Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males

Kosuke Hirata; Mari Ito; Yuta Nomura; Chiho Kawashima; Yuma Tsuchiya; Kosuke Ooba; Tsukasa Yoshida; Yosuke Yamada; Geoffrey A Power; Neale A Tillin; Ryota Akagi

doi:10.1007/s00421-022-05005-2

Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males

Kosuke Hirata, Mari Ito, Yuta Nomura, Chiho Kawashima, Yuma Tsuchiya, Kosuke Ooba, Tsukasa Yoshida, Yosuke Yamada, Geoffrey A Power, Neale A Tillin, Ryota Akagi

School of Life and Health Sciences

Research output: Contribution to journal › Article › peer-review

Abstract

The purpose of this study was to investigate associations of muscle quality indices with joint-level power-related measures in the knee extensors of thirty-two older males (65-88 years). Muscle quality indices included: echo intensity, ratio of intracellular- to total water content (ICW/TW), and specific muscle strength. Echo intensity was acquired from the rectus femoris (EI ) and vastus lateralis (EI ) by ultrasonography. ICW/TW was computed from electrical resistance of the right thigh obtained by bioelectrical impedance spectroscopy. Specific muscle strength was determined as the normalized maximal voluntary isometric knee extension (MVIC) torque to estimated knee extensor volume. Isotonic maximal effort knee extensions with a load set to 20% MVIC torque were performed to obtain the knee extension power-related measures (peak power, rate of power development [RPD], and rate of velocity development [RVD]). Power and RPD were normalized to MVIC. There were no significant correlations between muscle quality indices except between EI and EI (|r|≤ 0.253, P ≥ 0.162). EI was negatively correlated with normalized RPD and RVD (r ≤ - 0.361, P ≤ 0.050). ICW/TW was positively correlated with normalized peak power (r = 0.421, P = 0.020). Specific muscle strength was positively correlated with absolute peak power and RPD (r ≥ 0.452, P ≤ 0.012). Knee extension power-related measures were lower in participants with higher EI, lower ICW/TW, and lower specific muscle strength, but the muscle quality indices may be determined by independent physiological characteristics. [Abstract copyright: © 2022. The Author(s).]

Original language	English
Pages (from-to)	10.1007/s00421-022-05005-2
Journal	EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Early online date	18 Jul 2022
DOIs	https://doi.org/10.1007/s00421-022-05005-2
Publication status	E-pub ahead of print - 18 Jul 2022

Keywords

Rate of velocity development
Specific muscle strength
Intracellular water
Bioelectrical impedance spectroscopy
Echo intensity
Rate of power development

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10.1007/s00421-022-05005-2Licence: CC BY-ND

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Cite this

Hirata, K., Ito, M., Nomura, Y., Kawashima, C., Tsuchiya, Y., Ooba, K., Yoshida, T., Yamada, Y., Power, G. A., Tillin, N. A., & Akagi, R. (2022). Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 10.1007/s00421-022-05005-2. Advance online publication. https://doi.org/10.1007/s00421-022-05005-2

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abstract = "The purpose of this study was to investigate associations of muscle quality indices with joint-level power-related measures in the knee extensors of thirty-two older males (65-88 years). Muscle quality indices included: echo intensity, ratio of intracellular- to total water content (ICW/TW), and specific muscle strength. Echo intensity was acquired from the rectus femoris (EI ) and vastus lateralis (EI ) by ultrasonography. ICW/TW was computed from electrical resistance of the right thigh obtained by bioelectrical impedance spectroscopy. Specific muscle strength was determined as the normalized maximal voluntary isometric knee extension (MVIC) torque to estimated knee extensor volume. Isotonic maximal effort knee extensions with a load set to 20% MVIC torque were performed to obtain the knee extension power-related measures (peak power, rate of power development [RPD], and rate of velocity development [RVD]). Power and RPD were normalized to MVIC. There were no significant correlations between muscle quality indices except between EI and EI (|r|≤ 0.253, P ≥ 0.162). EI was negatively correlated with normalized RPD and RVD (r ≤ - 0.361, P ≤ 0.050). ICW/TW was positively correlated with normalized peak power (r = 0.421, P = 0.020). Specific muscle strength was positively correlated with absolute peak power and RPD (r ≥ 0.452, P ≤ 0.012). Knee extension power-related measures were lower in participants with higher EI, lower ICW/TW, and lower specific muscle strength, but the muscle quality indices may be determined by independent physiological characteristics. [Abstract copyright: {\textcopyright} 2022. The Author(s).]",

