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Dr. Ulloa-Diaz, David
Nombre de publicaciĆ³n
Dr. Ulloa-Diaz, David
Nombre completo
Ulloa Diaz, David Leonardo
Facultad
Email
dulloa@ucsc.cl
ORCID
4 results
Research Outputs
Now showing 1 - 4 of 4
- PublicationA new reliable device to assess trunk extensors strength(Acta of Bioengineering and Biomechanics, 2021)
; ; ;Reyes-Ferrada, Waleska ;Chirosa-RĆos, Luis ;Chirosa-RĆos, Ignacio ;MartĆnez-GarcĆa, DarĆo ;Jerez-Mayorga, DanielRodrĆguez-Perea, ĆngelaPurpose: This study aimed to examine the reliability of trunk extensor strength assessment with a functional electromechanical dynamometer (FEMD). Methods: Thirty-one men performed strength assessment at different velocities (V) (V1 = 0.15 mĀ·sā1, V2 = 0.30 mĀ·sā1, V3 = 0.45 mĀ·sā1) and range of movement (R) (R1 = 25% cm; R2 = 50% cm), and isometric contraction at 90Āŗ. Reliability was obtained through the intraclass correlation coefficient (ICC), typical error (TE), and coefficient of variation (CV). Results: The absolute reliability provided stable repeatability of the average eccentric strength in the V1R1 condition (CV = 9.52%) and the maximum eccentric strength in V1R1 (CV = 9.63%) and V2R2 (CV = 9.66%). The relative reliability of the trunk extensorās average strength was good (ICC = 0.77ā0.83) for concentric and good (ICC = 0.78ā0.85) and moderate (ICC = 0.67ā0.74) for eccentric contraction. Also, good (ICC = 0.77ā0.81) and moderate (ICC = 0.55ā0.74) reliability of the maximum strength were obtained for concentric and eccentric contraction. The most reliable manifestation to evaluate the concentric (CV = 11.33%) and eccentric (CV = 9.52%) strength was the average strength in the V1R1 condition and the maximum strength (CV = 10.29%) to isometric assessment. The average concentric strength in the V2R2 condition (r = 0.69) and the maximum eccentric strength in the V1R1 condition (r = 0.65) were the best related to the maximum isometric strength. Conclusions: FEMD is a highly reliable device to evaluate trunk extensors strength. - PublicationReliability of a standing isokinetic shoulder rotators strength test using a functional electromechanical dynamometer: effects of velocity(PEERJ, 2020)
;Martinez Garcia, Dario ;Rodriguez Perea, Angela ;Barboza, Paola; ;Jerez Mayorga, Daniel ;Chirosa, IgnacioChirosa RĆos, Luis JavierBackground. The evaluation of the force in internal rotation (IR) and external rotation (ER) of the shoulder is commonly used to diagnose possible pathologies or disorders in the glenohumeral joint and to assess patientās status and progression over time. Currently, there is new technology of multiple joint isokinetic dynamometry that allows to evaluate the strength in the human being. The main purpose of this study was to determine the absolute and relative reliability of concentric and eccentric internal and external shoulder rotators with a functional electromechanical dynamometer (FEMD). Methods. Thirty-two male individuals (21.46 Ā± 2.1 years) were examined of concentric and eccentric strength of shoulder internal and external rotation with a FEMD at velocities of 0.3 m sā1 and 0.6 m sā1 . Relative reliability was determined by intraclass correlation coefficients (ICC). Absolute reliability was quantified by standard error of measurement (SEM) and coefficient of variation (CV). Systematic differences across velocities testing circumstances, were analyzed with dependent t tests or repeated measures analysis of variance in case of two or more than two conditions, respectively. Results. Reliability was high to excellent for IR and ER on concentric and eccentric strength measurements, regardless of velocity used (ICC: 0.81ā0.98, CV: 5.12ā8.27% SEM: 4.06ā15.04N). Concentric outcomes were more reliable than eccentric due to the possible familiarization of the population with the different stimuli. Conclusion. All procedures examined showed high to excellent reliability for clinical use. However, a velocity of 0.60 m sā1 should be recommended for asymptomatic male patients because it demands less time for evaluation and patients find it more comfortable. - PublicationReliability of isometric and isokinetic trunk flexor strength using a functional electromechanical dynamometer(PeerJ, 2019)
