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The physiological cost of carrying loads in temperate and hot environments.

Authors
Kamon-E; Belding-HS
Source
Hum Factors 1971 Apr; 13(2):153-161
NIOSHTIC No.
00013487
Abstract
Cartons weighing 10, 15 and 20 kg were carried by 3 pretrained subjects with the hands in front of the body at speeds of 4 and 5 kilometers per hour on the level and on 4 percent gradient at dry ambient temperatures of 20, 35 and 45 degrees centigrade; each test involved three 5-minute periods of load carrying, walking without load and sitting. At each speed, step rate increased with load- weight increase, although the increase (but not total cost) was less when carrying up hill. Metabolic cost per total weight of body and load also increased with load increase; thus work efficiency decreased. The metabolic cost for each kg of load carried was 1.3- 2.3 times greater than the cost per kg body weight without load. No significant differences in metabolic cost were observed under the 3 thermal conditions but heart rate increased 7-10 beats per minute for each 10 degrees centigrade air-temperature rise. It is concluded that physiologically, 15-kg packages are perferable to 10- and 20-kg packages when large amounts of material must be manhandled.
Keywords
NIOSH-Publication; NIOSH-Grant; Physiological-effects; Heart-rate; High-temperature; Thermal-effects
Contact
Occupational Health Univ of Pittsburgh Sch of PH 130 DE Soto Street Pittsburgh, PA 15213
CODEN
HUFAA6
Publication Date
19710401
Document Type
Journal Article
Funding Amount
152509
Funding Type
Grant
Fiscal Year
1971
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-00308
Issue of Publication
2
ISSN
0018-7208
Source Name
Human Factors
State
PA
Performing Organization
University of Pittsburgh, Pittsburgh, Pennsylvania
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