Ground Contact Time Balance Data; Vertical Oscillation And Vertical Ratio Data; Vo2 Max. Standard Ratings - Garmin D2 MACH1 Owner's Manual

Ground Contact Time Balance Data

Ground contact time balance measures your running symmetry and appears as a percentage of your total ground
contact time. For example, 51.3% with an arrow pointing left indicates the runner is spending more time on the ground
when on the left foot. If your data screen displays both numbers, for example 48–52, 48% is the left foot and 52% is the
right foot.
Color Zone
Symmetry
Percent of Other Runners
Ground Contact Time Balance
While developing and testing running dynamics, the Garmin team found correlations between injuries and greater
imbalances with certain runners. For many runners, ground contact time balance tends to deviate further from 50–50
when running up or down hills. Most running coaches agree that a symmetrical running form is good. Elite runners tend
to have quick and balanced strides.
You can watch the gauge or data field during your run or view the summary on your Garmin Connect account after your
run. As with the other running dynamics data, ground contact time balance is a quantitative measurement to help you
learn about your running form.

Vertical Oscillation and Vertical Ratio Data

The data ranges for vertical oscillation and vertical ratio are slightly different depending on the sensor and whether
it is positioned at the chest (HRM-Pro, HRM-Run
accessory).
Color Zone Percentile in Zone
Purple >95
70–95
Blue
30–69
Green
Orange 5–29
<5
Red

VO2 Max. Standard Ratings

These tables include standardized classifications for VO2 max. estimates by age and gender.
Males Percentile
Superior 95
Excellent 80
Good 60
Fair 40
Poor 0–40
74
Red Orange
Poor Fair
5% 25%
>52.2% L 50.8–52.2% L 50.7% L–50.7% R 50.8–52.2% R >52.2% R
, or HRM-Tri accessories) or at the waist (Running Dynamics Pod
™
Vertical Oscillation
Range at Chest
<6.4 cm
6.4–8.1 cm
8.2–9.7 cm
9.8–11.5 cm
>11.5 cm
20–29 30–39
55.4 54
51.1 48.3
45.4 44
41.7 40.5
<41.7 <40.5
Green
Good Fair
40% 25%
Vertical Oscillation Vertical Ratio at
Range at Waist Chest
<6.8 cm <6.1%
6.8–8.9 cm 6.1–7.4%
9.0–10.9 cm 7.5–8.6%
11.0–13.0 cm 8.7–10.1%
>13.0 cm >10.1%
40–49 50–59
52.5 48.9
46.4 43.4
42.4 39.2
38.5 35.6
<38.5 <35.6
Orange Red
Poor
5%
Vertical Ratio at
Waist
<6.5%
6.5–8.3%
8.4–10.0%
10.1–11.9%
>11.9%
60–69 70–79
45.7 42.1
39.5 36.7
35.5 32.3
32.3 29.4
<32.3 <29.4
Appendix