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Effects of loggers' protective clothing on thermoregulation.

Authors
Coca-A; Powell-JB; Kim-J-H; Williams-WJ; Roberge-RJ
Source
Med Sci Sports Exerc 2012 May; 44(5S)(Suppl 2):477-478
NIOSHTIC No.
20041973
Abstract
Heat stress is common among forestry workers, including loggers. PURPOSE: Evaluate the thermal responses to wearing loggers' protective clothing (LPC) while performing moderate intensity exercise in the heat. METHODS: Six healthy male participants performed two trials of treadmill exercise in a warm environmental chamber (35C, 50% relative humidity [RH]) while wearing either sports clothes (CON) or LPC which included a safety vest, chainsaw chaps, gloves, safety helmet, long trousers, long sleeve shirts, wool socks and boots. The study protocol consisted of two stages of 20 min of exercise at a relative workload of 30% and 50% VO2max. The participants then performed a chainsaw maneuver (sawing motion against a vertical object) for 1 min followed by a recovery period (15 min rest) in the chamber. Study variables included core temperature (Tco), mean skin temperature (Tsk), and heart rate (HR). Data were analyzed by two-way (Trials Time) repeated measures ANOVA. RESULTS: All 6 subjects (CON) completed 41 min of exercise for CON, but only averaged 38.7 min of exercise (37.7 min treadmill and 1 min chainsaw maneuver) while wearing LPC. Tco in the LPC was higher than CON. However, it was only statistically higher in the recovery time suggesting that wearing LPC in warm environments hinders the recovery of the users. CONCLUSION: Wearing LPC while exercising in the heat at the study specific workloads did impose a significant thermal burden on the wearer evidenced by the elevated HR and Tsk values in the LPC. Tco did not decrease in 15min recovery, showing that LPC imposes a thermal load on the user that may cause heat stress over time if no actions are taken to limit the risk.
Keywords
Heat; Heat-stress; Forestry-workers; Logging-workers; Thermal-effects; Thermal-reactions; Personal-protective-equipment; Personal-protection; Protective-clothing; Protective-equipment; Physical-exercise; Physiological-effects; Physiological-factors; Physiological-stress; Temperature-effects; Temperature-measurement; Statistical-analysis
CODEN
MSPEDA
Publication Date
20120501
Document Type
Abstract
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
B20130124
Issue of Publication
5S
ISSN
0195-9131
NIOSH Division
NPPTL
Priority Area
Agriculture, Forestry and Fishing
Source Name
Medicine and Science in Sports and Exercise
State
PA
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