Power output of the lower limb during variable inertial loading: a comparison between methods using single and repeated contractions

Pearson, Stephen; Cobbold, M; Harridge, Sdr

doi:10.1007/s00421-004-1046-0

Cited by 19 publications

(16 citation statements)

References 16 publications

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“…The linear appearance of the force-velocity relation of the knee-hip extension movement was consistent with other studies on half squat (Bosco et al, 1995;Rahmani et al, 2001), leg press (Macaluso and De Vito, 2003;Pearson et al, 2004), leg cycling (Driss et al, 1998(Driss et al, , 2002Vandewalle et al, 1987;Yamauchi et al, 2005), and arm cranking (Driss et al, 1998) exercises. Therefore, the maximum isometric force (F max ) and the maximum unloaded velocity (V max ) could be estimated by extrapolating the linear regressions.…”

Section: Article In Presssupporting

confidence: 85%

“…It has been reported that a maximum elbow flexion power is produced when the load is about one-third of the maximum isometric force and increased after the training with about one-third of the maximum isometric force (Kaneko et al, 1983;Toji et al, 1997). However, for knee-hip extension movements, our study and others (Macaluso and De Vito, 2003;Pearson et al, 2004) demonstrated that the maximum mechanical power was generated under $50% of the maximum isometric force. Therefore, different exercise intensities may have to be used in single-joint and multi-joint movements for optimizing the development of power.…”

Section: Article In Presscontrasting

confidence: 70%

“…This wide range of force makes it possible to evaluate appropriately human muscular function in vivo when compared with other existing methods, since it has been reported that isokinetic measurements are difficult to attain a high velocity close to V max (Froese and Houston, 1985;James et al, 1994;Prietto and Caiozzo, 1989;Perrine and Edgerton, 1978;Wickiewicz et al, 1984). Also, other studies in the knee-hip extension movements (Bosco et al, 1995;Macaluso and De Vito, 2003;Pearson et al, 2004;Rahmani et al, 2001) have measured force and velocity over limited range of velocity, so that the shape of force-velocity curve at high or low velocity regions has not been well understood. It has been reported that, in single fibers, maximum velocity estimated by extrapolation will be much closer to its true value when measurements will be made for force closer to zero (Julian et al, 1986).…”

Section: Discussionmentioning

confidence: 96%

“…The muscle function during multi-joint movements has not been extensively studied because of their complexity. So far, studies on the force-velocity relation have been reported for some multi-joint movements, such as half-squat (Bosco et al, 1995;Rahmani et al, 2001), leg press (Macaluso and De Vito, 2003;Pearson et al, 2004) and leg or arm cranking (Driss et al, 1998;Vandewalle et al, 1987) exercises. However, interpreting the shape of the force-velocity relation determined in these studies needs caution, because the forces were not controlled throughout the movements.…”

Section: Introductionmentioning

confidence: 98%

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Steady-state force–velocity relation in human multi-joint movement determined with force clamp analysis

Yamauchi

Mishima

Fujiwara

et al. 2007

Journal of Biomechanics

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Section: Article In Presssupporting

confidence: 85%

Section: Article In Presscontrasting

confidence: 70%

Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Steady-state force–velocity relation in human multi-joint movement determined with force clamp analysis

Yamauchi

Mishima

Fujiwara

et al. 2007

Journal of Biomechanics

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“…Calculation of PP was performed similarly to that as detailed by Pearson et al . (). The inertial load of the system was set at 0.325 kg m 2 .…”

Section: Methodsmentioning

confidence: 97%

An investigation into the relationship between age and physiological function in highly active older adults

