Age Differences in Noise and Variability of Isometric Force Production

Deutsch, Katherine M.; Newell, Karl M.

doi:10.1006/jecp.2001.2642

Cited by 81 publications

(75 citation statements)

References 9 publications

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“…these findings agree with those of previous studies 26,30 , which also reported less precision at higher strength levels. RmS error, used as a precision measure, reflected the subject's difficulty in reaching the target which, in this case, meant reaching the relative torque level required and keeping it constant and continuos.…”

Section: Discussionsupporting

confidence: 93%

“…However, when participants were asked to control torque at different submaximum levels, there was greater motor response variability. these results concur with findings of previous studies for tasks involving finger-pressure strength control 26 , two-fingered prehension in pinch 14 and torque in lateral pinch 4,19 .…”

Section: Discussionsupporting

confidence: 93%

“…this analysis offered information on the sensory and motor system's ability to adjust itself and explore the control possibilities of the motor system 27,28 . the results for the present study showed the effect of irregularity on assessed submaximum torque levels and converged with the findings of previous studies 18,26,28,29 . there was an increase in irregularity until the maximum point (40%), when there was a decrease to smaller values of approximate entropy.…”

Section: Discussionsupporting

confidence: 92%

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Efeito da posição da articulação do cotovelo no controle de torque de supinação do antebraço em jovens adultos

Borges¹,

Rodrigues²,

Loss³

et al. 2007

Rev. bras. fisioter.

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Background: large numbers of cases of pathological conditions in the forearm and elbow that have been reported in the literature are associated with tasks involving effort and repetitive movements of the arms and hands. Elbow position is known to affect the production of maximum forearm supination torque, and is a critical factor in designing appropriate therapeutic exercises. However, to our knowledge, there are no data on the effects of elbow position on tasks requiring control over submaximal torque levels. objective: this study investigated the effects of elbow position on the production of maximum isometric forearm supination torque, and on constant and continuous torque control at different submaximal torque levels. method: Sixteen young adults (24.7 ± 2.2 years old) were asked to perform two tasks: production of maximum lateral pinch torque (thumb and index finger) and controlled lateral pinch constant torque. Both tasks were evaluated at four different elbow positions (free position, 0°, 45° and 90° of elbow flexion) and three submaximal levels of lateral pinch torque production (20%, 40% and 60%). maximal torque, variability, irregularity and accuracy of the motor response were used as dependent variables. Results: greater torque values were found when the elbow joint was not restricted. the torque control tasks were not affected by the elbow position. However, greater variability and irregularity and lower accuracy in torque response were recorded with progressively increased submaximal torque levels. Conclusion: the results suggest that elbow position is not a determining factor for rehabilitation exercises that include torque control, in relation to forearm supination.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

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Efeito da posição da articulação do cotovelo no controle de torque de supinação do antebraço em jovens adultos

Borges¹,

Rodrigues²,

Loss³

et al. 2007

Rev. bras. fisioter.

View full text Add to dashboard Cite

show abstract

“…The 1-Hz output of the model is further complicated by recent findings from our laboratory, which show that there is not a modal frequency of force output (Deutsch & Newell, 2001;Mayer-Kress, Deutsch, & Newell, 2003;Mayer-Kress & Newell, 2002). Rather, the force output appears to be a fractal 1/f noise-like process containing both deterministic and stochastic components at multiple time scales (i.e., low and high frequencies).…”

mentioning

confidence: 93%

Intermittent visual information and the multiple time scales of visual motor control of continuous isometric force production

Sosnoff

Newell

2005

Perception & Psychophysics

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In an experiment, we examined the effect of intermittency (from 25.6 Hz to 0.2 Hz) of visual information on continuous isometric force production as a function of force level (5%, 10%, 25%, and 50% of maximal voluntary contraction [MVC]). The amount of force variability decreased and the irregularity of force output increased as a function of increased visual intermittency rate. Vision was found to have an influence on the frequency structure of force output up to 12 Hz, and the 25% MVC force level had more high-frequency modulations with higher rates of visual information. The effective use of intermittent visual information is mediated nonlinearly by force level, and there are multiple time scales of visual control (range, ∼0-12 Hz) that are postulated to be a function of both feedback and feedforward control processes.

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“…Ranganathan, Siemionow, Sabgal, and Yue (2001) examined the effects of aging on hand function and reported that, compared with the young, the elderly were weaker in handgrip and maximum pinch force and were inferior also in ability to maintain a steady submaximal pinch force. Some have suggested that these force control properties are influenced by maturation (Deutsch & Newell, 2001; Ofori et al, 2010), aging of neuromuscular pathways (Galganski, Fuglevand, & Enoka, 1993), and constraints of forceoutput tasks such as the magnitude of muscular force (Sosnoff & Newell, 2008).…”

Section: Introductionmentioning

confidence: 99%

Japanese Women’s Age-related Differences between Controlled Force Exertion Measured by a Computer-generated Sinusoidal Waveform and a Bar Chart Display

Nagasawa

Demura²

2014

AJSSM

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Because developing an accurate method of measuring controlled force exertion is important, this study examined age differences in corresponding relationships between controlled force exertions measured by sinusoidal waveform and bar chart displays. Additionally, the study clarified the judgment score of the controlled force exertion's decrease. Participants were 215 right-handed female adults, aged 20-84, in three age groups: young (n = 64, mean age 24, SD = 2.8 years), middle-aged (n = 91, mean age 43, SD = 8.0 years), and elderly (n = 60, mean age 68, SD = 6.5 years). They matched the submaximal grip strength in their dominant hand to changing demand values displayed on a personal computer screen as either a sinusoidal waveform or a bar chart. They performed the tests three times with 1-minute inter-trial intervals. The dependent variable was the total of percentage values of differences between the demand and grip exertion values for 25 seconds. In both displays, the coefficient of variance had almost the same range in all age groups (CVSW = 25.9-32.0, CVBC = 21.2-38.8), but the elderly group showed a somewhat higher value with the bar chart. Three groups had significant correlations between scores with the sinusoidal waveform and bar chart displays (r = 0.33-0.64), but their values did not differ significantly among age groups. Only 0%-3% of the middle-aged group had scores over 1500%; 23%-33% of the elderly group did. Furthermore, only 15% of the elderly group had scores over 1500% in both displays. There is a moderate relationship between the controlled force exerted in response to the sinusoidal waveform and bar chart displays, and it does not show age differences. In controlled force exertion, scores over 1500% in both displays are considered inferior to scores under 1500%.

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Age Differences in Noise and Variability of Isometric Force Production

Cited by 81 publications

References 9 publications

Efeito da posição da articulação do cotovelo no controle de torque de supinação do antebraço em jovens adultos

Efeito da posição da articulação do cotovelo no controle de torque de supinação do antebraço em jovens adultos

Intermittent visual information and the multiple time scales of visual motor control of continuous isometric force production

Japanese Women’s Age-related Differences between Controlled Force Exertion Measured by a Computer-generated Sinusoidal Waveform and a Bar Chart Display

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