifuged at 2850 rpm at 4 °C for 15 min. The samples were stored at − 80 °C until further use. Cytokine levels (IL-10, IL-6, TNF-α and IL-1β/IL-1F2) were measured in sera using Quantikine® ELISAs (R&D Systems) according to the manufacturer’s instructions. Optical readings were taken with the SUNRISE (TECAN) system at 450 nm. So far it could be determined that FM patients apparently have different levels of cytokines compared to HC. However, there are neither established ranges of cytokines for FM patients nor a solid correlation between specific concentrations and disease activity [35].

After 6 WBC sessions, the subjective satisfaction, efficacy and significance of WBC were assessed.

Sample size

We calculated that a sample size of 18 will have 89,2% power to detect a difference in pain (VAS 0–10 cm) in means of 1,6, assuming a standard deviation of differences of 2, using a paired t-test with a 5% two-sided significance level. Assuming a dropout rate of 20% we aimed to recruit 20 patients. The considered difference in means and standard deviation are conservative estimates based on previous studies evaluation the reduction of pain (VAS) while treating FM by WBC. Calculations were performed in nQuery 8.

Statistical analysis

Summary statistics (mean, standard deviation, frequencies, and percentages) were used to describe the sample. Differences between groups were tested with t-tests assuming unequal variances. Differences to baseline were tested with t-tests for paired values. All p-values are displayed unadjusted. The global hypothesis was tested by analysis of variance (ANOVA) and p-values less than 0.05 were considered statistically significant. In paired comparisons the p-values are displayed without adjustment, but after Bonferroni-Holm adjustment for multiplicity,they are shown statistically significant. The analyses were performed with R Version 3.6.1.

Results

From July 2014 to July 2015 we screened 89 patients (32 HC and 57 patients with the diagnosis of FM). Of these, 57 participants (26 FM patients, 31 HC) met the inclusion criteria and were enrolled (Fig. 1). The main reason for the exclusion was that FM was in the background of an inflammatory rheumatic disease and was therefore not diagnosed as “primary FM” (Fig. 1). The mean age of the participants was 46±9.8 years, 66% were female.

Fig. 1
figure1

Trial enrollment and follow-up

In FM patients the mean duration of the disease was 13.9±8 years (n=23; disease duration: min. 1 year; max. 35 years). Three FM patients (nausea 1x, unspecific maculae 1x, private reasons 1x) and one HC (1x acute urinary infection) dropped out during treatment. A statistical analysis was therefore carried out with 23 FM patients and 30 controls (Fig. 1).

Primary outcome

The mean (±SD) pain levels measured by VAS in FM patients changed from 5.91±2.3 mm (confidence interval (CI) 4.9 to 6.92) at baseline to 3.43±2.8 mm (CI 2.2 to 4,7) after 6 WBC sessions (p< 0.0001). The MCID for pain levels of at least 2.1 was achieved.

Secondary outcomes

The mean (±SD) pain levels measured by VAS in FM patients changed from 5.91±2.3 mm (CI 4.9 to 6.92) at baseline to 4±2.7 mm (CI 2.8 to 5,2) after 3 WBC sessions (p=0.0016). The MCID for pain levels of at least 2.1 was not achieved.

3 months after the last WBC session, the pain levels measured by VAS were 71.7±1,89 mm (CI 6.3 to 8), rising to values above the baseline (p=0.0037) (Supplement-Table 1).

Disease activity assessed by FIQ decreased significantly from a mean (±SD) FIQ 60.7±18.4 at the start of the study to mean FIQ 48.5±23 after WBC treatment (p=0.0006). Three months after discontinued treatment the mean FIQ returned to baseline level of 64.1±15.4 (p=0.2142) (Fig. 2 and Supplement-Table 1). The MCID of 14% for a change in FIQ was missed (here 12.2%).

Fig. 2
figure2

Course of VAS (a) and FIQ (b)

IL-1 levels in FM patients decreased significantly after 3 WBC sessions and after 6 WBC sessions and remained significantly lower compared to baseline 3 months after discontinued WBC treatment. Interestingly, 3 months after the last WBC, IL-1 levels in both groups had decreased compared to baseline, although healthy controls showed no significant change during treatment. In comparison FM patients showed significantly higher IL-1 levels after 3 sessions and 3 months after the last WBC session than healthy controls at the start of treatment (see Fig. 3 and Supplemental Table 2).

