The phrase "a back support" is grammatically correct and can be used in written English.
It is typically used to refer to an object or device that provides support to one's back, such as a brace or cushion. Example: "After injuring her back, Jane had to wear a back support to relieve the pain and discomfort."
The responses of the body seated without a back support, also revealed notable influences of excitation magnitude, particularly on the primary peak frequencies.
The international standard, ISO-5982 (2001), defines such ranges for very limited conditions, namely for body seated without a back support and exposed to vertical vibration.
Wearing a back support to prevent strain, he said he had been "throwing snow as high as I can get it".
From the start of his tenure, audiences had to adjust to seeing him conduct while seated in a conductor's chair with a back support.
The biodynamic response of human body seated without a back support and exposed to vertical whole-body vibration have been standardized in ISO 5982 and DIN 45676 in terms of driving-point mechanical impedance and apparent mass.
This paper addresses the functionality of Artificial Neural Network (ANN) for prediction of seated body apparent mass under different levels of vibration excitations in the 0.5 20 Hz frequency range, while assuming two different sitting postures (with and without a back support).
Overall, the length scales associated with stratification were found to be much larger than that of the reaction zone and flame, resulting in a quasi-homogeneous propagation, predominantly in a back supported stratified combustion regime.
He also wears a back-support corset because, as Twain, he must stoop slightly.
As a bonus, the pillows have a detachable back support pillow for Mom and a built-in privacy cover.
Subjects were seated in a chair with a lumbar back support and straps at the level of the shoulders, pelvis and thighs to minimize unwanted movement.
The subject was seated in a chair with their back on a low back support, their head and shoulders in a neutral position, their hands on their thighs, and their feet on the floor.
