Maximum Power During Vertical Jump and Isometric Knee Extension Torque Alter Mobility Performance: A Cross-Sectional Study of Healthy Individuals.
OBJECTIVE
To provide reference values of muscle function (MF) and mobility performance (MP) and to clarify the effects of MF on MP.


METHODS
A normative cross-sectional study.


METHODS
An urban area of Niigata, Japan.


METHODS
A total of 401 individuals (210 men and 191 women) with a mean age of 41.8 years (range, 7-79 years) who lived in the community and did not have impairments in activities of daily living.


METHODS
Grip strength, isometric knee extension torque (IKET), and maximum ground reaction force (Fmax) and maximum power (Pmax) during a vertical jump were used as measurements of MF. The chair-rise test (CRT) and the timed "Up and Go" test (TUG) were used to assess MP.


METHODS
Mean values of GS, IKET, CRT, TUG, Fmax, and Pmax were calculated according to age and gender. A stepwise multiple regression analysis was used to identify MF factors with an effect on CRT and TUG in participants ≥20 years of age.


RESULTS
Our results showed that all MF parameters were decreased in individuals ≥20 years of age compared to those <20 years old. Moreover, all of the MP parameters increasingly deteriorated with increasing age. CRT and TUG were affected by Pmax and IKET in men and by IKET in women according to logistic regression analysis.


CONCLUSIONS
The study findings suggest that muscle power affects MP more than the muscle strength in persons aged ≥20 years.
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata-shi, Niigata, Japan; Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan(∗). Electronic address: tsubaki@nuhw.ac.jp.
Atsuhiro
A
Tsubaki
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan; Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan(†).
Masayoshi
M
Kubo
Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan(‡).
Ryosaku
R
Kobayashi
Department of Physical Therapy, Tokyo University of Technology, Tokyo, Japan(§).
Hirofumi
H
Jigami
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan; Department of Physical Therapy, Niigata University of Health and Welfare, Niigata, Japan(‖).
Kazuhiro
K
Sugawara
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan(¶).
Hideaki E
HE
Takahashi
D000203:Activities of Daily Living; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003430:Cross-Sectional Studies; D015444:Exercise / Q000502:physiology*; D005260:Female; D064368:Healthy Volunteers; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology*; D007719:Knee Joint / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D053580:Muscle Strength / Q000502:physiology*; D019415:Torque; D055815:Young Adult