Participants performed mindfulness meditation during lunch break at work place for a month, beginning with 15 minutes and ending with 30 minutes. They had available a "quiet room" and mp3 audios with guided meditations based on the MBSR program.

Participants performed physical exercises during lunch break at a gym for a month, beginning with 15 minutes and ending with 30 minutes. They were instructed to do cardio exercise such as running through a park or going to the gym for running, rowing, cycling or elliptical exercise. 20-140 beats per minute must be reach.

Participants continue their normal lunch routine.

Guided mindfulness meditation focused on breath sensations, thoughts and emotions.

Validation of the Spanish version of the Perceived Stress Questionnaire of Levenstein et al. (1993). It is a scale to measure stress in psychosomatic disorders. It consists of 30 items, with Likert responses from 1(almost never) to 4 (almost always). The Spanish version has 6 factors: Harrassment-social acceptance, Overload, Irritability-tension-fatigue, Energy-Joy, Fear-anxiety, Self-realization-satisfaction. The higher score, the higher perceived stress.

Recovery Experience Questionnaire (Sonnentag et al. 2007) is a measure for assessing recuperation from work. It has 16 items divided into four subscales: psychological detachment, relaxation, mastery and control. Each subscale has 4 items. Every items has a 5-point scale from 1 (I do not agree al all) to 5 (I fully agree). Higher scores indicates a higher degree of recovery from work stress.

Short version of General Health questionnaire. It has 12 items divided into three subscales: Stress, Coping strategies and Self-steem. Every item has a Likert scale to answer from 0 to 3. Higher scores indicates worse general health.

Level changes from Baseline to 1 month follow-up. Samples were collected in Salivettes -trademark- (a plastic tube with a swab) twice a day: in the morning (round 7am) and after work (round 7pm). There were collected two Salivettes every of the three moment of measuring (pretest, postest and 1 month follow-up). That means there were taken 6 tubes for every participant.