CezardaCosta 2019.

Study characteristics
Methods	Study design: randomised controlled trial Study grouping: parallel group
Participants	Baseline characteristics Stretching exercise Age (mean ± SD): 35.5 ± 9.5 Sex (N (% female)): NR Sample size: 20 Years of experience (up to 3 years, 4‐7 years, ≥ 8 years): 20 (100%), 0 (0%), 0 (0%) Control (no intervention) Age (mean ± SD): 37.8 ± 8.9 Sex (N (% female)): NR Sample size: 19 Years of experience (up to 3 years, 4‐7 years, ≥ 8 years): 19 (100%), 0 (0%), 0 (0%) Overall Age (mean ± SD): NR Sex (N (% female)): NR Sample size: 39 Years of experience (up to 3 years, 4‐7 years, ≥ 8 years): 39 (100%), 0 (0%), 0 (0%) Included criteria: to participate in the research, NPs could not present any medical impediment to performing physical exercises and not participating in any kind of physical activity oriented during the research. Those individuals who were absent from classes for three consecutive sessions for any reason were excluded. Excluded criteria: NR Pretreatment: NR Compliance rate: the frequency of the students was recorded in all classes. The participant who missed three or more consecutive classes was excluded from the investigation; however, the only person excluded from the study was even allowed participating in the classes Response rate: NR Type of healthcare worker: exclusively nurses
Interventions	Intervention characteristics Stretching exercise Type of the intervention: Intervention type 2 ‐ to focus one’s attention away from the experience of stress Description of the intervention: The members of the EG participated in MS classes for eight weeks, with 40‐minute sessions containing active and static stretching exercises under the supervision and guidance of a Physical Education teacher. The classes were offered for three days a week and each member attended at least two days a week. The frequency of the students was recorded in all classes. The participant who missed three or more consecutive classes was excluded from the investigation; however, the only person excluded from the study was actually allowed to participate in the classes. In each session, eight exercises with four sets of 30 seconds and 30 seconds intervals were given, as recommended by the American College of Sports Medicine (2013). Active and static stretching exercises were directed to the body segments in general. The body segment was slowly moved up to a certain range of motion with slight tension (muscle discomfort), remaining in the position The number of sessions: 16‐24 Duration of each session on average: 40 min Duration of the entire intervention: 8 weeks Duration of the entire intervention short vs long: Short Intervention deliverer: a Physical Education teacher Intervention form: Group, face‐to‐face Control (no intervention) Type of the intervention: NA Description of the intervention: NA The number of sessions: NA Duration of each session on average: NA Duration of the entire intervention: NA Duration of the entire intervention short vs long: NA Intervention deliverer: NA Intervention form: NA
Outcomes	Occupational Stress Scale (OSS) Outcome type: ContinuousOutcome
Identification	Sponsorship source: Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ Country: Brasil Setting: The State Institute of the Brain Paulo Niemeyer (IEC). Comments: NR Authors name: Flávia Porto Institution: Instituto de Educação Física e Desportos, Universidade do Estado do Rio de Janeiro Email: laviaporto30@gmail.com Address: Rua São Francisco Xavier, 524, Sala 9122F, Maracanã, CEP 20550‐900, Rio de Janeiro, RJ, Brasil Time period: NR
Notes	OSS included in analysis 2.1
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "They were chosen from a list of random numbers generated in software (Microsoft Excel 2010, São Paulo, Brazil)."
Allocation concealment (selection bias)	Unclear risk	Quote: "The volunteers were randomly assigned to the experimental group (EG: n = 20, 35.5 ± 9.5 years old, 69.9 ± 13.7 kg and 1.62±0.5m) and the control group (CG: n = 19, 37.8±8.9 years old, 81.8±15.4 kg and 1.68±0.9m). They were chosen from a list of random numbers generated in software (Microsoft Excel 2010, São Paulo, Brazil). The CG was submitted to the same evaluation as the EG. However, they did not participate in the classes of muscle stretching (MS). There was no blinding of participants and evaluators; however, it was considered that it did not influence the outcome of the study." Difficult to judge whether participants and/or investigators could possibly foresee assignment
Blinding of participants and personnel (performance bias) All outcomes	High risk	Quote: "There was no blinding of participants and evaluators; however, it was considered that it did not influence the outcome of the study." Participants were not blinded.
Blinding of outcome assessment (detection bias) All outcomes	High risk	Quote: "(MS). There was no blinding of participants and evaluators; however, it was considered that it did not influence the outcome of the study." Participants were not blinded whereas outcomes are self‐reported.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Quote: "The participant who missed three or more consecutive classes was excluded from the investigation; however, the only person excluded from the study was even allowed participating in the classes."
Selective reporting (reporting bias)	Low risk	Trial registration. No indication of selective reporting.
Other bias	Unclear risk	Response rate not reported.