Sitting posture and changes in respiratory function

• Register: REBEC
• Last refreshed on: 29 April 2013
• Main ID: RBR-3bms6f
• Date of registration: 13/11/2011
• Primary sponsor: Universidade de São Paulo - Brazil
• Public title: Sitting posture and changes in respiratory function
• Scientific title: Sitting position and respiratory function in two significantly different chair-table system
• Date of first enrolment: 05/04/2010
• Target sample size: 15
• Recruitment status: data analysis completed
• URL: http://www.ensaiosclinicos.gov.br/rg/RBR-3bms6f/
• Study design: Clinical trial, single arm, randomized, uni-blinded

Countries of recruitment

Brazil

Contacts

• Name: Fátima Caromano
• Affiliation: Universidade de São Paulo

• Name: Adriana Contesini
• Affiliation: Laboratório de Fisioterapia e Comportamento da FMUSP

Key inclusion & exclusion criteria

Inclusion criteria: Female university students, aged between 18 and 25 years, regularly enrolled in a public University, healthy, Caucasian, right-handed, sedentary, with body mass index between 18.5 to 24.9 kg/m2
Exclusion criteria: Diseases of the respiratory system or musculoskeletal system

Age minimum: 18Y
Age maximum: 25Y
Gender: F

Health Condition(s) or Problem(s) studied

Respiratory function and sitting posture
G11.427.695
G09.772.770.755.700

Intervention(s)

15 volunteers participated in the study. The participants were divided into three groups by drawing lots. Each group attended for five consecutive days for evaluation, which occurred between 9 am and 11 am. In this study each subject served as its own control. Were evaluated changes of respiratory function in two different table-chair systems, the first being a conventional system (system A) that matched the classic concept of table-Chair system ideal for staying in sitting posture, in which the chair leads to an angle of approximately 90° bending of hips and knees, and an experimental system (system B) which featured chair with 50 cm height above the ground, seat with inclination of 30° from the horizontal, support to the knees with inclination of 25° from the horizontal, table with top in 20° of inclination.
Measures were carried out using height and weight balance clinic with bound height gauge and the identification, through palpation of anatomical points to be assessed, in accordance with the program tutorial SAPO adapted, being used, the following points: tragus, C7, acromion, lateral epicondyle, distal portion of the ulna, greater trochanter of the femur, knee joint line and medial malleolus, which were marked with stickers and styrofoam balls of 1 cm in right hemibody.
The participants remained at rest in dorsal decubitus for five minutes, the end of which held a pulmonary function test in orthostatic position using a spirometer and expiratory portable. Then they sat on furniture drawn and held, for three minutes, a graphical activity designed to divert the attention of participants with respect to their posture. At the end of this period was held new battery of respiratory tests, in furniture in question.
After new rest of 5 minutes the procedure was repeated in the second furniture. The participants were filmed in right side using digital camera and, from the images obtained, postural assessment was carried out by means of photogrammetry in each o

Primary Outcome(s)

In relation to the sitting posture, this study evaluated by means of photogrammetry, joint angles relating to anteriorização of the head, trunk flexion in relation to the vertical, flexion of the shoulder, elbow flexion and knee flexion, featuring the most frequent attitude of each subject for each of the furnitures, according to the group's average posture. The analysis of images, itself, was performed, using the program AutoCAD 2010 for the measurement of angles relating to anatomical points previously demarcated. These tariff estimating angles were their simple average and standard deviation and by establishing the attitude of individuals in each average furniture.
In relation to respiratory function were evaluated variables: forced vital capacity, forced expiratory volume in first second, Fev1/FVC ratio, forced expiratory flow between 25% and 75% of maximum expiratory flow and CVF.

Secondary Outcome(s)

In comparing the values of joint angles obtained in sitting posture in two furnitures and the data obtained in the spirometric evaluation, based on the parameters evaluated, was used paired samples analysis by comparing values in orthostatic position with values in each of the furniture assessed, the values obtained from the two furnitures between itself and the values of each of the two subgroups found in conventional furniture.
It was examined whether the data obtained in pulmonary assessment for each furniture. Since this analysis did not provide statistically significant difference for none of the 15 participants, we worked with the average of the individual values for each variable in each furniture.

Secondary ID(s)

0886/08

Source(s) of Monetary Support

Laboratório de Fisioterapia e Comportamento da FMUSP - Brazil

Secondary Sponsor(s)

Laboratório de Fisioterapia e Comportamento da FMUSP - Brazil