The functional demand (FD) placed on the knee and hip of older adults during everyday activities

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    Age-related decline in physical capacity and diminishing physiological reserves may increase the demand placed on lower extremity joints during everyday activities. This study aimed to characterize the FD at the knee and hip joints of older adults during various mobility activities. Eighty-four healthy participants (60–88 years) performed strength tests using a custom-built dynamometer. Biomechanical assessment of gait, chair rise (CR) and sit-down (CSt), stair ascent (SA) and descent (SD) was performed using an 8-camera VICON system (120 Hz) and Kistler force plates. Comparisons between groups (60s, 70s and 80s) were made using ANOVA. The FD was defined as the muscle moment generated during a task, divided by the maximum isometric strength (expressed as a percentage). FD was higher in the 80s age group compared to those in the 60s. The demand on hip and knee extensors was normally higher than those of flexors across all the activities. The knee extensor demand during gait (101%), SA (103%) and SD (120%), and hip extensor demand during gait (127%) were high requiring moments in excess of the maximum isometric muscle strength available at these joints. FD during CR and CSt was comparatively lower with knee extensor demands of 73% and 69% and hip extensor demands of 88% and 51%, respectively. Gait, SA and SD placed high demands on the knee extensors while hip extensor demand was high for gait, CR, CSt and SA. The levels of demand leave little reserve capacity for the older adult to draw on in unexpected circumstances.
    LanguageEnglish
    Pages192–197
    Number of pages6
    JournalArchives of Gerontology and Geriatrics
    Volume57
    Issue number2
    DOIs
    Publication statusPublished - 1 Sep 2013

    Fingerprint

    Gait
    Hip
    Knee
    demand
    Joints
    Infant Equipment
    Hip Joint
    Muscle Strength
    Knee Joint
    Lower Extremity
    Analysis of Variance
    Healthy Volunteers
    Age Groups
    Muscles
    age group

    Keywords

    • FD
    • functional demand
    • gait
    • stair negotiation
    • muscle strength
    • joint moment

    Cite this

    @article{11afde0adbc64b65a5ad4099ec58db7f,
    title = "The functional demand (FD) placed on the knee and hip of older adults during everyday activities",
    abstract = "Age-related decline in physical capacity and diminishing physiological reserves may increase the demand placed on lower extremity joints during everyday activities. This study aimed to characterize the FD at the knee and hip joints of older adults during various mobility activities. Eighty-four healthy participants (60–88 years) performed strength tests using a custom-built dynamometer. Biomechanical assessment of gait, chair rise (CR) and sit-down (CSt), stair ascent (SA) and descent (SD) was performed using an 8-camera VICON system (120 Hz) and Kistler force plates. Comparisons between groups (60s, 70s and 80s) were made using ANOVA. The FD was defined as the muscle moment generated during a task, divided by the maximum isometric strength (expressed as a percentage). FD was higher in the 80s age group compared to those in the 60s. The demand on hip and knee extensors was normally higher than those of flexors across all the activities. The knee extensor demand during gait (101{\%}), SA (103{\%}) and SD (120{\%}), and hip extensor demand during gait (127{\%}) were high requiring moments in excess of the maximum isometric muscle strength available at these joints. FD during CR and CSt was comparatively lower with knee extensor demands of 73{\%} and 69{\%} and hip extensor demands of 88{\%} and 51{\%}, respectively. Gait, SA and SD placed high demands on the knee extensors while hip extensor demand was high for gait, CR, CSt and SA. The levels of demand leave little reserve capacity for the older adult to draw on in unexpected circumstances.",
    keywords = "FD, functional demand, gait, stair negotiation, muscle strength, joint moment",
    author = "Dinesh Samuel and Philip Rowe and Alexander Nicol",
    year = "2013",
    month = "9",
    day = "1",
    doi = "10.1016/j.archger.2013.03.003",
    language = "English",
    volume = "57",
    pages = "192–197",
    journal = "Archives of Gerontology and Geriatrics",
    issn = "0167-4943",
    number = "2",

    }

    The functional demand (FD) placed on the knee and hip of older adults during everyday activities. / Samuel, Dinesh; Rowe, Philip; Nicol, Alexander.

    In: Archives of Gerontology and Geriatrics , Vol. 57, No. 2, 01.09.2013, p. 192–197.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - The functional demand (FD) placed on the knee and hip of older adults during everyday activities

    AU - Samuel, Dinesh

    AU - Rowe, Philip

    AU - Nicol, Alexander

    PY - 2013/9/1

    Y1 - 2013/9/1

    N2 - Age-related decline in physical capacity and diminishing physiological reserves may increase the demand placed on lower extremity joints during everyday activities. This study aimed to characterize the FD at the knee and hip joints of older adults during various mobility activities. Eighty-four healthy participants (60–88 years) performed strength tests using a custom-built dynamometer. Biomechanical assessment of gait, chair rise (CR) and sit-down (CSt), stair ascent (SA) and descent (SD) was performed using an 8-camera VICON system (120 Hz) and Kistler force plates. Comparisons between groups (60s, 70s and 80s) were made using ANOVA. The FD was defined as the muscle moment generated during a task, divided by the maximum isometric strength (expressed as a percentage). FD was higher in the 80s age group compared to those in the 60s. The demand on hip and knee extensors was normally higher than those of flexors across all the activities. The knee extensor demand during gait (101%), SA (103%) and SD (120%), and hip extensor demand during gait (127%) were high requiring moments in excess of the maximum isometric muscle strength available at these joints. FD during CR and CSt was comparatively lower with knee extensor demands of 73% and 69% and hip extensor demands of 88% and 51%, respectively. Gait, SA and SD placed high demands on the knee extensors while hip extensor demand was high for gait, CR, CSt and SA. The levels of demand leave little reserve capacity for the older adult to draw on in unexpected circumstances.

    AB - Age-related decline in physical capacity and diminishing physiological reserves may increase the demand placed on lower extremity joints during everyday activities. This study aimed to characterize the FD at the knee and hip joints of older adults during various mobility activities. Eighty-four healthy participants (60–88 years) performed strength tests using a custom-built dynamometer. Biomechanical assessment of gait, chair rise (CR) and sit-down (CSt), stair ascent (SA) and descent (SD) was performed using an 8-camera VICON system (120 Hz) and Kistler force plates. Comparisons between groups (60s, 70s and 80s) were made using ANOVA. The FD was defined as the muscle moment generated during a task, divided by the maximum isometric strength (expressed as a percentage). FD was higher in the 80s age group compared to those in the 60s. The demand on hip and knee extensors was normally higher than those of flexors across all the activities. The knee extensor demand during gait (101%), SA (103%) and SD (120%), and hip extensor demand during gait (127%) were high requiring moments in excess of the maximum isometric muscle strength available at these joints. FD during CR and CSt was comparatively lower with knee extensor demands of 73% and 69% and hip extensor demands of 88% and 51%, respectively. Gait, SA and SD placed high demands on the knee extensors while hip extensor demand was high for gait, CR, CSt and SA. The levels of demand leave little reserve capacity for the older adult to draw on in unexpected circumstances.

    KW - FD

    KW - functional demand

    KW - gait

    KW - stair negotiation

    KW - muscle strength

    KW - joint moment

    U2 - 10.1016/j.archger.2013.03.003

    DO - 10.1016/j.archger.2013.03.003

    M3 - Article

    VL - 57

    SP - 192

    EP - 197

    JO - Archives of Gerontology and Geriatrics

    T2 - Archives of Gerontology and Geriatrics

    JF - Archives of Gerontology and Geriatrics

    SN - 0167-4943

    IS - 2

    ER -