Thomasson, ML and Comfort, P
'Occurrence of fatigue during sets of static squat jumps at a variety of loads'
, Journal of Strength and Conditioning Research, 26 (3)
, pp. 677-683.
Thomasson, ML and Comfort, P. Occurrence of fatigue during
sets of static squat jumps performed at a variety of loads.
J Strength Cond Res 26(3): 677–683, 2012—Research has
identiﬁed that the optimal power load for static squat jumps
(with no countermovement) is lower than the loads usually
recommended for power training. Lower loads may permit the
performance of additional repetitions before the onset of
fatigue compared with heavier loads; therefore, the aim of this
study was to determine the point of fatigue during squat jumps
at various loads (0, 20, 40, 60% 1-repetition maximum [1RM]).
Seventeen professional rugby league players performed sets
of 6 squat jumps (with no countermovement), using 4 loading
conditions (0, 20, 40, and 60% of 1RM back squat). Repeated
measures analysis of variance revealed no signiﬁcant differences (p . 0.05) in force, velocity, power, and displacement
between repetitions, for the 0, 20, and 40% loading conditions. The 60% condition showed no signiﬁcant difference
(p . 0.05) in peak force between repetitions; however,
velocity (1.12 + 0.10 and 1.18 + 0.11 m�s21
), power (3,385 +
343 and 3,617 + 396 W) and displacement (11.13 + 2.31
and 11.85 + 2.16 cm) were signiﬁcantly (p , 0.02) lower
during repetition 6 compared with repetition 2. These ﬁndings
indicate that when performing squat jumps (with no countermovement) with a load ,40% 1RM back squat, up to .6
repetitions can be completed without inducing fatigue and
a minimum of 4–6 repetitions should be performed to achieve
peak power output. When performing squat jumps (with no
countermovement) with a load equal to the 60% 1RM only,
5 repetitions should be performed to minimize fatigue and
ensure maintenance of velocity and power.
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