DIFFERENCES IN FORCE CHARACTERISTICS DURING CLEAN PERFORMANCE AFTER THE IMPLEMENTATION OF EITHER A HIGH-VELOCITY OR HIGH-FORCE STRENGTH INTERVENTION
Author
WALKER, OWEN
Date
2013Type
Thesis
Publisher
Cardiff Metropolitan University
Metadata
Show full item recordAbstract
The contractile history of skeletal muscle has been repeatedly demonstrated to
harvest an acute enhancement in its subsequent contractile capacity. However, to
date no investigations have explored the effects of a pre-stimulus contraction upon
the performance of the power clean (PC). Therefore, the purpose of this present
study was to investigate the effects of a high-velocity (HV) and high-force (HF)
pre-stimulus contraction upon subsequent PC performance. Ten competitive male
rugby players (mean ± SD: age 20.6 ± 1.43 years, body mass 94.0 ± 14.36 kg,
height 179.9 ± 7.5 cm, training age 2.6 ± 0.66 years, clean 1RM 99.0 ± 15.78 kg)
performed a baseline (BS) measure of PC performance at 80% of 1RM. Each
participant then performed a mid-thigh clean pull (MTCP) at 30% of PC 1-
repetition maximum (HV) and a MTCP at 120% of PC 1-repetition maximum (HF)
5-minutes prior to the subsequent PC performance in a randomised and
counterbalanced order. Peak force (FP), time to peak force (TFP), peak rate of
force development (PRFD), and time to peak rate of force development (TPRFD)
were assessed using a portable AMTI force platform (AMTI, USA). The results
reported that no significant effects were observed for FP (p > 0.05), TFP (p >
0.05), PRFD (p > 0.05), and TPRFD (p > 0.05) during the HV intervention when
compared to BS. Likewise, no significant differences were revealed in FP (p >
0.05), TFP (p > 0.05), PRFD (p > 0.05), and TPRFD (p > 0.05) during the HF
intervention when compared to BS. Consequently, it appears that the use of a prestimulus
MTCP has no significant effect upon the force characteristics of a
preceding PC performance in male collegiate rugby players. However, due to the
highly individualised nature of PAP, these results should prompt further research
on divergent populations. From the findings of this research, strength and
conditioning professionals can appreciate that whilst the MTCP may not evoke any
potentiation upon subsequent PC performance; there is no evidence to suggest it
has a negative impact.
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