TY - JOUR
T1 - Focal vibration of quadriceps muscle enhances leg power and decreases knee joint laxity in female volleyball players
AU - Filippi, Guido Maria
AU - 33184,
AU - FACOLTA', DI MEDICINA E CHIRURGIA "A.GEMELLI"
AU - Neuroscienze, ROMA - Dipartimento di
AU - Brunetti, O
AU - Botti, Fm
AU - Roscini, M
AU - Brunetti, A
AU - Biscarini, A
AU - Pettorossi, Ve
PY - 2012
Y1 - 2012
N2 - AIM: This double-blind randomized controlled study aims at determining the effect of repeated muscle vibration (rMV) on explosive and reactive leg power and on knee laxity of female volleyball players.
METHODS:
Eighteen voluntary volleyball athletes, belonging to the same senior regional level team (age=22.7±3 years, height=180.3 ± 5 cm, mass=64±4 kg) were assigned to three groups (N.=6) for vibration on contracted quadriceps (VC), vibration on relaxed muscle (VR), and sham vibration (NV), respectively. Intervention consisted in 3 rMV sessions performed in 3 consecutive days. In each session, 100Hz, 300-500 μm amplitude vibratory stimuli were bilaterally delivered to the quadriceps in three consecutive 10-minutes applications. Explosive and reactive leg power and knee joint laxity were evaluated 1 day before, and 1, 30, and 240 days after intervention.
RESULTS:
In VC group, explosive and reactive leg power increased respectively by ~16% and ~9% at 1 day, by ~19% and ~11% at 30 days and by ~26% and ~13% at 240 days, concomitantly knee laxity decreased by ~6%, ~15% and ~18% at the same times. These changes were significantly larger than in the other groups, in which leg power increment and knee joint laxity reduction remained close to ~3%, ~5% and ~10% at 1, 30 and 240 days, respectively.
CONCLUSION:
Combined bilateral voluntary contraction and rMV of the quadriceps muscles is a short-lasting, non-invasive technique that can significantly and persistently improve muscle performance and knee laxity in volleyball women players.
AB - AIM: This double-blind randomized controlled study aims at determining the effect of repeated muscle vibration (rMV) on explosive and reactive leg power and on knee laxity of female volleyball players.
METHODS:
Eighteen voluntary volleyball athletes, belonging to the same senior regional level team (age=22.7±3 years, height=180.3 ± 5 cm, mass=64±4 kg) were assigned to three groups (N.=6) for vibration on contracted quadriceps (VC), vibration on relaxed muscle (VR), and sham vibration (NV), respectively. Intervention consisted in 3 rMV sessions performed in 3 consecutive days. In each session, 100Hz, 300-500 μm amplitude vibratory stimuli were bilaterally delivered to the quadriceps in three consecutive 10-minutes applications. Explosive and reactive leg power and knee joint laxity were evaluated 1 day before, and 1, 30, and 240 days after intervention.
RESULTS:
In VC group, explosive and reactive leg power increased respectively by ~16% and ~9% at 1 day, by ~19% and ~11% at 30 days and by ~26% and ~13% at 240 days, concomitantly knee laxity decreased by ~6%, ~15% and ~18% at the same times. These changes were significantly larger than in the other groups, in which leg power increment and knee joint laxity reduction remained close to ~3%, ~5% and ~10% at 1, 30 and 240 days, respectively.
CONCLUSION:
Combined bilateral voluntary contraction and rMV of the quadriceps muscles is a short-lasting, non-invasive technique that can significantly and persistently improve muscle performance and knee laxity in volleyball women players.
KW - Muscle
KW - force
KW - power
KW - vibration
KW - Muscle
KW - force
KW - power
KW - vibration
UR - http://hdl.handle.net/10807/41084
M3 - Article
VL - 2012/52
SP - 596
EP - 605
JO - JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
JF - JOURNAL OF SPORTS MEDICINE AND PHYSICAL FITNESS
SN - 0022-4707
ER -