Banca de DEFESA: GABRIELA LIMA RIBEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GABRIELA LIMA RIBEIRO
DATE: 29/11/2023
TIME: 16:00
LOCAL: FEF/ UnB - Sala 42
TITLE:

DETERMINATION OF THE BILATERAL INDEX IN VERTICAL JUMP: REPRODUCIBILITY, SIGNAL-TO-NOISE RATIO, AND RELATIONSHIP WITH PERFORMANCE METRICS

KEY WORDS:

Physical fitness; neuromuscular function; countermovement jump; unilateral jump; single-leg jump.

PAGES: 50
BIG AREA: Ciências da Saúde
AREA: Educação Física
SUMMARY:

INTRODUCTION. The countermovement jump (CMJ) is one of the most popular tests
due to its practical and highly informative nature, as it provides dozens of metrics. The
metrics obtained with the CMJ enable performance assessments and the monitoring of
levels of fatigue and readiness for physical exercise. One less explored metric of CMJ is
the bilateral index (BI). The BI requires the combination of metrics obtained from a
bilateral CMJ and unilateral CMJs to be performed with the right leg (RL) and left leg
(LL). It is suggested that the BI is capable of providing information on neuromuscular
capacity and performance in sports. However, we can speculate that the combination of
metrics based on three tests (BI, RL, and LL) makes this metric susceptible to errors of
great magnitude. OBJECTIVES. This dissertation’s main objective was to compare the
bilateral force index (BFI) and the bilateral impulse index (BII) in physically active young
men. Other objectives were to investigate the reproducibility and the signal-to-noise
ratio (SNR), as well as exploring the correlations between the bilateral CMJ’s indexes
and performance metrics. MATERIALS AND METHODS. Thirty-nine physically active
men (24 ± 4 years old) performed 12 CMJs (4 of each type: BI, RL, and LL) on a force
plate, on three separate days, from 48 to 168 hours apart. The BFI and the BII were
established based on the average propulsive forces (force) and the net propulsive
impulses (impulse) produced in the jumps. Reproducibility and SNR were established
intra and interday. We investigated the possible correlations between the CMJ indexes
and performance metrics (i.e. jump height, modified reactive force index, take-off
velocity and momentum, and duration of movement) using the Pearson product moment
correlation. RESULTS. In terms of magnitude, we identified BFI higher than BII (36
against 22%, p<0.001, SE = 3.3). In the intraday analysis, we observed low
reproducibility of the BFI, which was reflected in an inadequate SNR, while the BII
demonstrated an acceptable SNR on the third testing day. However, in the interday
analysis, both indexes were considered inadequate in all combinations on the three
testing days. Finally, we observed a “strong” correlation (r = 0.58) between the BII and
take-off momentum, but we did not identify other correlations between the CMJ indexes
and performance metrics. CONCLUSION. Though the BFI has a higher magnitude than
the BII, only the BII showed an acceptable SNR on the third testing day, as well as a
strong correlation with take-off momentum. However, neither BII nor BFI showed
acceptable interday SNR, which can longitudinally compromise the monitoring of these
indexes.

COMMITTEE MEMBERS:
Presidente - 1299793 - AMILTON VIEIRA
Interno - 2101604 - LAURO CASQUEIRO VIANNA
Externo ao Programa - 2345988 - VICTOR LAGE - UnBExterno à Instituição - RAFAEL LIMA KONS - UFBA