;Rodriguez-Perea, Angela ;Chirosa RĆos, Luis J. ;Martinez-Garcia, Dario; ;Guede Rojas, Francisco ;Jerez-Mayorga, DanielChirosa Rios, Ignacio J.Aim. To determine the absolute and relative reliability of functional trunk tests, using a functional electromechanical dynamometer to evaluate the isokinetic strength of trunk flexors and to determine the most reliable assessment condition, in order to compare the absolute and relative reliability of mean force and peak force of trunk flexors and to determine which isokinetic condition of evaluation is best related to the maximum isometric. Methods. Test-retest of thirty-seven physically active male student volunteers who performed the different protocols, isometric contraction and the combination of three velocities (V1 = 015 m sā1, V2 = 0.30 m sā1, V3 = 0.45 m sā1) and two range of movement (R1 = 25% cm ; R2 = 50% cm) protocols. Results. All protocols to evaluate trunk flexors showed an absolute reliability provided a stable repeatability for isometric and dynamic protocols with a coefficient of variation (CV) being below 10% and a high or very high relative reliability (0.69 < intraclass correlation coefficient [ICC] > 0.86). The more reliable strength manifestation (CV = 6.82%) to evaluate the concentric contraction of trunk flexors was mean force, with 0.15 m sā1 and short range of movement (V1R1) condition. The most reliable strength manifestation to evaluate the eccentric contraction of trunk flexors was peak force, with 0.15 m sā1 and a large range of movement (V1R2; CV = 5.07%), and the most reliable way to evaluate isometric trunk flexors was by peak force (CV = 7.72%). The mean force of eccentric trunk flexor strength with 0.45 m sā1 and short range of movement (V3R1) condition (r = 0.73) was best related to the maximum isometric contraction. Conclusion. Functional electromechanical dynamometry is a reliable evaluation system for assessment of trunk flexor strength. - PublicationTestāRetest Reliability of an Isometric and Isometric/Vibratory Muscular Strength Protocol with Functional Electro-Mechanical Dynamometry(MDPI, 2024)
;Andrades-RamĆrez, Oscar; ;Alfaro Castillo, Bryan ;Arroyo-JofrĆ©, Patricio ;Castillo-Paredes, AntonioChirosa-RĆos, LuisThe purpose of the study was to analyze the testāretest reliability of an isometric and isometric/vibratory muscular strength protocol in the bilateral seated bench press (BSBP), bilateral seated rowing (BSR), unilateral seated right knee extension (USKER), and left knee extension (USKEL) tests controlled using functional electromechanical dynamometry (FEMD) in healthy young adults. A repeated measures design was used to determine the reliability of a muscular strength protocol in isometric and isometric vibration modes with FEMD. No significant differences were found in testāretest analysis (p > 0.05; ES < 0.20); and high reliability (CV = 4.65ā5.02%; ICC = 0.99ā0.98) was found for BSBP measures, and acceptable reliability (CV = 3.71ā9.61%; ICC = 0.98ā0.95) was found for BSR, USKER, and USKEL. Furthermore, the coefficients between the two measures were strong (r = 0.963ā0.839) and highly significant (p = 0.001) for maximal strength in the isometric and maximal isometric/vibratory assessment of muscle strength in all muscle strength tests. This study demonstrates that isometric and maximal isometric/vibratory strength in the BSBP, BSR, USKER, and USKEL tests can be measured with high reliability and reproducibility using the FEMD.