The effect of weighted vest walking on metabolic responses and ground reaction forces.
OBJECTIVE
This study examined how oxygen consumption, relative exercise intensity, vertical ground reaction forces (VGRF), and loading rate (LR) were affected while using a weighted vest (WV) during treadmill walking.


METHODS
A sample of 10 (aged 23.4 +/- 1.7 yr) subjects performed a standardized walking test (4-min stages at 0.89, 1.12, 1.34, 1.56, and 1.79 m x s(-1)) on a treadmill under four weighted vest conditions (0, 10, 15, and 20% of body mass (BM)). Dependent variables included oxygen consumption (VO2), relative exercise intensity, first (F1) and second (F2) peaks of the VGRF curve, and LR.


RESULTS
Repeated-measures ANOVA revealed significant vest versus speed interaction for V O2 and relative exercise intensity. Follow-up contrasts showed significant vest effect differences between 0% BM and all other WV conditions, and between 10 and 20% BM at all speeds for V O2. Follow-up analysis of relative exercise intensity demonstrated no significant vest effect difference at slower speeds, but significant differences at higher speeds. A significant main effect for WV condition was found for F1, F2, and LR. Follow-up testing revealed F1 and F2 at 0% BM were significantly different than at 10, 15, and 20% BM. F1 and F2 at 10% BM were significantly different than 20% BM, whereas F1 at 15% BM was significantly different than at 20% BM. LR at 0% BM was significantly different than at 15 and 20% BM.


CONCLUSIONS
Using a weighted vest can increase the metabolic costs, relative exercise intensity, and loading of the skeletal system during walking.
Puthoff
Michael L
ML
University of Iowa, Iowa City, IA, USA. puthoffmichaell@sau.edu
Darter
Benjamin J
BJ
Nielsen
David H
DH
Yack
H John
HJ