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Open AccessArticle

Handedness, Grip Strength, and Memory Function: Considerations by Biological Sex

Exercise & Memory Laboratory, Department of Health, Exercise Science and Recreation Management, The University of Mississippi, University, MS 38677, USA
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Medicina 2019, 55(8), 444; https://doi.org/10.3390/medicina55080444
Received: 12 June 2019 / Revised: 18 July 2019 / Accepted: 1 August 2019 / Published: 6 August 2019
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Abstract

Background and Objective: The objective of this study was to evaluate the potential independent and interactive effects of handedness and grip strength on episodic memory function, and whether biological sex moderated these relationships. Materials and Methods: 162 young adults (Mage = 20.7 years) completed a series of memory assessments including a subjective memory complaint evaluation and several objective measures of memory. Handedness (i.e., left-hand dominant, inconsistent handedness (ICH), and right-hand dominant) was evaluated using the Edinburgh Handedness Inventory. Handgrip strength was determined from a handgrip dynamometer. Results: When compared to ICH individuals, retrospective memory scores were statistically significantly worse for left-handed (p = 0.02) and right-handed (p = 0.03) individuals. Higher grip strength was statistically significantly associated with fewer retrospective memory complaints (b = 0.10, 95% CI: 0.01, 0.19, p = 0.04). Conclusions: The present study provides some suggestive evidence that ICH (inconsistent handedness) and greater grip strength are associated with fewer retrospective memory complaints. However, we did not observe any evidence of an interaction effect of handedness and grip strength on memory, and similarly, biological sex did not interact with these parameters to influence memory. View Full-Text
Keywords: cognition; interhemispheric activation; muscular strength cognition; interhemispheric activation; muscular strength
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Loprinzi, P.D.; Franklin, J.; Farris, A.; Ryu, S. Handedness, Grip Strength, and Memory Function: Considerations by Biological Sex. Medicina 2019, 55, 444.

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