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Effect of spa therapy with saline balneotherapy on oxidant/antioxidant status in patients with rheumatoid arthritis: a single-blind randomized controlled trial

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Abstract

Oxidative stress has been shown to play a contributory role in the pathogenesis of rheumatoid arthritis (RA). Recent studies have provided evidence for antioxidant properties of spa therapy. The purpose of this study is to investigate whether spa therapy with saline balneotherapy has any influence on the oxidant/antioxidant status in patients with RA and to assess clinical effects of spa therapy. In this investigator-blind randomized controlled trial, we randomly assigned 50 patients in a 1:1 ratio to spa therapy plus standard drug treatment (spa group) or standard drug treatment alone (control group). Spa group followed a 2-week course of spa therapy regimen consisting of a total of 12 balneotherapy sessions in a thermal mineral water pool at 36–37 °C for 20 min every day except Sunday. All clinical and biochemical parameters were assessed at baseline and after spa therapy (2 weeks). The clinical parameters were pain intensity, patient global assessment, physician global assessment, Health Assessment Questionnaire disability index (HAQ-DI), Disease Activity Score for 28-joints based on erythrocyte sedimentation rate (DAS28–4[ESR]). Oxidative status parameters were malondialdehyde (MDA), nonenzymatic superoxide radical scavenger activity (NSSA), antioxidant potential (AOP), and superoxide dismutase (SOD). The NSSA levels were increased significantly in the spa group (p = 0.003) but not in the control group (p = 0.509); and there was a trend in favor of spa therapy for improvements in NSSA levels compared to control (p = 0.091). Significant clinical improvement was found in the spa group compared to the control in terms of patient global assessment (p = 0.011), physician global assessment (p = 0.043), function (HAQ-DI) (p = 0.037), disease activity (DAS28–4[ESR]) (0.044) and swollen joint count (0.009), and a trend toward improvement in pain scores (0.057). Spa therapy with saline balneotherapy exerts antioxidant effect in patients with RA as reflected by the increase in NSSA levels after spa therapy; whether this antioxidant effect contributes to the clinical improvements observed remains to be verified.

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Abbreviations

AOP:

Antioxidant potential

CO2 :

Carbon dioxide

CRP:

C-reactive protein

DAS28–4:

Disease Activity Score for 28-joints of 4 variables

DMARD:

Disease-modifying antirheumatic drug

ESR:

Erythrocyte sedimentation rate

H2S:

Hydrogen sulfide

HAQ-DI:

Health Assessment Questionnaire Disability Index

MDA:

Malondialdehyde

NaCl:

Sodium chloride

NBT:

Nitroblue tetrazolium

NSSA:

Nonenzymatic superoxide radical scavenger activity

RA:

Rheumatoid arthritis

RNS:

Reactive nitrogen species

ROS:

Reactive oxygen species

SD:

Standard deviation

SOD:

Superoxide dismutase

TCA:

Trichloroacetic acid

TNF :

Tumor necrosis factor

VAS :

Visual analog scale

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Karagülle, M., Kardeş, S., Karagülle, O. et al. Effect of spa therapy with saline balneotherapy on oxidant/antioxidant status in patients with rheumatoid arthritis: a single-blind randomized controlled trial. Int J Biometeorol 61, 169–180 (2017). https://doi.org/10.1007/s00484-016-1201-4

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