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by the University of Lausanne Switzerland
CASS (Centre Analyse Sport et Sante)
With the collaboration of Dr. Gremion
Orthopedic Hospital in Lausanne
Recently, an Australian university study concluded that using Kangoo
Jumps while running, jogging, or working out in an aerobic class,
reduced the potential for joint and spine aggravation or injury. The
results, researchers concluded, were due to Kangoo Jumps' unique leaf
spring design which softens the impact of each step.
The manufacturer wanted to investigate the calorie
burn rate of Kangoo Jumps compared to an aerobic activity such as
jogging. The aim was to gauge the proper intensity of an optimized
workout relative to calorie burn and the consumption of oxygen.
Initially, this product was created to reduce the
impact on the joints and tendons of the knees and ankles while jogging.
Since that time, it has been further modified and improved for use in
fitness centers for aerobic courses.
The overall aim of this study was to measure the difference, if any, of
caloric and oxygen consumption that is created by using Kangoo Jumps
instead of conventional running shoes. The physical differences between
them are obvious as Kangoo Jumps have a rigid shell, known as the outer
boot, that is fixed on two semi-spherical lamellas, or "clam shells",
that act as a "rebounding" spring.
A laboratory test was conducted to measure the
exchange of oxygen and to also calculate the caloric burn rate at each
speed of the exercise.
Eight (8) test subjects, four (4) male and four (4) females,
participated in the study. All of them are very fit and workout often,
while participating in one or more sports activities each week. All of
them had already used Kangoo Jumps a number of times and were familiar
with them prior to this experience.
The subjects participated in a progressive exercise that was designed
to determine the rate of oxygen consumption. The test was conducted on
a fitness center treadmill. The selection of the speed was determined
by a control console, set and moderated by scientific methods.
The exercises were executed on a slope of zero
percent (0%) and consisted of in running at different speeds on a
treadmill, specifically, eight (8), ten (10), and twelve (12)
kilometers per hour. Each stage lasted three (3) minutes, allowing a
state of equilibrium to be reached. There was no pause between the
succession of the stages.
The first half of the group began the session with
Kangoo Jumps and the other half with conventional running shoes.
Forty-fine (45) minutes later, the test is repeated after the
participants exchanged shoes.
The cardiac frequency was continuously measured by
a Baumann's belt (BHL 6000) and was monitored and processed by the
software program AncarElite 2.0 (Baumann). Ventilation is obtained by
integrating the measure of the flow. Oxygen consumption, or the
breathing rate, was also calculated. All factors were calculated within
a mean of thirty (30) seconds, while also taking into account the
subject's temperature and blood pressure.
The results of caloric burn rate, ventilation, breathing rate, oxygen
consumption and cardiac frequency for each subject are available upon
request. Researchers concluded that half of the subjects reached or
exceeded their anaerobic limit while using Kangoo Jumps at 12 km/h. The
mean caloric burn rate obtained by the eight subjects, at 8, 10 and 12
km/h with Kangoo Jumps is, respectively, 154, 165 and 206 Cal/min/kg.
With absolute or relative value (/kg), the oxygen
consumption is significantly higher (p<0,05) with Kangoo Jumps
compared to jogging while using conventional running shoes.
This difference is greater at lower speeds than at
higher speeds. In fact, at 8 and 10 km/h, the difference varies between
twenty (20%) and thirteen (13%) percent, respectively, while at 12
km/h, the variation is only seven (7%) percent.
This diminution is also valid for the values of
energetic expense using the equation kcal/min. In fact, the subjects
using Kangoo Jumps, obtained values that were superior to the use of
conventional running shoes, ie: nineteen (19%) percent at 8 kilometers
per hour and seven (7%) percent at 12 km/h.
The results that were obtained confirm the previous hypothesis:
The energetic expense is higher, at a same speed,
using Kangoo Jumps compared to the use of conventional running shoes
Yet, it is interesting to notice that the more the
speed increases, the more the difference diminishes. This could be due
to the fact that many subjects, at a speed of 12 km/h have reached or
exceeded their anaerobic limit (QR>1), showing the anaerobic
phase and the values of oxygen consumption (with or without Kangoo
Jumps) come up to a common level. Furthermore, for these same subjects,
no significant difference concerning cardiac frequency is observed at
12 km/h, which would confirm the hypothesis that these subjects are
very close to their "limit".
Bio-mechanical factors should also be taken into
account. At low speeds, it is possible to better utilize the elasticity
of the Kangoo Jumps' T-spring band. Yet, the more the speed increases,
the more the rate increases, the time of contact decreases, so the use
of elasticity of the Kangoo Jumps is very much diminished or even
The movement of the Kangoo Jumps imitates more and
more the movement of jogging, which would diminish the energetic
expense per kilometer and consequently the oxygen consumption.
Furthermore, with the increase of the speed, the subject tends to bend
forward, which prevents him to make the best use of Kangoo Jumps.
In fact, Kangoo Jumps are built so that the maximum
elasticity is obtained when the subject presses vertically on the
shoes. The research concludes that it would be better to work at low
speed or at low rate.
It is also worth noticing that with the subjects
that use Kangoo Jumps on a regular basis (subjects 2,4 and 6), the
difference of their oxygen consumption is nine (9%) percent at 8 km/h
and is negligible at 12 km/h. So, part of the difference obtained in
average results can be explained by lower performances on behalf of the
subjects that are not used to using Kangoo Jumps.
Kangoo Jumps, for adults, are best suited for those who wish to
experience a significant energetic expense while reducing the negative
impact on the joints and spine . We notice that at a same speed, the
energetic expense with Kangoo Jumps is the same as jogging while
running at a speed of two (2) km/h slower. Kangoo Jumps greatly lessen
the injurious impact on the ankles, knees, and spine for two reasons:
1) The unique spring design decreases the normal pounding effect of
running, and 2) The runner obtains more "air time" resulting in less
actual impacts with the running surface. Finally, the use of the Kangoo
Jumps can be useful in the rehabilitation of both athletes and "normal"
active people that are recovering from "sports related" injuries.
We are very thankful for Dr.
Gremion's valuable collaboration on this project