An Inexpensive Method to Measure Knee Extensors' Power in Older Adults

Pinho, João Pedro; Mezêncio, Bruno; Claudino, João Gustavo; Soncin, Rafael; Hernandez, Arnaldo José; Serrão, Júlio Cerca; Amadio, Alberto Carlos

doi:10.1590/1517-869220152106147232

Cited by 3 publications

(6 citation statements)

References 20 publications

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“…The knee extensors peak power was calculated according to Pinho et al 21 For this purpose, the knee extension machine's resistance torque was previously determined based on the machine's geometry (a function of the angular position due to an eccentric cam). The inertial properties of the participant's shank were estimated using Dempster anthropometric model.…”

Section: Methodsmentioning

confidence: 99%

“…The coordinates of these points were used to determine the angular position, velocity and acceleration. Using these data, a biomechanical model 21 estimated the peak power output based on Newton mechanic laws as a function of: the task's kinematic, the machine's resistance torque and the participants' shank's resistance torque. The mechanical work was calculated as the integral of the power curve over time.…”

Section: Methodsmentioning

confidence: 99%

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Moderate Intensity Is a Better Stimulus to Induce Quadripecs Femoris Power in Elderly Adults

Pinho

Mezêncio

Hernandez

et al. 2018

Rev Bras Med Esporte

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Introduction: The best strategy for improving knee extensor power, a major functional capacity indicator in older adults, is power training. Nonetheless, the training intensity required to induce optimal gains is yet to be found. Objective: Our purpose was to compare knee extensor peak power responses between low, moderate, and high intensity load conditions (30%, 50% and 70% of 1RM). Methods: Thirteen sedentary elderly women performed six knee extensions in each load condition, calculating knee extensor mechanical work/power output and knee extension peak angular velocity. Results: No difference in peak power was found between the high (207.0 ± 68.1 W) and moderate (206.1 ± 71.6 W) load conditions (p = 0.994), and both had higher values (p ≤0.004) than the low intensity condition (135.6 ± 56.3 W). Conclusion: Moderate load at 50% of 1RM appears to be the preferred strategy for inducing knee extensor power output because in contrast with the high intensity condition, the moderate load yielded higher angular peak velocity, which is also a functional indicator. Level of Evidence ll; Therapeutic studies -Investigating treatment results.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Moderate Intensity Is a Better Stimulus to Induce Quadripecs Femoris Power in Elderly Adults

Pinho

Mezêncio

Hernandez

et al. 2018

Rev Bras Med Esporte

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“…Dempster's anthropometric model [24] was used to determine the information about the mass, center of mass location and moment of inertia, taking into account anthropometric differences between participants. The reader is guided elsewhere [25] for further information about these power output calculations.…”

Section: Methodsmentioning

confidence: 99%

Relationship Between Knee Extensors Power Output and Vastus Lateralis EMG Activation in Elderly Women: Influence of Mother Wavelet Selection

Pinho¹,

Mezêncio²,

Porras³

et al. 2017

TOSSJ

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Purpose:The main objective of this study was to compare frequency parameters produced by six mother wavelets pinpointing the most feasible to investigate electromyographic (EMG) parameters while producing knee extension power in elderly women. The influence of different load conditions in mother wavelet selection and power output were also analyzed.Methods:Thirteen sedentary elderly women (69.3 ± 4.1 years) took part in the study. Participants executed 6 repetitions of 3 load condition (30%, 50% and 70% of the maximal) with the concentric phase of the knee extension movement as quickly as possible. Kinematic data obtained by video analysis, an anthropometric model and Newtonian mechanics were used to calculate knee extensors’ power. A continuous wavelet analysis was used as a time-frequency transformation strategy of vastus lateralis and biceps femoris EMG data and six different mother wavelets were selected: Morlet; 4th, 8th and 44th order Daubechie, 4th order Coiflet and 5th order Symlet.Results:44th order Daubechie showed the highest maximal cross correlation value and no differences were seen between different mother wavelets and cross correlation at zero lag and in the lag variable. Although increased knee extensors peak power at higher loads were seen, no differences in vastus lateralis or biceps femoris root mean square values were obtained.Conclusion:44th order Daubechie mother wavelet was pinpointed as the most suitable to obtain EMG time-frequency parameters. We have also seen that different load conditions do not seem to have an influence on mother wavelet selection.

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“…6 However, because of the high cost and training involved in isokinetic evaluation, this technique is limited to major centers and hospitals and is not available to all patients. 3,7…”

Section: Introductionmentioning

confidence: 99%

“…6 However, because of the high cost and training involved in isokinetic evaluation, this technique is limited to major centers and hospitals and is not available to all patients. 3,7 The Lysholm score is one of the most frequently used functional questionnaires. This questionnaire allows for evaluation of the functional limitations caused by knee disorders through eight questions, is low-cost and easy to apply, requiring little time to perform.…”

Section: Introductionmentioning

confidence: 99%

Association between Lysholm score and muscular torque deficit after anterior cruciate ligament reconstruction

Andrade

Castro

Livani

et al. 2020

J Orthop Surg (Hong Kong)

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Purpose: The asymmetry of muscular strength after anterior cruciate ligament reconstruction (ACLR) is associated with increase in the development of new lesions. This asymmetry is precisely assessed by isokinetic dynamometry which is a high-cost technique, limited to major centers and hospitals. Thus, the aim of this study was to test the accuracy of one of the most frequently used functional questionnaires, the Lysholm score, to diagnose the knee torque deficit. Methods: In total, 115 patients were evaluated after ACLR. Knee symptoms were evaluated using the Lysholm questionnaire and knee extensor and flexor peak torque during maximal isokinetic concentric contractions at 60° s−1 (5 repetitions) and 180° s−1 (15 repetitions). Patients with <20% peak torque deficit were considered symmetric (normal). Results: An increase in the Lysholm score was associated with a deficit reduction in the peak torque of knee extensors at 60° s−1 ( r = −0.294) and 180° s−1 ( r = −0.297) ( p < 0.05 for both). Cutoff Lysholm scores of >90 points for 60° s−1 allowed the correct diagnosis of symmetry in 71% and of >89 points for 180º·s−1 allowed the correct diagnosis of symmetry in 73%, for knee extensors. Patients with a Lysholm score of >89 points presented an isokinetic deficit 36% lower than patients with a Lysholm score of ≤89 points ( p < 0.05). Conclusion: A Lysholm score of >89 points has predictive value for deficits in the peak torque of knee extension (<20%). However, replacement of the isokinetic evaluation by this instrument must be performed with caution because of its accuracy.

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An Inexpensive Method to Measure Knee Extensors' Power in Older Adults

Cited by 3 publications

References 20 publications

Moderate Intensity Is a Better Stimulus to Induce Quadripecs Femoris Power in Elderly Adults

Moderate Intensity Is a Better Stimulus to Induce Quadripecs Femoris Power in Elderly Adults

Relationship Between Knee Extensors Power Output and Vastus Lateralis EMG Activation in Elderly Women: Influence of Mother Wavelet Selection

Association between Lysholm score and muscular torque deficit after anterior cruciate ligament reconstruction

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