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Knee strength capabilities and slip severity.

Authors
Wyszomierski-SA; Chambers-AJ; Cham-R
Source
J Appl Biomech 2009 May; 25(2):140-148
NIOSHTIC No.
20039865
Abstract
Slips and falls are a serious public health concern in older populations. Reduced muscle strength is associated with increased age and fall incidence. Understanding the relationships between specific joint muscle strength characteristics and propensity to slip is important to identify biomechanical factors responsible for slip-initiated falls and to improve slip/fall prevention programs. Knee corrective moments generated during slipping assist in balance recovery. Therefore, the study goal was to investigate the relationship between knee flexion/extension strength and slip severity. Isometric knee flexion/extension peak torque and rate of torque development (RTD) of the slipping leg were measured in 29 young and 28 older healthy subjects. Motion data were collected for an unexpected slip during self-paced walking. Peak slip velocity (PSV) of the slipping heel served as a slip severity measure. Within-sex and age group regressions relating gait speed-controlled PSV to strength of the slipping leg revealed significant inverse PSV-knee extension peak torque and PSV-knee flexion/extension RTD relationships in young males only. Differences in PSV-strength relationships between sex and age groups may be caused by greater ranges of strength capabilities in young males. In conclusion, the ability to generate higher, more rapid knee flexion/ extension muscle moments (greater peak torque/RTD) may assist in recovery from severe slips.
Keywords
Accidents; Physiology; Physiological-factors; Physiological-function; Age-groups; Humans; Men; Women; Muscles; Muscle-function; Muscular-disorders; Musculoskeletal-system; Musculoskeletal-system-disorders; Physical-capacity; Knee-injuries; Knee-disorders
CODEN
JABOEG
Publication Date
20090501
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007592
Issue of Publication
2
ISSN
1065-8483
Source Name
Journal of Applied Biomechanics
State
PA
Performing Organization
University of Pittsburgh
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