After 3 first month without intervention and also during the time of hemodialysis, the patients star the exercise programe, the first part of the session, an exercise was carried out for cardiovascular work (pedaling on ergometer) and muscle toning, with special attention to the muscular development of the lower limbs (exercises with elastic bands and / or weighted ankles). The session increased in duration and intensity as the physical action program progressed throughout the duration of the permitted period (3 months) and always attending to the individual needs of each subject. In addition, each of the participants will be given a series of recommendations of exercise practice to be carried out during non-hemodialysis days, in order to complement the work done during the sessions.3 month later the investigator evaluated all the variable again (T3)

The 6MWT was used as a marker of endurance capacity. It was performed on a 17-meter corridor with marks on every meter, and time was measured with a chronometer. (ONstart 100, Geonaute, France). Participants were asked to cover the longest distance possible during six minutes by walking (not running) continuously and turning around at the final mark. No verbal encouragement was given during the test; however, feedback regarding the remaining time was available. Participants were allowed to rest during the test, and to use any ambulation aid that they used during daily life.

Maximal isometric handgrip force has been suggested as a useful tool for the continuous assessment of muscle mass and function in dialysis patients. It was measured in both hands using a manual dynamometer (T.K.K.5401, Takei Scientific Instruments, Japan) while participants were in a standing position, with the arm extended and parallel to the body, and without moving the wrist. They performed two maximal repetitions with each hand interspersed with one-minute rests, and the mean of all four trials was analyzed.

Changes in depression symptoms were assessed using the Beck Depression Inventory (BDI). In this self-reported questionnaire 21 items are rated on a four-point severity scale and summed to give a total score, being a higher score suggestive of more severe depression. The BDI has proven a valid depression screening tool in dialysis patients, being one of the most commonly used questionnaires to assess this condition in this patient population. The Scale of this questionaire is: No depression (0 - 13 points); Low depression (14 - 19 points); moderate depression (20 - 28 points); several depression (≥29 points)

Health-related QoL (HRQoL) was assessed using the Short-Form 12 (SF-12) health survey, a short version of the SF-36. A physical (PCS) and a mental component score (MCS) are calculated from this self-reported questionnaire. SF-12 has proven reliable and valid in dialysis patients, being associated with short-term and long-term mortality in this population. The questionnaire is divided into three dimensions which have the following scales: EQ-EVA (visual analog scale) scores from 0 to 100 where 0 is the worst health state imaginable and 100 the best state, EQ-Descriptive. Better state of health self-perceived (11111) and worse (33333) depending on the answers given in each one of the sections of the questionnaire and EQ-Index. Better health status: values of 1 or close to 1 and the states closest to death.

the State-Trait Anxiety Inventory (STAI), The score range ranges from 0 to 60 points, so that high scores reflect greater anxiety. The scores obtained are transformed into decatypes (10 decatypes).

Red blood cells, hemoglobin, hematocrit and mean corpuscular volume were determined from whole blood anticoagulated with EDTA in a Sysmex XI-1000i hematological analyzer. with normal values for hemoglobin 14± 2 (g/dL) for women and of 16± 2 (g/dL) for men, for hematocrit 42± 5 % for women and of 47± 6 % for men and for corpuscular volumen 90 ± 7 (fL) for women and for men.

Iron, albumin, calcium and phosphorus were made by spectrophotometry from serum in a Cobas Integra 400 device. , considered as normal values Total calcium mg/100 mL 8,5-10,5; Phosphorus mg/100 mL 2,2-4,4; albumin g/100 mL 3-5 and for Iron 60 a 170 mcg/dL

Transferrin was obtained in a Cobas Integra 400 device by immunoturbidimetry technique from serum, considered as normal values for men and women 200-400 mg/dL (23-45 mmol/L).

Ferritin and PTH were determined from serum by chemiluminescence technique using an Elecsys 2010 equipment. with normal values for ferritin 12-300 ng/mL for men and 12-200 ng/mL for women and for PTH 8 - 51 pg/mL (8 - 51 ng/L) for men and women.

The ions (Na +, K + and Cl-) were determined in serum using a Cobas Integra 400 device by means of a selective electrode module.

The transferrin saturation index (IST) was obtained through the following formula: IST (%) = (serum iron concentration (M)) / (2 x transferrin concentration (M)) * 100. considered as normal values for men and women 20 - 50%

The age in years; height in centimeters (tallimeter Ano Sayol SL, Barcelona, Spain); weight in kilograms (Inbody 720, Microcaya) and we can derive from this data the variable of Body Mass Index (BMI) calculated as weight (kg)/height (m2).

For determinate this variable of the body composition will be use a Bioelectrical impedance machine Inbody 720, Microcaya. The datas of Total Body Fat Index shown in percentage and kilograms.

For determinate this variable of the body composition will be use a Bioelectrical impedance machine Inbody 720, Microcaya. The datas of Fat Mass shown in kilograms. This is divided in upper limb and lower limb on both side (left and right) and Trunk Fat Mass.

For determinate this variable of the body composition will be use a Bioelectrical impedance machine Inbody 720, Microcaya. The datas of Total Muscle Mass shown in kilograms. This is divided in upper limb and lower limb on both side (left and right) and Trunk Muscle Mass.

It is assumed that they are linked to the center where the study will be conducted. However, the EXERNET questionnaire will be included and it does not have cut points since it collects general and descriptive data of the subject.