Dynamics of Power Hand Tools on Operator Hand and Arm Stability

1994 ◽  
Vol 38 (10) ◽  
pp. 602-606 ◽  
Author(s):  
Seoungyeon Oh ◽  
Robert G. Radwin
Keyword(s):  
Perceived Exertion ◽  
Horizontal Distance ◽  
Subjective Ratings ◽  
Ratings Of Perceived Exertion ◽  
Hand Tools ◽  
Hand Tool ◽  
Power Hand Tools ◽  
Tool Dynamics

Threaded fastener tightening was studied to determine effects of tool dynamics (torque and build-up time) and workstation configuration (orientation, horizontal distance and height) on operator kinematics and ability to stabilize a right-angle power hand tool. Hand velocity, hand displacement, tool torque, and spindle angle were recorded during tool operation. Four subjects participated. Workstation factors and tool dynamics had significant effects on hand stability. The magnitude of hand velocity and displacement was significantly greater for (1) vertical work surfaces compared to horizontal work surfaces; (2) vertical work surfaces higher than 90 cm above the ground; (3) horizontal work surfaces 90 cm above the ground; (4) increasing torque levels, and (5) long torque build-up times. Subjective ratings of perceived exertion were greater for increasing torque levels, long build-up times, and increasing workstation heights. Perceived exertion was significantly related to hand velocity and displacement ( p<0.05), however, the strength of the correlation was small (R2 ranged between 0.01 and 0.10).

scholarly journals Vibration of Power Hand Tool and Discomfort Experience among Malaysian Industrial Workers

2013 ◽  
Vol 10 ◽  
pp. 313-317 ◽  
Author(s):  
Rahayu K. Seri ◽  
A. Nurulhuda ◽  
A. Rohana
Keyword(s):  
Industrial Workers ◽  
Hand Tools ◽  
Industrial Worker ◽  
Limit Value ◽  
Exposure Limit ◽  
Time Period ◽  
Hand Tool ◽  
Before And After ◽  
Long Time ◽  
Power Hand Tools

In reality, people who worked with power vibrating tools exposed with the vibrated syndrome that effect their normal life especially who involved for long time period. Hand-arm vibration (HAV) is a widespread hazard in many industries and occupations involving the use of handheld power tools or hand-fed machines. This paper describes a research and observation on the vibrating hand tool. The objective of this study is to measure and compare the grip strength and hand arm vibration before and after using the Ready-Reckoned standard for industrial workers. Continually, an analysis is conducted due to the pain and discomfort experience that face by the workers. This research also do the analysis about the effects of the vibration to the workers hand depend on the duration of handling the power hand tool. Hundred respondent was involved which 50 men and 50 women who had been identified as an industrial worker and working with power hand tools or machinery. The respondents were interviewed and answer Q-Survey that directly conducted at their workplace after doing the test. As the result, worker who works 8 hours per day, the exposure limit value (ELV) is 5m/s, it can cause fatal effects. Most of workers suffered with fingers that gone white on cold exposure and weakness in hand grip.

Effects of Drink Carbonation on the Gastric Emptying Characteristics of Water and Flavored Water

1991 ◽  
Vol 1 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Jeffrey J. Zachwieja ◽  
David L. Costill ◽  
Jeffrey J. Widrick ◽  
Dawn E. Anderson ◽  
Glenn K. McConell
Keyword(s):  
Gastric Emptying ◽  
Perceived Exertion ◽  
Cycle Ergometer ◽  
Sport Drink ◽  
Subjective Ratings ◽  
Ratings Of Perceived Exertion ◽  
Low Calorie ◽  
Gastric Aspiration ◽  
Flavored Water ◽  
Experimental Trials

The intent of this study was to determine whether adding carbonation to either water or a low calorie sport drink would affect gastric emptying (GE). Fifteen subjects rode for 20 minutes on a cycle ergometer at 55% of max . After 5 minutes of exercise, the subjects ingested 5.5 mllkg body weight of a test solution: water (W), carbonated water (CW), and a low calorie sport drink in both a carbonated (C2C) and noncarbonated (2C) form. At the end of each ride, the stomach was emptied through gastric aspiration. The results indicate that carbonation has no effect on GE. However, the type of drink did have an effect on GE, as both 2C and C2C emptied from the stomach at a slower rate than either W or CW. Subjective ratings of gastrointestinal comfort were similar for both carbonated and noncarbonated forms, and at no time did the subjects report discomfort. The results were independent of the exercise challenge, as exercise intensity, heart rate, and ratings of perceived exertion did not differ between experimental trials. It is concluded that carbonation does not affect the GE characteristics of a drink taken during submaximal exercise, but the flavoring system of the low calorie beverage decreased the rate of GE by as much as 25% when compared to water.

Recommendations for Aerobic Endurance Training Based on Subjective Ratings of Perceived Exertion in Healthy Seniors

2013 ◽  
Vol 21 (1) ◽  
pp. 100-111 ◽  
Author(s):  
Lars Donath ◽  
Lukas Zahner ◽  
Mareike Cordes ◽  
Henner Hanssen ◽  
Arno Schmidt-Trucksäss ◽  
...  
Keyword(s):  
Heart Rate ◽  
Endurance Training ◽  
Perceived Exertion ◽  
Rating Of Perceived Exertion ◽  
Maximal Heart Rate ◽  
Subjective Ratings ◽  
Treadmill Test ◽  
Ratings Of Perceived Exertion ◽  
Maximal Exercise Test ◽  
Walking Test

The study investigated physiological responses during 2-km walking at a certain intensity of a previously performed maximal exercise test where moderate perceived exertion was reported. Twenty seniors were examined by an incremental walking treadmill test to obtain maximal oxygen uptake (VO2max). A submaximal 2-km walking test was applied 1 wk later. The corresponding moderate perceived exertion (4 on the CR-10 scale) during the VO2maxtest was applied to the 2-km treadmill test. Moderate exertion (mean rating of perceived exertion [RPE]: 4 ± 1) led to 76% ± 8% of VO2maxand 79% ± 6% of maximal heart rate. RPE values drifted with a significant time effect (p= .001, ηp= .58) during the 2-km test from 3 ± 0.7 to 4.6 ± 0.8. Total energy expenditure (EE) was 3.3 ± 0.5 kcal/kg. No gender differences in ventilatory, heart-rate, or EE data occurred. Brisk walking at moderate RPE of 3–5 would lead to a beneficial physiological response during endurance training and a weekly EE of nearly 1,200 kcal when exercising 5 times/wk for 30 min.

Effect of exercise modality on ratings of perceived exertion at various lactate concentrations

1991 ◽  
Vol 23 (1) ◽  
pp. 88???92 ◽  
Author(s):  
R. K. HETZLER ◽  
R. L. SEIP ◽  
S. H. BOUTCHER ◽  
E. PIERCE ◽  
D. SNEAD ◽  
...  
Keyword(s):  
Perceived Exertion ◽  
Ratings Of Perceived Exertion ◽  
Exercise Modality
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