Clinical trial NCT00754585: The Effectiveness of the Logic Back™Support.
Official title: The Effectiveness of the Logic Back™Support in Promoting a Comfortable Neutral Low Back Position, Reduced Muscular Effort, Improved Performance, and Decreased Postural Shifts in Seating.
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Low Back Pain
Posture
Lead sponsor: Canadian Memorial Chiropractic College
Sponsor class: OTHER
Collaborators: name: Logic Back
name: McMaster University
First posted: 2008-09-18
Enrollment: 24
Sex: MALE
Minimum age (years): 20
Maximum age (years): 55
Standard ages: ADULT
Accepts healthy volunteers: yes
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Males only, ages between 20-55 years of age

Brief summary: Back pain and chair use are the second most important health factors for the aging workforce. Besides personal suffering, postural discomfort in the workplace reduces performance and productivity, both of which can be improved by raising comfort levels. In an attempt to improve comfort and reduce injury risk, ergonomic chairs are commonly equipped with lumbar supports in an attempt to support a "neutral" spine. However, people often alter their position when such a device is in place as they arch their back to conform to it. The Logic Back support offers a simple means to alter posture and reduce associated strain on the lower back during seated tasks by supporting the "Effortless Neutral Position" or the natural curvature of the low back. Although it has been used clinically by many practitioners, its effectiveness has yet to be shown by scientific study. The current work will help to understand if and why the Logic Back is effective and how it can become a low-cost solution to reduce the discomfort of those suffering from low back pain.

The purpose of this study is to determine the effectiveness of the Logic Back and the "Effortless Neutral Position" in improving comfort and functional performance during seated tasks, as compared to a standard, ergonomic chair.

Detailed description: Seventeen of the top Canadian occupations typically have workers sitting a significant proportion of their work day. An average of 30% of Ontario WSIB lost time claims since 1996 involve low back injury. The return to work objective for twenty percent of these patients requires prolonged sitting in their work stations. While a number of these studies have claimed a relationship between sitting and LBP, the relationship is complex. Back pain and chair use are the second most important health factors for the aging workforce. The odds ratio for LBP is estimated for seated tasks at 1.9721. Prolonged and monotonous, low-level mechanical loads associated with a seated posture are thought to provoke pain.

Besides personal suffering, postural discomfort in the workplace reduces performance and productivity, both of which can be improved by raising comfort levels. According to Corlett (2006), other lumbar supports do not exert enough pressure on the spine to actually change its configuration. However, the patient often alters their posture when such a device is in place as they arch their back to conform to it. The Logic Back support offers a simple means to alter posture and reduce associated strain on the lower back during seated tasks by promoting the neutral standing lordotic posture. Clinically, it has been shown to support the ENP or the natural standing lordotic posture. Although its clinical applicability has been accepted by many practitioners, its effectiveness in improving seated comfort and functional task performance has yet to be quantified in LBP patients who perform seated tasks. This study will help to understand why the Logic Back or ENP must be considered when planning return-to-work goals and methods to reduce first-time injury incidence in the workplace.

Eligibility criteria: Inclusion Criteria:

* Male
* Between ages of 20-55
* With or without lower back pain

Exclusion Criteria:

* Participants currently experiencing neck, shoulder or arm pain
* Participants who have low back pain of non-musculoskeletal origin

Primary outcomes:
measure: Seated CoP Shift Rate: The CoP wil be measured by use of a TEKSCAN CONFORMat system - a thin sensing mat that is placed on the chair surface and measures the relative pressure applied by the legs and buttocks during seated tasks.
timeFrame: 30 minutes
measure: Functional Performance (Task Repetition Frequency)- three dynamic, seated performance tests are used and include: Test 1 - "Waist level-Up", Test 2 - "Eye level-down", and Test 3 - "Overhead work".
timeFrame: 5 minutes
Secondary outcomes:
measure: Self-Reports of Comfort: Tests such as the Visual Analog Scale (VAS) or mapping by body area will be used. Participants will also be asked to record their current level of discomfort on a 10cm VAS for each body area.
timeFrame: 5 minutes
measure: Postural Quantification: Electromagnetic sensors (Polhemus 3-space Isotrak system) will allow for the continuous and automatic monitoring of key body landmark positions and orientations in space.
timeFrame: 2 minutes
measure: RMS-EMG (Muscular Exertion): Following standard skin preparation (shaving as needed, alcohol cleansing and mild abrasion) surface electrodes (10 mm Ag-AgCL, 1 cm interspace) will be applied and oriented parallel to the target muscles.
timeFrame: 2 minutes
measure: Evaluation of Spinal Loads: Load on the spine is a combined effect of the posture, muscle activity and task being performed. The UM3D model is a validated lift task analysis system.
timeFrame: 2 minutes
Other outcomes:
Locations:
city: Hamilton
country: Canada
facility: McMaster University
state: Ontario
city: North York
country: Canada
facility: Canadian Memorial Chiropractic College
state: Ontario
Study officials:
References:
citation: Grondin DE, Triano JJ, Tran S, Soave D. The effect of a lumbar support pillow on lumbar posture and comfort during a prolonged seated task. Chiropr Man Therap. 2013 Jul 4;21(1):21. doi: 10.1186/2045-709X-21-21.