Nutritional deprivation in childhood and the body size, activity, and physical work capacity of young boys

1979 ◽  
Vol 32 (9) ◽  
pp. 1769-1775 ◽  
Author(s):  
K Satyanarayana ◽  
A N Naidu ◽  
B S Narasinga Rao
Author(s):  
Grzegorz Bielec ◽  
Aneta Omelan

Objective. The COVID-19 pandemic led to restricted access to sports and recreation facilities, resulting in a general decrease in physical activity. Many studies present the results of on-line questionnaires conducted during the pandemic, but there are few reports of objectively measured indicators of physical condition. Thus, the objective of this study was to assess the changes in physical work capacity, body composition, and physical activity behaviors in university students during 14 weeks of lockdown. Material and Methods. Twenty students of Tourism and Recreation (13 female and 7 male) participated in the study. The first examination was conducted in November 2020, and the second in March 2021. Body composition was assessed with a Tanita 418 MA device. The students performed the PWC 170 cycling test and completed the International Physical Activity Questionnaire (short version) on-line. Results. Neither physical work capacity nor body composition parameters changed substantially during the analyzed period. In the female students, vigorous physical activity decreased significantly, but no substantial changes occurred in weekly metabolic equivalent of task. In male students, walking days and metabolic equivalent of task decreased, but the changes were not significant. Conclusions. Fourteen weeks of COVID-19 lockdown had little effect on the body composition, physical work capacity level, and physical activity habits of Tourism and Recreation students. Studies with larger groups of participants should verify the current conclusions, and care should be taken when extrapolating to other populations.


1961 ◽  
Vol 16 (1) ◽  
pp. 153-156 ◽  
Author(s):  
Theodor Hettinger ◽  
Newton C. Birkhead ◽  
Steven M. Horvath ◽  
Bela Issekutz ◽  
Kaare Rodahl

Maximal oxygen uptakes were compared with the results from five different tests of physical work capacity in 96 men, 23–62 years of age. In addition, the 'predicted' maximal oxygen uptakes, according to the Ǻstrand-Ryhming nomogram, were compared with the actual measured maximal oxygen uptakes in the 28 subjects who were between 20 and 30 years of age. There was a statistically significant correlation between the maximal oxygen uptake and the following tests: the Harvard step test (P < .001); a new modified step test in which adjustments were made for the body weight and the length of the legs of the subject (P < .001); the Master step test (P < .05); and the Amplituden-Puls-Frequenz test, (P < .02). There was no statistically significant correlation between the maximal oxygen uptake and the Leistungs-Pulsindex. The correlation between the predicted maximal oxygen uptake and the measured maximal oxygen uptake was statistically significant at the .01 level. Submitted on May 16, 1960


1981 ◽  
Vol 25 (1) ◽  
pp. 426-430
Author(s):  
M. M. Ayoub ◽  
J. L. Selan

A biomechanical and work physiology study was conducted on low coal miners. The biomechanical analysis consisted of comparing the anthropometric and isometric strength characteristics of miners to other populations; the work physiology portion consisted of identifying demanding tasks via a task analysis, determining energy requirements for demanding tasks, and determining percentage of VO2 max required for demanding tasks. Miners show increased musculature of those body segments most stressed in their work environment and few differences in strength compared to other groups. Highly demanding tasks identified were roof bolting, timbering, miner and bolter helper, shoveling, stoopwalking, and crawling. Energy expenditure estimates on underground tasks indicate that these tasks fall under the category of heavy work. Miners work up to 66% of their physical work capacity when performing their underground tasks. Work and rest schedules based on predicted endurance times for both male and female miners is discussed, along with biomechanical stresses on the body for certain tasks.


2005 ◽  
Vol 1280 ◽  
pp. 156-160 ◽  
Author(s):  
J. Bugajska ◽  
T. Makowiec-Dąbrowska ◽  
A. Jegier ◽  
A. Marszałek

1980 ◽  
Vol 48 (6) ◽  
pp. 1060-1064 ◽  
Author(s):  
R. M. Glaser ◽  
M. N. Sawka ◽  
M. F. Brune ◽  
S. W. Wilde

The purpose of this investigation was to compare physical work capacity (PWC), peak oxygen uptake (peak VO2), maximal pulmonary ventilation (VEmax), maximal heart rate (HRmax), and maximal blood lactate concentration (LAmax) for wheelchair ergometer (WERG) and arm crank ergometer (ACE) exercise. For this, wheelchair-dependent (n = 6) and able-bodied (n = 10) subjects completed a progressive intensity, discontinuous test for each mode of exercise. Each test was terminated by physical exhaustion and/or an inability to maintain a flywheel velocity of 180 m.min-1. Relatively high correlation coefficients were found between values obtained during the two modes of ergometry for PWC, peak VO2, VEmax, and HRmax. WERG exercise was found to elicit a significantly (P less than 0.05) lower PWC (by 36%), HRmax (by 7%), and LAmax (by 26%) than ACE exercise. Peak VO2 and VEmax, however, were similar for both exercise modes. These data suggest that either exercise mode may be used for fitness testing and training of people who cannot use their legs and that arm cranking may be a superior method to propel wheelchairs.


1987 ◽  
Vol 31 (12) ◽  
pp. 1331-1335
Author(s):  
Jeffrey E. Fernandez ◽  
Robert J. Marley ◽  
Nancy B. Stubbs

A laboratory experiment using 15 male subjects was conducted to document lifting physical work capacity over the frequency range of 2 to 12 lifts per minute and to compare these values to bicycling physical work capacity. Results indicate that bicycling PWC is significantly higher than lifting PWC at the 0.05 level. A variation in lifting PWC as a function of frequency was observed. This could be attributed to lifting technique. Task design should, therefore, not only consider lifting PWC but also the frequency of lift.


2021 ◽  
Author(s):  
Josh Foster ◽  
James W Smallcombe ◽  
Simon G Hodder ◽  
Andreas D Flouris ◽  
Lars Nybo ◽  
...  

It is well-known that heat impacts human labour/physical work capacity (PWC), but systematic evaluations of solar radiation (SOLAR) effects and the interaction with air temperature and humidity levels and clothing are lacking, as most lab-studies are conducted in semi-nude subjects without radiation or only in a single climatic condition. Due to the high relevance of SOLAR in various occupations, this study quantified how SOLAR interacts with clothing and other primary environmental factors (air temperature/humidity) of importance to determine PWC in the heat. The data allowed the development of a SOLAR correction factor for predicting PWC in major outdoor industries. Fourteen young adult males (7 wearing a standardised work coverall (0.9 Clo), 7 with shorts and trainers (0.3 Clo) walked for 1-hour at a fixed heart rate of 130 b∙min-1, in seven combinations of air temperature (25 to 45 Celsius) and relative humidity (20 or 80%), with and without SOLAR (800 W/m2 from solar lamps). Cumulative energy expenditure in the heat, relative to the work achieved in a cool reference condition, was used to determine PWC%. Skin temperature was the primary determinant of PWC in the heat. In dry climates with exposed skin (0.3 Clo), SOLAR caused PWC to decrease exponentially with rising air temperature, whereas work coveralls (0.9 Clo) negated this effect. In humid conditions, the SOLAR-induced reduction in PWC was consistent and linear across all levels of air temperature, and clothing conditions. WBGT and UTCI based prediction equations of PWC represented SOLAR correctly. For heat indices not intrinsically accounting for SOLAR, correction factors are provided enabling forecasting of heat effects on work productivity.


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