title: Do lower-extremity joint dynamics change when stair negotiation is initiated with a self-selected comfortable gait speed?
abstract: Previous research on the biomechanics of stair negotiation has ignored the effect of the approaching speed. We examined if initiating stair ascent with a comfortable self-selected speed can affect the lower-extremity joint moments and powers as compared to initiating stair ascent directly in front of the stairs. Healthy young adults ascended a custom-built staircase instrumented with force platforms. Kinematics and kinetics data were collected simultaneously for two conditions: starting from farther away and starting in front of the stairs and analyzed at the first and second ipsilateral steps. Results showed that for the first step, participants produced greater peak knee extensor moment, peak hip extensor and flexor moments and peak hip positive power while starting from farther away. Also, for both the conditions combined, participants generated lesser peak ankle plantiflexor, greater peak knee flexor moment, lesser peak ankle negative power and greater peak hip negative power while encountering the first step. These results identify the importance of the starting position in experiments dealing with biomechanics of stair negotiation. Further, these findings have important implications for studying stair ascent characteristics of other populations such as older adults.
authors.affiliation: Nebraska Biomechanics Core Facility, School of Health, Physical Education and Recreation, College of Education, University of Nebraska at Omaha, Omaha, NE 68182, USA.
authors.forename: Srikant
authors.initials: S
authors.lastname: Vallabhajosula
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Yentes
authors.forename: Mira
authors.initials: M
authors.lastname: Momcilovic
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Blanke
authors.forename: Nicholas
authors.initials: N
authors.lastname: Stergiou
mesh_terms: D000054:Acceleration; D000328:Adult; D000843:Ankle Joint / Q000502:physiology; D001696:Biomechanical Phenomena; D005260:Female; D005684:Gait / Q000502:physiology*; D006621:Hip Joint / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D035002:Lower Extremity / Q000502:physiology*; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D016059:Range of Motion, Articular / Q000502:physiology*; D012016:Reference Values; D012494:Sampling Studies; D055815:Young Adult