Variable Changes in Body Composition, Strength and Lower-Body Power During an International Rugby Sevens Season

John A Mitchell, Kate L Pumpa, Kym J Williams, David B Pyne

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    This study determined whether body composition, strength, and power changes that occur during preseason can be maintained during an international rugby sevens season. Fourteen male international rugby sevens players (age 21.4 ± 2.2 years; mean ± SD) were categorized as forward (n = 7) or back (n = 7), and assessed for height, mass (M), skinfolds (S) (∑7), upper-body (UB) strength, lower-body (LB) strength, and LB power. Bench press, back squat, and a countermovement jump were used to measure strength and power at 3 time points: initial, early season, and late season. Forwards were taller (185 ± 4 cm), heavier (95 ± 6 kg), and possessed a greater lean body mass (55.5 ± 4.0 M·S) than backs (181 ± 8 cm, 88.5 ± 5.5 kg, and 51.9 ± 3.4 M·S). Over the full season, small (∼5 ± 5%; mean ± 90% confidence limits) positive changes occurred in body composition. Lower-body strength gained during the preseason, decayed in-season, whereas UB strength increased moderately (∼10 ± 3%) across the season. Power showed inconsistencies between measured variables with a moderate positive change across the season in mean velocity and relative peak power. Forwards showed a small decrease in peak power (relative and absolute). Moderate changes were observed in mean power over the season, forwards decreasing (∼6 ± 6%) and backs increasing (∼8 ± 6%). Rugby sevens forwards in this study found it difficult to maintain and improve power qualities in-season. Training loads of forwards and backs should be differentiated to maximize strength and power in-season.

    Original languageEnglish
    Pages (from-to)1127-1136
    Number of pages10
    JournalJournal of Strength and Conditioning Research
    Volume30
    Issue number4
    DOIs
    Publication statusPublished - Apr 2016

    Fingerprint

    Football
    Body Composition

    Cite this

    @article{ad533961733b4fa685470f88b4b02b22,
    title = "Variable Changes in Body Composition, Strength and Lower-Body Power During an International Rugby Sevens Season",
    abstract = "This study determined whether body composition, strength, and power changes that occur during preseason can be maintained during an international rugby sevens season. Fourteen male international rugby sevens players (age 21.4 ± 2.2 years; mean ± SD) were categorized as forward (n = 7) or back (n = 7), and assessed for height, mass (M), skinfolds (S) (∑7), upper-body (UB) strength, lower-body (LB) strength, and LB power. Bench press, back squat, and a countermovement jump were used to measure strength and power at 3 time points: initial, early season, and late season. Forwards were taller (185 ± 4 cm), heavier (95 ± 6 kg), and possessed a greater lean body mass (55.5 ± 4.0 M·S) than backs (181 ± 8 cm, 88.5 ± 5.5 kg, and 51.9 ± 3.4 M·S). Over the full season, small (∼5 ± 5{\%}; mean ± 90{\%} confidence limits) positive changes occurred in body composition. Lower-body strength gained during the preseason, decayed in-season, whereas UB strength increased moderately (∼10 ± 3{\%}) across the season. Power showed inconsistencies between measured variables with a moderate positive change across the season in mean velocity and relative peak power. Forwards showed a small decrease in peak power (relative and absolute). Moderate changes were observed in mean power over the season, forwards decreasing (∼6 ± 6{\%}) and backs increasing (∼8 ± 6{\%}). Rugby sevens forwards in this study found it difficult to maintain and improve power qualities in-season. Training loads of forwards and backs should be differentiated to maximize strength and power in-season.",
    keywords = "Athletic Performance, Body Composition, Football, Humans, Lower Extremity, Male, Muscle Strength, Young Adult, Journal Article",
    author = "Mitchell, {John A} and Pumpa, {Kate L} and Williams, {Kym J} and Pyne, {David B}",
    year = "2016",
    month = "4",
    doi = "10.1519/JSC.0000000000001188",
    language = "English",
    volume = "30",
    pages = "1127--1136",
    journal = "Journal of Strength and Conditioning Research",
    issn = "1064-8011",
    publisher = "NSCA National Strength and Conditioning Association",
    number = "4",

    }

    Variable Changes in Body Composition, Strength and Lower-Body Power During an International Rugby Sevens Season. / Mitchell, John A; Pumpa, Kate L; Williams, Kym J; Pyne, David B.

