Table 1.
Physiologic characteristics of 6 elite distance runners on the AlterG® Anti-Gravity treadmill® by velocity and different levels of body weight support. Data are means (±SD).
Variable
8 min·mile
–1
(3.35 m·s
–1
)
p
a
7 min·mile
–1
(3.84 m·s
–1
)
p
6 min·mile
–1
(4.47 m·s
–1
)
p
5 min·mile
–1
(5.36 m·s
–1
)
p
VO
2
(ml·kg
–1
·min
–1
)
0% BWS
35.00 (1.55)
41.35 (1.66)
48.27 (2.03)
59.43 (1.68)
20% BWS
24.30 (2.29)
<.001
28.05 (2.02)
<.001
33.93 (3.16)
<.001
40.96 (4.73)
<.001
40% BWS
23.67 (2.27)
<.001
25.79 (2.42)
<.001
31.31 (3.76)
<.001
37.37 (4.76)
<.001
Test for 20% vs. 40% BWS
.724
.243
.204
.037
Net VO
2
(ml·kg
–1
·min
–1
)
0% BWS
29.34 (1.85)
35.68 (1.93)
42.60 (1.72)
53.76 (1.51)
20% BWS
19.29 (1.61)
<.001
23.04 (1.89)
<.001
28.38 (3.03)
<.001
35.96 (4.60)
<.001
40% BWS
18.63 (2.15)
<.001
20.75 (2.28)
<.001
26.28 (3.65)
<.001
32.36 (4.64)
<.001
Test for 20% vs. 40% BWS
.433
.086
.028
.536
RER (ratio of VCO
2
/ VO
2
)
0% BWS
0.85 (0.07)
0.89 (0.05)
0.91 (0.04)
1.00 (0.02)
20% BWS
0.80 (0.04)
.033
0.88 (0.04)
.478
0.88 (0.03)
.159
0.90 (0.05)
<.001
40% BWS
0.85 (0.06)
.974
0.87 (0.04)
.340
0.87 (0.03)
.097
0.88 (0.03)
<.001
Test for 20% vs. 40% BWS
.045
.779
.746
.471
HR (Beats Per Min)
0% BWS
123.4 (6.2)
134.5 (5.3)
151.8 (6.0)
171.5 (5.6)
20% BWS
105.4 (7.7)
.001
114.5 (8.0)
<.001
126.3 (10.0)
<.001
145.4 (13.7)
<.001
40% BWS
101.4 (12.0)
<.001
107.3 (10.1)
<.001
117.9 (10.6)
<.001
133.9 (12.2)
<.001
Test for 20% vs. 40% BWS
.484
.207
.138
.035
RPE (6-20)
0% BWS
9.3 (1.9)
11.7 (2.0)
14.3 (1.4)
16.8 (1.5)
20% BWS
8.3 (1.2)
.251
10.0 (2.0)
.058
12.3 (1.4)
.024
14.3 (1.2)
.005
40% BWS
7.3 (1.0)
.024
9.2 (1.5)
.005
12.0 (1.3)
.009
14.2 (1.3)
.003
Test for 20% vs. 40% BWS
.251
.338
.700
.847