Effects of holographic bracelet on balance and muscle performance
in soccer players: A quintuple-blind, placebo-controlled, crossover randomized clinical trial
Affiliations: [a] Department of Physical Therapy, Federal University of
Ceará, Ceará, Brazil | [b] League of Sports Physical Therapy, Federal University
of Ceará, Ceará, Brazil | [c] Rehabilitation Sciences, University Center Augusto
Motta, Rio de Janeiro, Brazil
Note: [] Corrresponding author: Pedro Olavo de Paula Lima,
Laboratório de Análise do Movimento Humano, Rua Alexandre Baraúna,
949, Fortaleza, CE, 60430-110, Brazil. Tel.: +55 85 33668632; Fax: +55 85
33668002; E-mail: pedrolima@ufc.br
Abstract: This study aimed to analyze the influence of holographic bracelets
on body balance and peak torque in soccer athletes through a quintuple-blind,
placebo-controlled, crossover randomized trial. Twenty-eight male athletes were
evaluated in a stabilometric baropodometer
(DIASU®) and performed a protocol
involving concentric contractions of the knee at 60°/s.
Athletes were evaluated in three situations: no bracelet (baseline), with a
placebo bracelet (PB) and holographic bracelet (HB). Comparing the mean torque
peak at 60°/s during knee extension, there was no
statistical difference for the dominant limb (p=0.713) and
non-dominant (p=0.996) between the baseline, PB and HB
groups. No statistical difference was found comparing the mean oscillation
ellipses from the right foot with eyes open (p=0.359) and
with eyes closed (p=0.173), as well as from the left foot
with eyes open (p=0.891) and with eyes closed (p=0.778). In conclusion, holographic bracelet has no influence on
either body balance or knee muscle performance in athletes.
Keywords: Postural balance, muscle strength, soccer, holographic theory
