In the acupuncture experimental group, the technique applied included the use of the following acupuncture points of Traditional Chinesse Medicine: GV20, ST36 and BL60 . One needle insertion was performed in each session and in the case of the last two points the needle insertions were done bilaterally.

Patients laid supine on a treatment table with their legs exposed. The skin on the acupuncture points was prepared with 70% ethyl alcohol. One-time-use disposable sterile stainless steel needles (0,26x50mm) were inserted into acupuncture points.

After insertion, acupuncture needles were manually manipulated to obtain the de qi sensation. The needles remained in place for 20 minutes and there were no further manipulations during the retention time.

The physiotherapy experimental group received core stability based physiotherapy treatment. Before the beginning of the treatment sessions, the basic principles of core stability exercises were explained to the participants. The exercise programme included 7 exercises. The exercises in the crook lying position were core activation with breathing, single leg lift with knees bent, single leg slides, bridging and knee drop sideways. The exercises completed in side lying included hip external rotation with knees bent and hip abduction with knees straight. After each session gentle stretching of the lower limbs and lumbar spine were performed. The sessions were administered twice a week during 30 minutes with groups of no more than 8 people.

The control group did not receive any intervention. The participants continued with their routine medical treatment.

Acupuncture 5 weeks treatment. 2 sessions a week (30 minutes each session)

Static balance and postural control is the ability to maintain the centre of gravity within the base of support. Centre of gravity is measured in percentage through posturography study

Static balance and postural control is the ability to maintain the centre of gravity within the base of support. Monopodal stance test measures static balance in percentage through posturography study.

Dynamic balance is the ability to maintain the centre of gravity within the base of support during the performance of functional activities. Berg Balance scale measures dynamic balance through performing multiple tasks and with a score of 0 to 56.

Time up and Go test measures dynamic balance showed in seconds

10 meter walk test measures walking speed and performance which is related to dynamic balance. The unit use is meter/second.

The Spanish Fibromyalgia Impact Questionnaire measures the quality of life and the impact of Fibromyalgia on the life of persons diagnosed with this condition. The maximum score is 100 and the higher the result obtained, the higher the impact of the condition on the person and the less quality of life he/she has.