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This study examines the hypothesis that abdominal body composition may modulate the effects that back belts have upon the respiratory function of the wearer. Twelve subjects were divided into two groups based upon abdominal skinfold thickness. Respiratory parameters were compared between groups, between belt-wearing conditions, and between activity levels. Tidal volume ( V T ) and respiratory frequency ( f ) were monitored at rest; during a repetitive lifting task; and during recovery from this lifting task. Forced vital capacity (FVC) and forced expiratory volume (FEV 1 ) were measured during rest and recovery. During exercise, the back belt significantly decreased tidal volume in the high abdominal fat group and increased tidal volume in the low abdominal fat group (Prob> F =0.0002). This study showed no other significant differences in respiratory responses between groups. It is concluded that the abdominal body composition of a given subject can modify the physiological effects of back belts on the respiratory system. It is suggested that abdominal body composition should be controlled for in future studies of the effects of abdominal compression. Relevance to industry Individuals with central obesity and/or preexisting lung disease may experience modifications in lung function that could limit their performance when wearing a back belt. The results of this study, therefore, are relevant to medical practitioners, safety officers, and workers performing manual materials handling tasks. |
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