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author = "Kosuke Hirata and Mari Ito and Yuta Nomura and Chiho Kawashima and Yuma Tsuchiya and Kosuke Ooba and Tsukasa Yoshida and Yosuke Yamada and Power, {Geoffrey A} and Tillin, {Neale A} and Ryota Akagi",

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doi = "10.1007/s00421-022-05005-2",

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T1 - Muscle quality indices separately associate with joint-level power-related measures of the knee extensors in older males

AU - Hirata, Kosuke

AU - Ito, Mari

AU - Nomura, Yuta

AU - Kawashima, Chiho

AU - Tsuchiya, Yuma

AU - Ooba, Kosuke

AU - Yoshida, Tsukasa

AU - Yamada, Yosuke

AU - Power, Geoffrey A

AU - Tillin, Neale A

AU - Akagi, Ryota

PY - 2022/7/18

Y1 - 2022/7/18

N2 - The purpose of this study was to investigate associations of muscle quality indices with joint-level power-related measures in the knee extensors of thirty-two older males (65-88 years). Muscle quality indices included: echo intensity, ratio of intracellular- to total water content (ICW/TW), and specific muscle strength. Echo intensity was acquired from the rectus femoris (EI ) and vastus lateralis (EI ) by ultrasonography. ICW/TW was computed from electrical resistance of the right thigh obtained by bioelectrical impedance spectroscopy. Specific muscle strength was determined as the normalized maximal voluntary isometric knee extension (MVIC) torque to estimated knee extensor volume. Isotonic maximal effort knee extensions with a load set to 20% MVIC torque were performed to obtain the knee extension power-related measures (peak power, rate of power development [RPD], and rate of velocity development [RVD]). Power and RPD were normalized to MVIC. There were no significant correlations between muscle quality indices except between EI and EI (|r|≤ 0.253, P ≥ 0.162). EI was negatively correlated with normalized RPD and RVD (r ≤ - 0.361, P ≤ 0.050). ICW/TW was positively correlated with normalized peak power (r = 0.421, P = 0.020). Specific muscle strength was positively correlated with absolute peak power and RPD (r ≥ 0.452, P ≤ 0.012). Knee extension power-related measures were lower in participants with higher EI, lower ICW/TW, and lower specific muscle strength, but the muscle quality indices may be determined by independent physiological characteristics. [Abstract copyright: © 2022. The Author(s).]

AB - The purpose of this study was to investigate associations of muscle quality indices with joint-level power-related measures in the knee extensors of thirty-two older males (65-88 years). Muscle quality indices included: echo intensity, ratio of intracellular- to total water content (ICW/TW), and specific muscle strength. Echo intensity was acquired from the rectus femoris (EI ) and vastus lateralis (EI ) by ultrasonography. ICW/TW was computed from electrical resistance of the right thigh obtained by bioelectrical impedance spectroscopy. Specific muscle strength was determined as the normalized maximal voluntary isometric knee extension (MVIC) torque to estimated knee extensor volume. Isotonic maximal effort knee extensions with a load set to 20% MVIC torque were performed to obtain the knee extension power-related measures (peak power, rate of power development [RPD], and rate of velocity development [RVD]). Power and RPD were normalized to MVIC. There were no significant correlations between muscle quality indices except between EI and EI (|r|≤ 0.253, P ≥ 0.162). EI was negatively correlated with normalized RPD and RVD (r ≤ - 0.361, P ≤ 0.050). ICW/TW was positively correlated with normalized peak power (r = 0.421, P = 0.020). Specific muscle strength was positively correlated with absolute peak power and RPD (r ≥ 0.452, P ≤ 0.012). Knee extension power-related measures were lower in participants with higher EI, lower ICW/TW, and lower specific muscle strength, but the muscle quality indices may be determined by independent physiological characteristics. [Abstract copyright: © 2022. The Author(s).]

KW - Rate of velocity development

KW - Specific muscle strength

KW - Intracellular water

KW - Bioelectrical impedance spectroscopy

KW - Echo intensity

KW - Rate of power development

U2 - 10.1007/s00421-022-05005-2

DO - 10.1007/s00421-022-05005-2

M3 - Article

C2 - 35849183

SN - 1439-6319

SP - 10.1007/s00421-022-05005-2

JO - EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY

JF - EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY

ER -