Prospective Study and Results From the German Sports University of Cologne Biomechanics and...

Prospective Study and ResultsFrom the German Sports University of CologneBiomechanics and Orthopedics InstituteProfessor Peter BrueggemannNovember 2003 to April 2004

1. To demonstrate possible benefits.

2. To quantify effects on Flexibility,

Strength and Performance.

Rationale:

Results in more intensive use of biological structures

Use of biological systems: Makes them stronger

Hypothesis:

Barefoot / Nike FREE training: Does get the system

(Intervention Through Nike FREE Footwear)

• subgroup EG-A: master athletes

• subgroup EG-B: PE students

(No Intervention, Conventional Footwear)

• subgroup CG-A: master athletes

• subgroup EG-B: PE students

30 males, 27 females (57)

22 males, 21 females (43)

Total number of subjects under study: 100

Use of Nike FREE footwear for 30 minute warm-ups

3 – 4 times per week.

Use of conventional training shoes

Nov-03 March-April-04

200

300

250

Flexor strength, left

Experimental Control

p: 0.001 n.s.

N

PRE POST PRE POST

Statistically significant difference

200

300

250

Flexor strength right


p: 0.01 n.s.

N

PRE POST PRE POST


200

300

250

Flexor strength left & right


p: 0.01 n.s.

N

PRE POST PRE POST

L R L R L R L R

Statistically significant differences

10

50

Change of MPJ flexor strength through intervention


p: 0.01

30

70

90

N

left right left right


1100

1300

1200

Plantar flexion strength, left


p: 0.01 n.s.

N

PRE POST PRE POST


- 50

50

Change of plantarflexor strength through intervention


p: 0.01

0

100

200

N left


- 10

10

Change of dorsiflexor strength through intervention


0

20

30

N

left right left right


Minimum MPJ angle


p: 0.01

deg

PRE POST PRE POST

50

45

40

35

n.s. Statistically significant difference

Pressure Distribution PlatformMarker

Start / Finish

• Sidesteps as fast as possible

• 4 times back and forth (20m)

• Performance criterion: Total running time

200

300

250

Flexor strength, left


p: 0.001 n.s.

N

PRE POST PRE POST


Shuttle run performance, time


p: 0.01 sec

PRE POST PRE POST

- 8

- 7

- 6

- 5



p: 0.001

sec

PRE

- 0.5

- 1.0

Change of shuttle run performance timethrough intervention



p: 0.01 sec

PRE POST PRE POST

1.5

1

0.5


Shuttle run contact time

Shuttle run performance, time


p: 0.01 sec

PRE POST PRE POST

- 8

- 7

- 6

- 5



p: 0.001

sec

PRE

- 0.5

- 1.0

Change of shuttle run performance timethrough intervention



p: 0.01 sec

PRE POST PRE POST

1.5

1

0.5


Shuttle run contact time

Prospective Study and Results From the German Sports University of Cologne Biomechanics and...

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