Effects of resisted sled towing on sprint kinematics in field sport athletes

brontidegrrrMechanics

Nov 14, 2013 (3 years and 9 months ago)

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Effects of resisted sled towing on sprint kinematics in field sport athletes

R. Lockie*, A. Murphy & C. Spinks

University Of Technology, Sydney

Australian Conference of Science a
nd Medicine in Sport 2002:

Sports Medicine and Science at the Extremes

Sunday 13 October
-

Poster Program

Resisted sled towing is a common sprint training practice thoug
h little is known about the effects such practice has on sprint
technique. This study explored the effects of sled towing on acceleration sprint kinematics in field sport athletes.

20 men completed sprints without resistance, and with loads equating to 12
.6% and 32.2% of bodyweight. Infra
-
red and highspeed
video cameras recorded kinematic data during the trials.

Results showed that sled towing
:

R
educed stride length by ~10% and ~24% for each load, respectively.

Stride frequency also decreased, but not to

the extent of stride length.

Sled towing increased ground contact time and hip flexion. Trunk lean increased by ~3° and ~6° for each load, respectively. S
houlder
range of

motion increased by ~7° with heavier resistance.

The results also showed that the
heavier load generally resulted in a greater disruption to normal acceleration kinematics as compared
to the lighter load.

As such, the lighter load is likely a better guide for use in training if a coach wishes there to be minimal disruption to sp
rint ki
nematics,
while still overloading key aspects of sprint kinematics such as stride length and frequency. The findings from this study ar
e discussed
in terms of their practical application.