Research of the force characteristics of hydraulic cylinder type loading devices for exercise machines

Domeika, Aurelijus; Eidukynas, Valdas; Grigas, Vytautas; Šulginas, Anatolijus

doi:10.5755/j01.mech.20.5.8425

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Supplementary analysis was carried out to verify the final design (base valve with 25 channels of 0.8 mm diameter) and the computational model of the MR resistive exercise device. The resistance force generated by a device with such parameters operating in a passive mode (with no effect of the magnetic field on MR fluid viscosity) was calculated and compared with the results of experimental research of regular hydraulic cylinder number 2 (having the same diameter piston) used in a rowing machine [ 27 ]. It was found that the calculated values of the resistance force (at different piston speeds) differ from those obtained experimentally less than 2.5%.…”

Section: Resultsmentioning

confidence: 99%

“…In order to collect more information about functionality of the HC type load generating units used in lever-type rowing machines, experimental research of their resistance force was carried out [ 27 ]. The variation of resistance force size during the stroke of adjustable hydraulic cylinders taken from three rowing machines was measured at different operating modes: the speed of rod extraction, resistance level of the cylinder, and the temperature of the cylinder.…”

Section: Structure and Main Properties Of The Lever-type Rowing Mamentioning

confidence: 99%

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Development of Magnetorheological Resistive Exercise Device for Rowing Machine

Grigas

Šulginas

Žiliukas

2016

Computational and Mathematical Methods in Medicine

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Training equipment used by professional sportsmen has a great impact on their sport performance. Most universal exercisers may help only to improve the general physical condition due to the specific kinematics and peculiar resistance generated by their loading units. Training of effective techniques and learning of psychomotor skills are possible only when exercisers conform to the movements and resistance typical for particular sports kinematically and dynamically. Methodology of developing a magnetorheological resistive exercise device for generating the desired law of passive resistance force and its application in a lever-type rowing machine are described in the paper. The structural parameters of a controllable hydraulic cylinder type device were found by means of the computational fluid dynamics simulation performed by ANSYS CFX software. Parameters describing the magnetorheological fluid as non-Newtonian were determined by combining numerical and experimental research of the resistance force generated by the original magnetorheological damper. A structural scheme of the device control system was developed and the variation of the strength of magnetic field that affects the magnetorheological fluid circulating in the device was determined, ensuring a variation of the resistance force on the oar handle adequate for the resistance that occurs during a real boat rowing stroke.

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Section: Resultsmentioning

confidence: 99%

Section: Structure and Main Properties Of The Lever-type Rowing Mamentioning

confidence: 99%

Development of Magnetorheological Resistive Exercise Device for Rowing Machine

Grigas

Šulginas

Žiliukas

2016

Computational and Mathematical Methods in Medicine

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“…They report 7% and 9.3% average 1RM errors, so a user can get fairly accurate 1RM without repeating the exercise to the limit. On the other hand, workout machines using hydraulic cylinders, such as rowing simulators or steppers, have recently been used in sports and rehabilitation centers [12]. Unlike conventional machines that use weight plates and work against gravity, hydraulic fitness machines can easily control their load weights by simply turning valve knobs.…”

Section: Introductionmentioning

confidence: 99%

Estimation of 1-Repetition Maximum Using a Hydraulic Bench Press Machine Based on User’s Lifting Speed and Load Weight

Yoo

Kim

Hwang

et al. 2022

Sensors

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1-repetition maximum (1RM), a representative index for an individual’s weightlifting capacity, provides an organized workout guide, but to measure 1RM needs several repetitive exercises up to one’s limit and has a risk of injury, thus, not adequate for beginners, elders, or disabled people. This study suggests a simpler and safer 1RM measurement method using a hydraulic fitness machine. We asked twenty-five female subjects with less than a month of experience in weight training to repeat chest exercises using a conventional plate-loaded bench press machine and a hydraulic bench press machine and measured 1RMs. Repeated-measures ANOVA and paired t-test reported the difference between the plate and hydraulic 1RMs insignificant (p-value = 0.082) and confirmed the generality of 1RM across the different types of fitness machines. We then derived several 1RM equations in terms of load weight W and lifting speed v during non-1RM exercise and reduced it to a first-order polynomial expression 1RM=−0.3908+0.8251W+0.1054v with adjusted R-square of 0.8849. Goodness-of-fit test and comparison with 1RM equations from reference studies (v=−1.46×W1RM+1.7035, W1RM×100=7.5786v2−75.865v+113.02) verified our formula valid. We finally simplified the 1RM measurement process up to a maximum of three repetitions.

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Research of the force characteristics of hydraulic cylinder type loading devices for exercise machines

Cited by 2 publications

References 4 publications

Development of Magnetorheological Resistive Exercise Device for Rowing Machine

Development of Magnetorheological Resistive Exercise Device for Rowing Machine

Estimation of 1-Repetition Maximum Using a Hydraulic Bench Press Machine Based on User’s Lifting Speed and Load Weight

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