A Study and Review of Human Response to Prolonged Random Vibration

Hornick, Richard J.; Lefritz, Norman M.

doi:10.1177/001872086600800602

Cited by 23 publications

(18 citation statements)

References 7 publications

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“…The higher heart rate recorded in the HSV group, although not statistically significant, agrees with the findings of other studies, which report increased HR during a short period of exposure to WBV (22,35). After 5 minutes of recovery time, the heart rate of the HSV group was lower than that of the HS group, suggesting a faster recovery.…”

Section: Discussionsupporting

confidence: 91%

Influence of Vibration Training on Energy Expenditure in Active Men

Silva

Fernández

CASTILLO

et al. 2007

Journal of Strength and Conditioning Research

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J. Strength Cond. Res. 21(2):470-475. 2007.-The aim of the present study was to analyze the effect of whole-body vibration on energy expenditure, as well as on exercise intensity, during and immediately after a typical set of exercises for muscle hypertrophy in physically active subjects. Seventeen male university students (mean age 18.3 Ϯ 0.24 years) volunteered to perform 2 different training exercises: half squat (HS), and half squat with vibration (HSV). Both exercises were performed by all subjects on the vibration platform (with vibration only for HSV), the sequence order being assigned randomly. Energy expenditure (EE), respiratory exchange ratio, perceived exertion (PE), and heart rate were recorded for baseline, exercise, and short-recovery conditions. Training consisted of 5 sets of 10 repetitions of HS and HSV, with a 2-minute recovery interval between sets. Analysis of variance with repeated measurements and Bonferroni correction, as well as effect size were used for statistical calculations. Results indicated that EE and PE were significantly higher in the HSV group, during both exercise and recovery. Heart rate did not differ significantly between groups. Thus, it would appear that HS strength training could be rendered more energy-efficient through the addition of vibration. Moreover, it would be feasible to introduce vibration exercises into regular training programs, particularly those whose key objective is muscle hypertrophy along with fat reduction.

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Section: Discussionsupporting

confidence: 91%

Influence of Vibration Training on Energy Expenditure in Active Men

Silva

Fernández

CASTILLO

et al. 2007

Journal of Strength and Conditioning Research

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“…Another parameter systematically varied by some experimenters (Parks, 1961;Weisz, Goddard, and Allen, 1965) is the vibration waveform. Most common is a sinusoidal waveform; the next most common is a narrowband random waveform centered at a given frequency (our interpretation of what Weisz, et al, call random amplitude, sinusoidal vibration, and what Parks calls fixed-period, random-amplitude vibration); and a few experimenters (Holland, 1966;Hornick and Lefritz, 1966;Weisz et al, 1965) have used broadband random vibration. Holland (1966) varied the frequency at which the peak power of broadband random vibration was located.…”

Section: Variables In Tracking Studiesmentioning

confidence: 94%

“…(Holland, 1966). Several investigators (Holland, 1966;Hornick and Lefritz, 1966;Hornick, Boettcher, and Simons, 1961;Schmitz, Simons, and Boettcher, 1960;Soliday and Schohan, 1964;Schohan, Rawson, and Soliday, 1965) have compared performance at different times during periods of continuous vibration.…”

Section: Augustmentioning

confidence: 99%

Decrements in Tracking and Visual Performance during Vibration

Collins

1973

Hum Factors

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This literature review specifies the decrements in human performance on tracking and visual acuity tusks during vibration in terms of frequency, acceleration, and direction of vibration. For z-axis (vertical) vibration, which has been studied most extensively, it has been possible to develop tentative equal-decrement curves in terms of frequency and acceleration. For x-axis (longitudinal) and y-axis (lateral) vibration, there are not enough data to do SO. The effects of other variables are discussed briefly, and an hypothesis is offered for translating experimental results into predictions of performance decrements for workers in vibration environments. INTRODUCTIONWhen people are subjected to vibration, their ability to perform tasks is often substantially impaired. In addition to causing discomfort (and sometimes sickness), vibration interferes with the ability to see clearly, as when reading instruments or written materials, and the ability to control one's bodily movements precisely, as when steering or writing. Such degradation of human performance leads to inefficient and even hazardous operation of air, sea, and land vehicles in which vibration inevitably occurs.The principal aim of this literature review is to determine how direction, frequency, and acceleration (or amplitude) of vibration affects tracking and visual performance. Ideally, a vehicle designer would like to determine, in advance, how large the decrement in performance on various tasks will be for a person operating a vehicle with certain frequency and acceleration characteristics. In this review the intention is to extract, from the literature, estimates of performance decrements in representative tasks across a broad range of frequencies and accelerations. With this kind of information, the design of new vehicles and improvement of existing vehicles can be directed toward minimizing the types of motion most detrimental to task performance.This review is divided into three major sections: (1) the effects of vibration on tracking tasks; (2) the vibration effects on visual acuity (Data from various sources are plotted on acceleration vs. frequency graphs and lines of equal decrement in performance are drawn where possible); and (3) recommendations for future experimental research.The measure of vibration most commonly used in the literature is the zero-to-peak value of sinusoid acceleration. However, the rootmean-square value is typically used as a measure of random vibration. To make graphs easily comparable, rms accelerations have been converted to "equivalent" zero-to-peak values by multiplying all rms levels by fi Grether (1971) has written a comprehensive review of the literature on vibration and human performance. This paper ~ extends Grether ' s conclusions in several significant ways. First, the figures in this paper make it possible to compare percentage decrements across various studies in the tracking and visual performance literature. Second, the important problem of translating results from sinusoidal vibration studies into predic...

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“…Poorer vigilance performance under viLration was found by Hornick and Lefritz (1966), and Shoenberger (1969). Harris and S3mmer (1971) found that high intensity noise endI vibration combine to produce a decrement in mental subtr 1 ztion ability.…”

Section: Central Neural Processesmentioning

confidence: 80%

Navy Vehicle Design and Construction: Measurement of Triaxial Vibration at SIGNIFICANT Human Interface Points on the CH-47C and SH-3A Helicopters

Hutchins¹

1972

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A Study and Review of Human Response to Prolonged Random Vibration

Cited by 23 publications

References 7 publications

Influence of Vibration Training on Energy Expenditure in Active Men

Influence of Vibration Training on Energy Expenditure in Active Men

Decrements in Tracking and Visual Performance during Vibration

Navy Vehicle Design and Construction: Measurement of Triaxial Vibration at SIGNIFICANT Human Interface Points on the CH-47C and SH-3A Helicopters

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