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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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THE ACUTE EFFECTS OF BACK SQUATS ON VERTICAL JUMP PERFORMANCE IN MEN AND WOMEN |
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Chad A. Witmer  ,
Shala E. Davis and Gavin L. Moir |
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Exercise Science Department, East Stroudsburg University of Pennsylvania, USA |
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© Journal of Sports Science and Medicine (2010) 9, 206 - 213 |
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| ABSTRACT | |||
| The aim of the present study was to investigate the acute effects
of performing back squats on subsequent performance during a series of vertical
jumps in men and women. Twelve men and 12 women were tested on three separate
occasions, the first of which was used to determine their 1-repetition maximum
(1-RM) parallel back squat. Following this, subjects performed a potentiation
and a control treatment in a counterbalanced order. The potentiation treatment
culminated with subjects performing parallel back squats with a load equivalent
to 70% 1- RM for three repetitions, following which they performed one countermovement
vertical jump (CMJ) for maximal height every three minutes for a total of
10 jumps. During the control treatment, subjects performed only the CMJs.
Jump height (JH) and vertical stiffness (VStiff) were calculated for each
jump from the vertical force signal recorded from a force platform. There
were no significant changes in JH or VStiff following the treatments and
no significant differences in the responses between men and women (p >
0.05). Correlations between normalized 1-RM back squat load and the absolute
change in JH and VStiff were small to moderate for both men and women, with
most correlations being negative. Large variations in response to the back
squats were noted in both men and women. The use of resistance exercises
performed prior to a series of vertical jumps can result in improvements
in performance in certain individuals, although the gains tend to be small
and dependent upon the mechanical variable measured. There does not seem
to be any differences between men and women in the response to dynamic potentiation
protocols.
Key words: Back squats, vertical jump, potentiation, vertical stiffness. |
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