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- Title
Arch Height and Maximum Rearfoot Eversion During Jogging in 2 Static Neutral Positions.
- Authors
Sae Yong Lee; Hertel, Jay
- Abstract
Context: Clinically, lowering of the medial longitudinal arch is believed to be closely related to rearfoot eversion. However, the relationship between arch height and rearfoot eversion during gait is unclear. Objectives: (1) To examine the influence of 2 reference positions (weight-bearing neutral position [WBNP] and sub- talar neutral position [STNP]) on maximum rearfoot eversion, tibial internal rotation, knee flexion, knee internal rotation, and dorsiflexion-plantar flexion of ankle joint measures during jogging and (2) to compare the relationships among static arch height, navicular drop, and the 2 maximum rearfoot eversion measures. Design: Crossover study. Setting: Gait laboratory. Patients or Other Participants: Thirty-three volunteers between 18 and 40 years of age. Intervention(s): Each participant stood on the treadmill in 2 static positions: WBNP and STNP. Kinematic data were obtained using a 10-camera motion analysis system (120 Hz) when participants jogged at 2.65 m/s on the treadmill in bare feet. Main Outcome Measure(s): Rearfoot and shank angular kinematics, navicular drop, and static arch height. Results: Maximum rearfoot eversion was greater (WBNP: 4.03° ±2.58°, STNP: 10.91° ±5.34°) when STNP was the static reference (P<.001). A strong correlation was seen between maximum STNP eversion and navicular drop (r= 0.842) but not between WBNP and navicular drop (r=0.216). Differences were noted in dorsiflexion and knee kinematics during gait between the static references; however, the effect sizes were low, and the mean differences were smaller than 2°, which was less than 5% of total excursion during gait. Conclusions: Using STNP rather than WBNP as the reference position affects estimates of frontal-plane rearfoot movement but not other ankle or knee motions in jogging.
- Publication
Journal of Athletic Training (National Athletic Trainers' Association), 2012, Vol 47, Issue 1, p83
- ISSN
1062-6050
- Publication type
Academic Journal
- DOI
10.4085/1062-6050-47.1.83