Pollock

Carter

Velloso

et al. 2015

The Journal of Physiology

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Key Pointsr The relationship between age and physiological function remains poorly defined and there are no physiological markers that can be used to reliably predict the age of an individual.r This could be due to a variety of confounding genetic and lifestyle factors, and in particular to ill-defined and low levels of physical activity.r This study assessed the relationship between age and a diverse range of physiological functions in a cohort of highly active older individuals (cyclists) aged 55-79 years in whom the effects of lifestyle factors would be ameliorated.r Significant associations between age and function were observed for many functions.V O 2 max was most closely associated with age, but even here the variance in age for any given level was high, precluding the clear identification of the age of any individual.r The data suggest that the relationship between human ageing and physiological function is highly individualistic and modified by inactivity.Abstract Despite extensive research, the relationship between age and physiological function remains poorly characterised and there are currently no reliable markers of human ageing. This is probably due to a number of confounding factors, particularly in studies of a cross-sectional nature. These include inter-subject genetic variation, as well as inter-generational differences in nutrition, healthcare and insufficient levels of physical activity as well as other environmental factors. We have studied a cohort of highly and homogeneously active older male (n = 84) and female (n = 41) cyclists aged 55-79 years who it is proposed represent a model for the study of human ageing free from the majority of confounding factors, especially inactivity. The aim of the study was to identify physiological markers of ageing by assessing the relationship between function and age across a wide range of indices. Each participant underwent a detailed physiological profiling which included measures of cardiovascular, respiratory, neuromuscular, metabolic, endocrine and cognitive functions, bone strength, and health and well-being. Significant associations between age and function were observed for many functions. The maximal rate of oxygen consumption (V O 2 max ) showed the closest association with age (r = −0.443 to −0.664; P < 0.001), but even here the variance in age for any given level was high, precluding the clear identification of the age of any individual. The results of this cross-sectional study suggest that even when many confounding variables are removed the relationship between function and healthy ageing is complex and likely to be highly individualistic and that physical activity levels must be taken into account in ageing studies.

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Quadriceps weakness preferentially predicts detrimental gait compensations among common impairments after total knee arthroplasty

Christensen

Mizner

Foreman

et al. 2018

Journal Orthopaedic Research

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Patients with total knee arthroplasty (TKA) have large deficits in physical performance in comparison to their healthy age-matched peers. Limb asymmetry stemming from less relative load borne by the surgical limb during daily mobility is associated with diminished performance and worsens with greater mobility demands. How common targets of postoperative care, such as muscle weakness, lower limb extension power, residual knee pain, and poor balance confidence can influence asymmetrical limb loading remains unclear. Forty-six patients with unilateral TKA underwent testing of impairments and motion analysis during 10° decline walking at 3 and 6 months postoperatively. At 3 months, only quadriceps femoris strength asymmetry was found to be significantly related to both total support moment (M ) (β = 0.431; p < 0.001) and knee extensor moment (M ) (β = 0.493; p < 0.001) asymmetry. Again at 6 months, only quadriceps strength asymmetry was related to M (β = 0.432; p < 0.001) and M (β = 0.534; p < 0.001) asymmetry. Quadriceps strength significantly improved over time in both limbs, however, deficits between limbs remained. Persistent quadriceps weakness is a key factor associated with walking compensation patterns that are limiting the capacity for greater physical performance of patients with TKA. The pronounced asymmetry in limb and knee loading at 3 months remains unchanged until at least 6 months after surgery, and its association with quadriceps strength asymmetry does not substantially change over time. While other factors may also prompt gait compensations, emphasis on improved quadriceps strength should be a focus of efforts to resolve gait compensations and enhance physical performance outcomes. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:2355-2363, 2018.

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Power output of the lower limb during variable inertial loading: a comparison between methods using single and repeated contractions

Cited by 19 publications

References 16 publications

Steady-state force–velocity relation in human multi-joint movement determined with force clamp analysis

Steady-state force–velocity relation in human multi-joint movement determined with force clamp analysis

An investigation into the relationship between age and physiological function in highly active older adults

Quadriceps weakness preferentially predicts detrimental gait compensations among common impairments after total knee arthroplasty

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