Muscle quality and relative adiposity are the strongest predictors of lower-extremity physical function in older women

Straight, Chad R.; Brady, Anne O.; Evans, Ellen M.

doi:10.1016/j.maturitas.2014.10.006

Cited by 26 publications

(39 citation statements)

References 28 publications

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“…Conversely, the leg extensor power rig provides an accessible and functionally relevant isolated assessment of lower body muscular power in a single explosive movement (Bassey et al, 1990). The leg extensor power rig can predict physical function in older adults (Straight et al, 2015a;Straight et al, 2015b), identify differences between young and older adults, fallers and nonfallers (Perry, Carville, Smith, Rutherford, & Newham, 2007) and detect training 18 induced improvements (Capodaglio et al, 2005;Caserotti, Aagaard, Buttrup Larsen, & Puggaard, 2008). The leg extensor power rig is also an important tool in the evaluation of pre-surgical exercise interventions with functional performance becoming an increasingly important variable of interest for clinicians (Jensen, Laustsen, Jensen, Borre, & Petersen, 2016).…”

Section: Discussionmentioning

confidence: 99%

“…This equipment provides a functional method for the assessment of leg extensor power (Bassey & Short, 1990;Bassey et al, 1992) employing similar muscle groups and joint angles to those used in activities such as stair climbing and rising from a chair (Bassey & Short, 1990). Lower-body muscle power measured using the leg extensor power 5 rig has been shown to be a predictor of physical function in older adults (Straight, Brady, & Evans, 2015a;Straight, Brady & Evans, 2015b), while the non-impact nature of the movement and simplicity of the test itself make it an appealing measurement tool.…”

Section: Introductionmentioning

confidence: 99%

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Short- and long-term reliability of leg extensor power measurement in middle-aged and older adults

Hurst

Batterham

Weston

et al. 2017

Journal of Sports Sciences

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Muscular power is important for maintaining physical functioning with aging. Proper quantification of the reliability of muscular power tests is crucial to inform monitoring of individuals and sample size planning for interventional studies. This study evaluated short- and long-term reliability of leg extensor power measurement in 72 adults (age 62.7 ± 8.6 years). Participants completed four repeat trials on the Nottingham leg extensor power rig, with a further trial twelve weeks later. Mean change, typical error, and intraclass correlation coefficients (ICC) were calculated. For short-term reliability, mean change in power output was trivial after two trials (1.2-4.8%). Typical errors were small following four trials in the dominant leg of males (10.9-5.8%), three in the non-dominant leg of males (9.9-6.2%) and the dominant leg of females (10.0-9.6%) and two in the non-dominant leg in females (8.3%). Intraclass correlation coefficients (ICCs) were very high (0.88-0.96). For long-term reliability, mean change remained trivial (1.0-2.5%), typical errors remained small (5.8-8.6%), and ICCs very high (0.94-0.96). The leg extensor power rig is a reliable method for assessing lower body muscular power, both short- and long-term, with only minimal habituation effects.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short- and long-term reliability of leg extensor power measurement in middle-aged and older adults

Hurst

Batterham

Weston

et al. 2017

Journal of Sports Sciences

View full text Add to dashboard Cite

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“…23 The composite sum of the Z-scores of each of the two test parameters (average 400 m walk speed and number of stands in the 30-seconds chair test) was calculated to provide a global index for LEF, which was used in the subsequent statistical analyses. 16,25…”

Section: Lower Extremity Functionmentioning

confidence: 99%

Influence of between‐limb asymmetry in muscle mass, strength, and power on functional capacity in healthy older adults

Mertz

Reitelseder

Jensen

et al. 2019

Scandinavian Med Sci Sports

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Purpose Numerous daily tasks such as walking and rising from a chair involve bilateral lower limb movements. During such tasks, lower extremity function (LEF) may be compromised among older adults. LEF may be further impaired due to high degrees of between‐limb asymmetry. The present study investigated the prevalence of between‐limb asymmetry in muscle mass, strength, and power in a cohort of healthy older adults and examined the influence of between‐limb asymmetry on LEF. Methods Two hundred and eight healthy older adults (mean age 70.2 ± 3.9 years) were tested for LEF (400 m walking and 30‐seconds chair stand). Furthermore, maximal isometric and dynamic knee extensor strength, leg extensor power, and lower limb lean tissue mass (LTM) were obtained unilaterally. Results Mean between‐limb asymmetry in maximal muscle strength and power ranged between 10% and 13%, whereas LTM asymmetry was 3 ± 2.3%. Asymmetry in dynamic knee extensor strength was larger for women compared with men (15.0 ± 11.8% vs 11.1 ± 9.5%; P = .005) Leg strength and power were positively correlated with LEF (r2 = .43‐.46, P < .001). The weakest leg was not a stronger predictor of LEF than the strongest leg. Between‐limb asymmetry in LTM and isometric strength was negatively associated with LEF (LTM; r2 = .12, P = .005, isometric peak torque; r2 = 0.40, P = .03.) but dynamic strength and power were not. Conclusion The present study supports the notion that in order to improve or maintain LEF, healthy older adults should participate in training interventions that increase muscle strength and power, whereas the effects of reducing between‐limb asymmetry in these parameters might be of less importance.

