BACKGROUND - When the human body is in motion, the transfer of energy and force occurs in a series as a kinetic chain, such as in a kicking motion where the trunk, hip, knee, and ankle are working together to produce one task. Thus, when an impairment occurs at one point along the chain, it will impact the proximal and distal segments in the series. Besides the kicking motion, another example of a functional movement is the single leg squat (SLS). For the SLS to be successful, the need for adequate hip strength and adequate knee and ankle range of motion (ROM) is imperative. Previous literature has found a correlation between hip strength and ankle range of motion deficits. However, there has been limited research regarding a correlative study utilizing a 3D motion analysis system, specifically examining hip strength and ankle ROM during a SLS. The primary purpose is to assess and correlate the knee flexion angle during a SLS to hip strength and ankle ROM in a generally healthy population. The secondary purpose is to determine if there is a correlation between hip strength and ankle ROM. METHODS - Seventy-five participants, aged 18-40, will be recruited for this study. Participants must be in good health and capable of performing a SLS determined by a screening process. Participants must have no previous history of lower extremity musculoskeletal surgery or a current lower extremity injury. Each participant will be asked to participate in one session, examining ankle dorsiflexion ROM, hip extensor strength, hip abductor strength, and knee flexion angle during a SLS. Ankle dorsiflexion ROM will be measured using a smartphone inclinometer app (iHandy level). Hip extensor and abductor strength will be measured using an externally fixated handheld dynamometer. The SLS will be 3D motion analyzed using the VSTPro™ video analysis device. Data will be analyzed using a one-tailed correlation statistical test. ANTICIPATED RESULTS - The following positive correlations are anticipated: (a) hip abductor strength and SLS depth (knee flexion angle); (b) ankle dorsiflexion ROM and SLS depth (knee flexion angle); and (c) hip abduction and hip extension strength and ankle dorsiflexion ROM.Grant or funding information: Funding received from WKU College of Human and Health Sciences Quick Turn-Around Grant (QTAG)

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