当前位置： SCI文献检索 > MEDICINE AND SCIENCE IN SPORTS AND EXERCISE期刊下所有文献 > Foot Angle and Loading Rate during Running Demonstrate a Nonlinear Relationship.

Foot Angle and Loading Rate during Running Demonstrate a Nonlinear Relationship.

Abstract：

:Vertical loading rates are typically found to be lower in forefoot compared to rearfoot strikers, promoting the idea that forefoot striking is desirable and may reduce running injury risk. However, prior work using linear models has shown that foot inclination angle (FIA) at initial contact is a poor predictor of vertical loading rate, suggesting a more complex association exists. PURPOSE:To determine if a nonlinear model superiorly describes the relationship between FIA and average vertical loading rate (AVLR). Secondary analyses assessed the influence of sex and sport on the association between FIA and AVLR. METHODS:Whole body kinematics and vertical ground reaction forces were collected for 170 healthy National Collegiate Athletic Association Division I athletes (97 males; 81 cross-country runners) during treadmill running at 2.68, 3.35, and 4.47 m·s. Foot inclination angle and AVLR were calculated for 15 strides and averaged across strides for each limb. Polynomial mixed effects models assessed linear and nonlinear trends in the relationship between FIA and AVLR across the entire sample and accounting for sex and sport participation. RESULTS:Average vertical loading rate was lowest at the extremes of FIA (i.e., -15°, 20°), whereas greater AVLR were observed between 5° and 10°. The cubic model resulted in a significantly better fit than the linear model (P < 0.001). Average vertical loading rate was also more variable among FIA associated with rearfoot and midfoot strike than forefoot strike. Adding sex to the model did not influence model fit; though, controlling for sport minimally improved model fit. CONCLUSIONS:The relationship between FIA and AVLR is best represented by a cubic model. Consequently, FIA should be treated as a continuous variable. Reducing FIA into categories may misrepresent the relationship between FIA and other gait variables.

journal_name

Med Sci Sports Exerc

journal_title

Medicine and science in sports and exercise

authors

Stiffler-Joachim MR,Wille CM,Kliethermes SA,Johnston W,Heiderscheit BC

doi

10.1249/MSS.0000000000002023

subject

Has Abstract

pub_date

2019-10-01 00:00:00

pages

2067-2072

issue

eissn

0195-9131

issn

1530-0315

pii

00005768-201910000-00011

journal_volume

pub_type

杂志文章

在线工具

Foot Angle and Loading Rate during Running Demonstrate a Nonlinear Relationship.