Physiological responses to maximal treadmill and handweighted exercise
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ABSTRACT:
The purpose of this investigation was to compare the peak physiological responses among four protocols that employed different amounts of handweighted exercise in 16 males (aged 26.3 plus/minus 4.1 years). The four protocols were (a) uphill treadmill running (UR; 3.36 m.s-1, 2.5 percent grade increase.3min-1); (b) uphill treadmill walking while pumping 1.36-kg handweights (HW) (UWHW; 1.79 m.s-1, 5.0 percent grade increase.3min-1; (c) treadmill walking while pumping .91-kg HW (WHW; 1.79 m.s-1, 0 percent grade, .91-kg HW increase.3min-1); and (d) standing in place and pumping HW (SHW; arm work as described in WHW). It was hypothesized that the peak responses would be inversely proportional to the estimated muscle mass activated (i.e., UR = UWHW greater than WHW greater than SHW). Dependent variables included peak oxygen uptake (VO2 peak), peak heart rate (HRpeak), peak ventilation (Ve peak), and peak respiratory exchange ratio (RER peak). No differences were noted between UR and UWHW with respect to any of the dependent variables. All variables (except RER peak) were greater (p less than .01) in UR and UWHW than either WHW or SHW. RER peak was greater (p less than .01) in UR and UWHW, WHW, and SHW, respectively. Therefore, walking and pumping handweights provides a maximal stimulus to the oxygen transport system.
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