Does physical fitness level impact body balance and physiological responses after a 4km load carriage task?
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Abstract
It is not known whether higher physical fitness level (PFL) is really an advantage for military personnel in operational tasks. Objective: To investigate the effects of PFL on body balance and physiological responses in a 4 km load carriage task. Body balance was analyzed (n=22) using personal equipment (22 kg) before and after the 4km load carriage (treadmill). Heart rate (HR) was assessed throughout the task and PFL considered the result of the most recent Brazilian Army physical fitness test. Two-way mixed ANOVA and independent t-tests were applied (p<0.05). Load carriage significantly increased sway area (72.21±30.94 to 102.68±48.57 mm2) and other balance variables, without effects of PFL. The group with excellent PFL had lower mean HR values (104.55±9.37 bpm) compared with the group with good or very good PFL (115.07±10.14 bpm). Carrying 22 kg for 4 km worsened body balance and the military personnel with better PFL performed this task with less cardiac effort.
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