ACUTE EFFECTS OF DIFFERENT TYPES OF SQUAT CONTRACTION ON SUBSEQUENT DROP JUMP PERFORMANCE IN REGARDS TO POSTACTIVATION POTENTIATION
Author
Watson, John
Date
2014Type
Thesis
Publisher
Cardiff Metropolitan University
Metadata
Show full item recordAbstract
Recent literature has repeatedly demonstrated the ability to enhance subsequent
performance by exploiting a postactivation potentiation response in muscle groups.
However no investigation has looked to compare different types of muscular contraction on
subsequent drop jump performance. The purpose of this study was to investigate the
effects of either a dynamic, eccentric or isometric muscle contraction upon subsequent
drop jump performance. Nine competitive male rugby players (mean ± SD: age 21.2 ± 0.79
years, body mass 95.3 ± 13.51 kg, height 180.3 ± 8.43 cm, back squat 1RM 178.3 ±
20.82 kg) performed a baseline measure drop jump, they each then performed the set
intervention protocol of a dynamic, eccentric or isometric back squat followed by 7 minutes
of recovery time. Peak force, time to peak force, peak rate of force development, reactive
strength index and jump height were assessed using an AMTI force platform (AMTI, USA).
The results reported that there was no significant effect found for peak force (p<0.05), time
to peak force (p<0.05), peak rate of force development (p<0.05), reactive strength index
(p<0.05) or jump height (p<0.05) following each of the contraction interventions. However
an individual analysis of “responders” found a significant difference (p<0.05) in peak force
following the dynamic contraction intervention. Consequently the results suggest that the
use of any contraction type has no significant effect upon subsequent drop jump
performance in male collegiate players, however the individual analysis shows scope for
further research into the protocol used for a larger population. From the findings of this
research strength and conditioning coaches can accept that although there is no
significant difference of different contraction types on subsequent drop jump performance,
there is also no significant negative effect.
Description
DEGREE OF BACHELOR OF SCIENCE (HONOURS)
SPORT CONDITIONING, REHABILITATION AND
MASSAGE
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