Force Steadiness in the Lower Extremities as an Independent Predictor of Functional Performance in Older Women

Seynnes, Olivier; Hüe, Olivier; Garrandes, Frédéric; Colson, Serge S.; Bernard, Pierre Louis; Legros, Patrick; Singh, Maria A. Fiatarone

doi:10.1123/japa.13.4.395

Cited by 66 publications

(65 citation statements)

References 32 publications

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“…Further, how torque steadiness and accuracy relate to specific functional task performance awaits further research. Although research relating torque steadiness and accuracy to function is very limited, Seynnes et al [3] report knee extension isometric torque steadiness is significantly related to chair-rise time and stair-climbing power in older women with mild functional impairment, and torque steadiness accounts for 63% and 34% of the variance in these variables, respectively. Thus, since hip muscle function is crucial for many types of activities of daily living, it appears likely torque steadiness in the hip musculature may also be related to performance of functional tasks.…”

Section: Torque Steadinessmentioning

confidence: 99%

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Age and Gender Differences in Hip Extension and Flexion Torque Steadiness

Grunte¹,

Hunter²,

McCurry

et al. 2010

Gerontology

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Background: Lower extremity torque steadiness has been shown to be an independent predictor of functional performance in older women. Hip muscle function is crucial for many types of activities of daily living, yet existing studies investigating torque steadiness for lower extremities are limited to assessing steadiness at the knee and ankle. Objective: The purpose of this study was to compare age and gender differences in hip extension (HE) and flexion (HF) strength, torque steadiness, and torque accuracy (TA). Methods: Twenty young adults (10 men, 10 women; age 24.0 ± 2.2 years) and 21 older adults (11 men, 10 women; age 65.4 ± 4.5 years) matched across age for height and body mass participated. Dominant leg HE and HF isometric strength was assessed by maximal voluntary contractions (MVC); relative (5, 25 and 50% MVC) and absolute (25 Nm) torque steadiness were assessed as standard deviation and coefficient of variation of torque fluctuations, and TA was determined as the mean deviation from target torque levels. Results: MVC was lower for HF than HE (p = 0.007), but HE had greater torque fluctuations (p < 0.05). For HE, the coefficient of variation of 5% MVC was greater for older than young adults (p < 0.05) and greater for women than men (p < 0.05). For HF torque steadiness there were no age or gender differences (p > 0.05). For both HE and HF, older adults were less accurate (higher TA) than their young counterparts at 25 Nm (p < 0.022). Conclusions: Our results indicate older as compared to young adults, and women as compared to men are less steady (greater torque fluctuations) in HE at 5% MVC target torque levels, but not at higher torque levels. For HF, torque steadiness is similar across low to high target torque levels in both genders and across younger and older adults. For both HE and HF, TA is impaired in older compared to young adults at absolute target torque levels, but not at relative torque levels.

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Section: Torque Steadinessmentioning

confidence: 99%

“…of muscle function that has been implicated as an important component for maintaining balance and functional performance [3] . Previous investigations have compared torque steadiness of young and older adults for the first dorsal interosseus [4,5] , elbow flexors [6,7] , knee extensors [8,9] , and ankle plantar and dorsiflexor muscles [10,11] .…”

mentioning

confidence: 99%

Age and Gender Differences in Hip Extension and Flexion Torque Steadiness

Grunte¹,

Hunter²,

McCurry

et al. 2010

Gerontology

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show abstract

“…Before the walk, participants produced 3 maximal voluntary isometric contractions of 3-5 seconds each with 3-min recovery between each effort (Seynnes et al, 2005 …”

Section: Maximal Voluntary Isometric Force (Mvif) Of Knee Extensorsmentioning

confidence: 99%

Eccentric contraction-induced muscle injury does not change walking economy in older adults

Gault

Clements

Willems

2011

Journal of Human Kinetics

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“…19 Force steadiness has been measured for a number of different tasks, as well as muscles to assess the quality of force production in the geriatric population. 11,20,41,47 Better quadriceps force steadiness is believed to be an indicator of more optimal neuromuscular function, leading to improved ability to control and coordinate knee joint movement and forces. 45,54 Dynamic stability of the knee joint depends on load-sharing characteristics of many passive soft tissues, as well as on the control of muscle forces.…”

mentioning

confidence: 99%