Fig. 3
figure3

Course of IL-1 (a), IL-6 (b), TNF-α (c) and IL-10 (d)

IL-6 levels were decreased by WBC in both groups. While IL-6 levels in healthy individuals returned to baseline after 3 months without WBC, FM patients still showed decreased levels. In FM patients, IL-6 levels were significantly reduced by WBC after 3 sessions and after 6 sessions compared to baseline. 3 months after the last treatment IL-6 was also significantly improved. In contrast to healthy controls, FM patients showed significantly decreased IL-6 levels at each reading point compared to baseline (cf. Figure 3 and Supplement-Table 3).

TNF-α levels were not significantly decreased by WBC, neither in FM patients nor in healthy controls (cf. Figure 3 and Supplement-Table 4).

Levels of IL-10 in FM patients were significantly influenced after 3 WBC applications and 3 months after discontinued treatment. Compared to healthy controls, FM patients showed significantly higher IL-10 levels at baseline, after 6 WBC sessions and 3 months after the last WBC application (cf- Fig. 3 and Supplement-Table 5).

Taken together, in an analysis of mixed effects, the concentrations of IL-1, IL-6 and IL-10 as well as pain (VAS) and disease activity (FIQ) were significantly altered over time by WBC treatment. FM patients had significantly different levels of IL-1, IL-6, TNF-α and IL-10 at each reading point compared to healthy controls. Most interestingly, FM patients showed a significantly different response to WBC compared to healthy controls in terms of changes in IL1, − 6 and − 10 to WBC over time (cf. Table 1).

Table 1 Mixed effects analysis of group effects (Fibromyalgia vs. Healthy Control) and time effects (Baseline, 3 Applications, 6 Applications, 3 Months) as well as interaction. A significant interaction effect indicates differences in value development/performance over time depending on the cohort

Subjective satisfaction, efficacy and significance of WBC

After completing WBC treatment, patients were asked to report on their subjective satisfaction with WBC treatment and on the subjective effectivness and significance of WBC treatment. Most patients were highly satisfied with WBC and perceived WBC as an effective and highly important treatment option (cf. Figure 4).

Fig. 4
figure4

Patient’s report on satisfaction, efficacy, and significance of WBC treatment

Discussion

This trial, which examined the clinical and molecular effects of WBC in FM patients and HC, showed that serial WBC (6 sessions) resulted in a significant and clinically important pain reduction in FM patients. Secondary outcomes showed that disease activity is significantly reduced by WBC and that the effects on pain are significantly manifested after only 3 WBC sessions. The subjects were satisfied with WBC and considered WBC to be important and effective. FM patients had significantly different levels of IL-1, IL-6, TNF-α and IL-10 at each reading point compared to HC. Levels of IL-1, IL-6 and IL-10 were significantly altered over time in FM patients. In comparison to healthy controls, FM patients showed a significantly different response in IL1, − 6 and − 10 levels to WBC.

Three previous studies have already tested the effect of WBC on FM, but with different settings. Bettoni et al. treated recruited patients with mandatory aerobic exercise (cycloergometer or treadmill) for 30 min immediately after WBC treatment [26]. Because aerobic exercise is effective in the treatment of FM [36] and physical activity could have influenced WBC treatment by vasodilatation as opposed to WBC-induced vasoconstriction, the distinct role of WBC in the effects observed in this study was limited. Therefore, we tested without background physical therapy throughout the study and had patients in stable treatment before and during the trial. In the study of Rivera et al. the cross-over design did not work because of too short wash-out periods: patients treated with WBC did not initially return to baseline with regard to VAS and FIQ, so that only results of the first sequence could be reported [27]. Vitenet et al. only treated 11 FM patients with WBC to investigate changes in the Medical Outcome Study Short Form-36 and, which is why the study is limited due to sample size [28]. So far, only Rivera et al. investigated effects of WBC on FIQ [27] and only Vitenet et al. included a follow-up showing effects of WBC 1 month after discontinued treatment [28]. The clinically beneficial effects of WBC in this study appear to be consistent with previous studies.

This study is limited by the absence of an FM control group, that would not receive WBC. As previous studies already tested such settings and thus demonstrated the proposed clinical benefits of WBC, we focused on a slightly different aspect in this study and investigated molecular effects of WBC in addition to the clinical effects. Thus, we first had to confirm the clinical effects of WBC in order to test the molecular effects in comparison to a healthy control group in a second step.

In our study the acceptance of WBC was high, as most patients reported to be highly satisfied with WBC while perceiving WBC as an effective and highly important treatment option. Therefore, WBC seems to be an effective tool to improve disease activity. Interestingly, a reduction of pain and disease activity was reported after only 3 sessions with a prolonged effect with increasing serial applications. Since patients with FM are partially impaired in their ability to work [37] and a minimal increase in the FIQ score increased costs by approximately €865 per year [5], cost-effective WBC can be of great benefit in the treatment of acute exacerbations of FM in an individual, but it can also be important in a social perspective.