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“…resultado que coincidió con los reportados en otros estudios que utilizaron la prueba de 6-min (C. R. Straight, et al, 2014;C. R. Straight, et al, 2015).…”

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“…Con respecto a la relación entre el 2-min y las diferentes manifestaciones de la fuerza de miembros inferiores, se encontraron correlaciones positivas con todas las pruebas de fuerza y potencia muscular en ambos sexos, con excepción de la PMEP al 70% y 80% de 1-RM en los hombres. Este resultado difiere un poco del estudio de Ward-Ritacco, et al que igualmente calcularon la CM con la fuerza y la potencia muscular de miembros inferiores, combinada con la masa muscular de piernas y la relacionaron con el rendimiento de la prueba de 6-min (Vilaca, et al, 2013;Ward-Ritacco, et al, 2014;C. R. Straight, et al, 2015).…”

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Relación entre la masa muscular, la densidad mineral ósea, la fuerza muscular, la aptitud funcional y la calidad muscular en personas mayores = Relationship between muscle mass, bone mineral density, muscle strength, functional fitness and muscle quality in older people

Villada¹,

Alonso²

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RELATIONSHIP BETWEEN MUSCLE MASS, BONE MINERAL DENSITY, MUSCLE STRENGTH, FUNCTIONAL FITNESS AND MUSCLE QUALITY IN OLDER PEOPLE Introduction: As part of the aging process, older people show a progressive decrease in bone mineral density (BMD), muscle mass, muscle strength and functional fitness. But when this decline exceeds normal levels, two well-known problems that affect the health of older people arise: sarcopenia and osteoporosis. Objective: The aim of this study was to determine the frequency of sarcopenia and osteoporosis in a group of older people from León, Spain. In addition, this study explored the association between muscle mass, BMD, muscle strength, functional fitness and muscle quality (MQ). Materials and Methods: A cross-sectional study was carried out on 83 men and 175 women (mean age 70.9 SD 5.5 years and 71.5 SD 5.2 years, respectively). Lean mass (LM) (total, arms, legs, thighs and appendicular), femur neck BMD (FNBMD) and lumbar spine BMD (LSBMD) were assessed by dual-energy X-ray absorptiometry. The isometric maximum strength of leg extension (IMSLE) and biceps curl were assessed by a load cell. The dynamic maximum strength of biceps curl (DMSBC) and leg extension were measured by one-repetition maximun (1-RM). The mean power measures of leg extension (MPLE) at 40%, 50%, 60%, 70% and 80% 1-RM were assessed with a linear motion transducer. The hand grip strength (HGS) was measured with a Jamar dynamometer. The functional fitness was assessed according to four tests taken from the Senior Fitness Test: Arm curl, Chair stand, Step-in-place, and 8 foot up-and-go (8f-UG). The MQ was defined by dividing each test of muscle strength by the specific muscle mass of upper and lower limbs. The osteoporosis of femur neck (OPFN) and the osteoporosis of lumbar spine XXIV (OPLS) were determined by the T-score of the FNBMD and LSBMD, respectively (<-2.5). The sarcopenia was determined according to the definition of the EWGSOP with the following criteria: appendicular lean mass index (ALMI), HGS and 8F-UG. 643316135 Results: The frequency of sarcopenia was 2.3%, while the OPFN was 11.6% and the OPLS was 22.5%; this last was higher in the women (p = 0.001). Most measurements of LM were correlated with muscle strength of arms and legs; however, in the linear regression analysis after adjustment for age and BMI, the ALMI did not behave as an explanatory variable of HGS in both sexes (important criteria used in the evaluation of sarcopenia). Moreover, the ALMI showed better associations with other tests of strength, especially with the MPLE evaluated up to 70% of 1-RM in women and up to 80% of 1-RM in men. Low performance on each test of SFT battery did not show major associations with the indicators of LM; while the tests of muscle strength and MQ showed higher significant differences in both sexes (p <0.05). The measurements of LM were positively correlated with LSBMD in women and FNBMD in both sexes (p <0.01); with respect to muscle strength, important positive correlations were presented in men between the FN...

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Muscle quality and relative adiposity are the strongest predictors of lower-extremity physical function in older women

Cited by 26 publications

References 28 publications

Short- and long-term reliability of leg extensor power measurement in middle-aged and older adults

Short- and long-term reliability of leg extensor power measurement in middle-aged and older adults

Influence of between‐limb asymmetry in muscle mass, strength, and power on functional capacity in healthy older adults

Relación entre la masa muscular, la densidad mineral ósea, la fuerza muscular, la aptitud funcional y la calidad muscular en personas mayores = Relationship between muscle mass, bone mineral density, muscle strength, functional fitness and muscle quality in older people

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