The effects of increased forward trunk lean during stair ascent on hip adduction and internal rotation in asymptomatic females

Lee T. Atkins, Jacob Reid, Dustin Zink

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Increased hip adduction and internal rotation can lead to excessive patellofemoral joint stress and contribute to patellofemoral pain development. The gluteus maximus acts as a hip extensor, abductor, and external rotator. Improving hip extensor use by increasing one's forward trunk lean in the sagittal plane may improve frontal and transverse plane hip kinematics during stair ascent. Research question: Does increasing forward trunk lean during stair ascent affect peak hip adduction and internal rotation? Methods: Twenty asymptomatic females performed five stair ascent trials (96 steps/min) on an instrumented stair using their self-selected and forward trunk lean postures. Three-dimensional kinematics (200 Hz) and kinetics (2000 Hz) were recorded during the stance phase of stair ascent. Biomechanical dependent variables were calculated during the stance phase of stair ascent and included peak forward trunk lean, hip flexion, hip adduction, hip internal rotation angles, and the average hip extensor moment. Results: During the forward trunk lean condition, decreases were observed for peak hip adduction (MD = 2.8˚; 95% CI = 1.9, 3.8; p < 0.001) and peak hip internal rotation (MD = 1.1˚; 95% CI = 0.1, 2.2; p = 0.04). In contrast, increases were observed during the forward trunk lean condition for the peak forward trunk lean angle (MD = −34.7˚; 95% CI = −39.1, −30.3; p < 0.001), average hip extensor moment (MD = −0.5 N·m/kg; 95% CI = −0.5, −0.4; p < 0.001), and stance time duration (MD = −0.02 s; 95% CI = −0.04, 0.00; p = 0.017). Significance: Increasing forward trunk lean and hip extensor use during stair ascent decreased peak hip adduction and internal rotation in asymptomatic females. Future studies should examine the effects of increasing forward trunk lean on hip kinematics, self-reported pain, and function in individuals with patellofemoral pain.

Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalGait and Posture
Volume97
DOIs
StatePublished - Sep 2022

Keywords

  • Forward trunk lean
  • Hip kinematics
  • Stair ascent

Fingerprint

Dive into the research topics of 'The effects of increased forward trunk lean during stair ascent on hip adduction and internal rotation in asymptomatic females'. Together they form a unique fingerprint.

Cite this