'existing research demonstrates' is a correct and usable phrase in written English.
It is typically used to introduce a statement or finding that is supported by previous studies or data. Example: "Existing research demonstrates that regular exercise can significantly improve cardiovascular health." In this sentence, the phrase 'existing research demonstrates' indicates that there is already evidence from past studies to support the statement that regular exercise is beneficial for heart health. This phrase is commonly used in academic or scientific writing, as well as in persuasive or informative essays.
The existing research demonstrates a gap in the literature on Halloween costumes, namely, the lack of work focusing on gender-differentiated revealing nature of adult costumes.
Taken in total the existing research demonstrates the viability of steel foams for use in civil/structural applications, while also pointing to areas where further research work is required.
Existing research demonstrates that engaging youth in elections before they reach the age of 18 can increase the likelihood of voting.
Because as the paper explains, "existing research demonstrates that cues in speech increase accurate understanding of mental states, [but] our experiments demonstrate that a person's voice reveals something more fundamental: the presence of a humanlike mind capable of thinking and feeling".
Existing research demonstrates also that the nature of the patient-proxy relationship does not affect patient-proxy agreement for HRQOL before ICU admission [ 1, 2, 28, 30].
Existing research demonstrates a general reduction in quality of life scores in the early period after ICU discharge, which usually slowly increase over the first two years after discharge [ 11, 12].
Much of what is offered in addiction "rehabilitation" programs has not been subject to rigorous scientific study, and the existing research demonstrating principles of effective treatment has not been widely adopted or integrated effectively into many of the treatment programs operating nationwide.
Existing research evidence demonstrates that the adoption and diffusion of new ideas and innovation is related to the patterns of communication within and across organisations[ 65].
Search, appraise and synthesise the existing research evidence 2.2.
These findings are largely consistent with existing research evidence.
Thus, existing research repeatedly demonstrates the compounding impact of the incarceration on the physical and mental health of prisoners, both while serving their sentence and following release.