    In: Journal of Strength and Conditioning Research, Vol. 30, No. 4, 04.2016, p. 1127-1136.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Variable Changes in Body Composition, Strength and Lower-Body Power During an International Rugby Sevens Season

    AU - Mitchell, John A

    AU - Pumpa, Kate L

    AU - Williams, Kym J

    AU - Pyne, David B

    PY - 2016/4

    Y1 - 2016/4

    N2 - This study determined whether body composition, strength, and power changes that occur during preseason can be maintained during an international rugby sevens season. Fourteen male international rugby sevens players (age 21.4 ± 2.2 years; mean ± SD) were categorized as forward (n = 7) or back (n = 7), and assessed for height, mass (M), skinfolds (S) (∑7), upper-body (UB) strength, lower-body (LB) strength, and LB power. Bench press, back squat, and a countermovement jump were used to measure strength and power at 3 time points: initial, early season, and late season. Forwards were taller (185 ± 4 cm), heavier (95 ± 6 kg), and possessed a greater lean body mass (55.5 ± 4.0 M·S) than backs (181 ± 8 cm, 88.5 ± 5.5 kg, and 51.9 ± 3.4 M·S). Over the full season, small (∼5 ± 5%; mean ± 90% confidence limits) positive changes occurred in body composition. Lower-body strength gained during the preseason, decayed in-season, whereas UB strength increased moderately (∼10 ± 3%) across the season. Power showed inconsistencies between measured variables with a moderate positive change across the season in mean velocity and relative peak power. Forwards showed a small decrease in peak power (relative and absolute). Moderate changes were observed in mean power over the season, forwards decreasing (∼6 ± 6%) and backs increasing (∼8 ± 6%). Rugby sevens forwards in this study found it difficult to maintain and improve power qualities in-season. Training loads of forwards and backs should be differentiated to maximize strength and power in-season.

    AB - This study determined whether body composition, strength, and power changes that occur during preseason can be maintained during an international rugby sevens season. Fourteen male international rugby sevens players (age 21.4 ± 2.2 years; mean ± SD) were categorized as forward (n = 7) or back (n = 7), and assessed for height, mass (M), skinfolds (S) (∑7), upper-body (UB) strength, lower-body (LB) strength, and LB power. Bench press, back squat, and a countermovement jump were used to measure strength and power at 3 time points: initial, early season, and late season. Forwards were taller (185 ± 4 cm), heavier (95 ± 6 kg), and possessed a greater lean body mass (55.5 ± 4.0 M·S) than backs (181 ± 8 cm, 88.5 ± 5.5 kg, and 51.9 ± 3.4 M·S). Over the full season, small (∼5 ± 5%; mean ± 90% confidence limits) positive changes occurred in body composition. Lower-body strength gained during the preseason, decayed in-season, whereas UB strength increased moderately (∼10 ± 3%) across the season. Power showed inconsistencies between measured variables with a moderate positive change across the season in mean velocity and relative peak power. Forwards showed a small decrease in peak power (relative and absolute). Moderate changes were observed in mean power over the season, forwards decreasing (∼6 ± 6%) and backs increasing (∼8 ± 6%). Rugby sevens forwards in this study found it difficult to maintain and improve power qualities in-season. Training loads of forwards and backs should be differentiated to maximize strength and power in-season.

    KW - Athletic Performance

    KW - Body Composition

    KW - Football

    KW - Humans

    KW - Lower Extremity

    KW - Male

    KW - Muscle Strength

    KW - Young Adult

    KW - Journal Article

    U2 - 10.1519/JSC.0000000000001188

    DO - 10.1519/JSC.0000000000001188

    M3 - Article

    VL - 30

    SP - 1127

    EP - 1136

    JO - Journal of Strength and Conditioning Research

    JF - Journal of Strength and Conditioning Research

    SN - 1064-8011

    IS - 4

    ER -