Limits in reliability of leg-spring and joint stiffness measures during single-leg hopping within a sled-based system

Autor: Andrew J. Harrison, Ross Anderson, David Diggin
Rok vydání: 2019
Předmět:
Male
Research Validity
Kinematics
Knee Joints
Stiffness
0302 clinical medicine
Skeletal Joints
Medicine and Health Sciences
Musculoskeletal System
Reliability (statistics)
Mathematics
Multidisciplinary
Physics
Strong consistency
Classical Mechanics
Structural engineering
Research Assessment
Ankle Joints
Healthy Volunteers
Spring (device)
Physical Sciences
Medicine
Legs
Female
Anatomy
medicine.symptom
Research Article
Adolescent
Science
Materials Science
Material Properties
Research and Analysis Methods
Pelvis
Young Adult
03 medical and health sciences
Consistency (statistics)
medicine
Mechanical Properties
Humans
Exercise
Leg
Hip
Weak consistency
business.industry
Ankles
Biology and Life Sciences
Reproducibility of Results
Repeated measures design
030229 sport sciences
Body Limbs
Joint stiffness
Exercise Test
Joints
business
030217 neurology & neurosurgery
Zdroj: PLoS ONE
PLoS ONE, Vol 14, Iss 12, p e0225664 (2019)
ISSN: 1932-6203
DOI: 10.1371/journal.pone.0225664
Popis: Research examining the reliability of stiffness measures during hopping has shown strong consistency in leg-spring stiffness (kleg), but high variability in joint stiffness (kjoint) measures. Sled-based systems (SBS) reduce movement degrees-of-freedom and are used to examine stretch-shortening cycle (SSC) function under controlled conditions. The aim of this study was to examine the reliability of kleg and kjoint during single-leg hopping within an SBSKinematic and kinetic data were collected on four occasions (Day_1, Day_2, Day_3 and Day_3Offset). Participants completed two trials of single-leg hopping at different frequencies (1.5, 2.2 and 3.0 Hz) while attached to an inclined-SBS. Stiffness was determined using models of leg-spring (kleg) and torsional (kjoint) stiffness. Statistical analysis identified absolute and relative measures of reliability. Results showed moderate reliability for kleg at 1.5 Hz between inter-day testing bouts, and weak consistency at 2.2 and 3.0 Hz. Examination of intra-day comparisons showed weak agreement for repeated measures of kleg at 1.5 and 2.2 Hz, but moderate agreement at 3.0 Hz. Limits in kleg reliability were accompanied by weak-to-moderate agreement in kjoint measures across inter- and intra-day testing bouts. Results showed limits in the reliability of stiffness measures relative to previous reports on overground hopping. Lack of consistency in kleg and kjoint may be due to the novelty of hopping within the current inclined-SBS. Constraints imposed on the hopping task resulting from SBS design (e.g. additional chair mass, restricting upper body movement) may have also influenced limits in kleg and kjoint reliability. Researchers should consider these findings when employing inclined-SBS of a similar design to examine SSC function.
Databáze: OpenAIRE
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