Until now, it was not known how long the beneficial effects of WBC on FM would last after treatment. Rivera et al. had problems with their cross-over design as the washout period of 1 week for the first WBC group proved to be too short, confirming an effect of WBC for at least 1 week. Vitenet et al. showed that effects of serial WBC (10 sessions over 8 days) lasted for over 1 month after the last treatment [28]. Our study shows that 3 months after stopping treatment, effects of WBC on pain and disease activity were no longer reduced. Hence, serial WBC (between 6 and 10 sessions in up to 3 weeks) had effects for more than 1 month after termination of WBC treatment, which then decreased over time and were not effective after 3 months.

Overall, WBC seems to be a clinically valid, good and fast-acting treatment for FMS.

In the pathogenesis of FM-related hyperalgesia, central pain amplification, known as central sensitization, plays a major role [8, 38,39,40]. Additionally, an imbalance of pro- and anti-inflammatory cytokines plays a role in pain induction and maintenance and is known to be altered in FM [11, 35]. Prostaglandin synthesis is increased by IL-1 alone or in combination with TNF-α. It regulates substance P gene expression, thereby lowering the pain threshold in peripheral nerves [41]. In addition, the injected IL-1 causes fever, headache, myalgia and arthralgia [42] – symptoms that FM patients regularly experience. In this context, IL-1RA (IL-1 receptor antagonists) have been found to be higher in FM patients [43]. So far, not all FM patients have been found to have elevated TNF-α [11, 44], but the use of TNF inhibitors has been shown to be less effective in secondary FM [45]. IL-6 can be associated with hyperalgesia, depression stress, fatigue and sympathetic nervous system activation. Several studies have therefore measured IL-6 levels in FM – with varying results. Overall, a meta-analysis by Üceyler et al. favoured the detection of elevated plasma levels of IL-6 in FM [35]. Interleukin-10 (IL-10) inherits many anti-inflammatory properties. The expression of substance P is regulated by IL-10 in a way that the pain threshold is increased. Furthermore, IL-10 decreases the production of IL-1, IL-6 and TNF-α. In addition, WBC has proven to have an influence on cytokines in healthy controls [23].

While previous studies hypothesized the cause of WBC effects in FM [26,27,28], we found that WBC treatment significantly altered not only disease activity but also levels of IL-1, IL-6 and IL-10 over time. FM patients had significantly different levels of IL-1, IL-6, TNF-α and IL-10 at each reading point compared to healthy controls. These differences in cytokines we found correlate well with a study by Ernberg et al. comparing circulating cytokines between FM and healthy controls with the mentioned findings of Üceyler et al. [35] and Lubkowska et al. [23]. Ernberg et al. investigated the effect of 15 weeks of progressive resistance exercise or relaxation therapy on cytokine levels in FM patients and HC without significant alterations in cytokines and clinical outcomes in FM patients [44]. In accordance with our findings, Ernberg et al. found that FM patients had significantly different levels of cytokines compared to HC, which play a substantial role in inflammation but also pain modulation [44]. As IL-1, IL-6 and IL-10 play an essential role in pain, the observed changes could clearly explain the observed efficacy of WBC.

Conclusion

WBC is effective in FM and reduces the burden of disease. The effects of serial WBC are strongest during application and are diminished 3 months after WBC treatment. Moreover, the significant long-term alteration of IL-1, IL-6 and IL-10 by WBC could explain these beneficial effects.

Availability of data and materials

Data and material can be requested from PK on reasonable request.

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Acknowledgements

We thank all participants.

Consent to participate

Study details and protocol were verbally explained to all participants and written information sheets were delivered. Written informed consent was obtained from each participant.

Consent to publication

Consent to publication was obtained from all participants and all authors.

Registration

The study was retrospectively registered DRKS00021218 at www.drks.de (German Clinical Trials Register) on the 8th of April 2020.

Funding

Not applicable. The study did not receive any funding.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by PK, JB, GD, TA and UL. The first draft of the manuscript was written by PK, UL and IA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Philipp Klemm.

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The study was conducted in accordance to the Declaration of Helsinki and approved by the Medical Ethical Comittee of Justus-Liebig-University Gießen (registration number AZ 09/14).

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All author declare no conflicts of interest.

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Klemm, P., Becker, J., Aykara, I. et al. Serial whole-body cryotherapy in fibromyalgia is effective and alters cytokine profiles. Adv Rheumatol 61, 3 (2021). https://doi.org/10.1186/s42358-020-00159-z

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Keywords

  • Whole-body cryotherapy
  • Fibromyalgia
  • Cytokines
  • Physical therapy
  • Fibromyalgia impact questionnaire
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