Abstract
Purpose: Evaluate the effect of target speed and verbal instruction on near point of convergence (NPC) measurements in a young, healthy, and active population. Methods: NPC was measured in 20 individuals with three target speeds and two sets of verbal instruction. The target speeds used were 1 cm/s, 3 cm/s, 5 cm/s, and participant self-paced. The verbal instruction given was either to indicate when the target became “double” or “blurry”. Results: Paired-samples t-tests revealed significant differences between 5 cm/s (5.44 ± 2.01) and 1 cm/s (6.72 ± 2.39, p = .003), 3 cm/s (6.10 ± 2.36, p = .030) and self-paced (6.63 ± 2.26, p = .005). A significant difference (p < .001) was also found between the “double” (6.72 ± 2.39) and “blurry” (10.82 ± 3.08) conditions. Conclusion: For young, healthy and active individuals, target speed and verbal instruction matter when measuring NPC.
Highlights
A concussion can present clinically in a myriad of ways across a range of domains, including clinical symptoms, physical signs, cognitive impairment, neurobehavioral features, and sleep/wake disturbances (McCrory et al, 2016)
An estimated 10,500 (Zuckerman et al, 2015) and 135,000 (Gessel, Fields, Collins, Dick, & Comstock, 2007) concussions occur at the NCAA and high school levels, respectively
The dependent variable is near point of convergence (NPC) measures under the varying conditions
Summary
A concussion can present clinically in a myriad of ways across a range of domains, including clinical symptoms, physical signs, cognitive impairment, neurobehavioral features, and sleep/wake disturbances (McCrory et al, 2016). An estimated 10,500 (Zuckerman et al, 2015) and 135,000 (Gessel, Fields, Collins, Dick, & Comstock, 2007) concussions occur at the NCAA and high school levels, respectively. Traditional assessment models recommend a focus on symptomology, cognition, and postural control (Broglio et al, 2014; Harmon et al, 2013). Received April 1, 2019; Published October 23, 2019 Citation: McGinnis, I. The effect of target speed and verbal instruction on NPC measures in a young, healthy, and active population.
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