Author(s): GUO, Z., HE, C.S., WANG, H.H., Institution: NATIONAL CHUNG CHENG UNIVERSITY, Country: TAIWAN, Abstract-ID: 1128

INTRODUCTION:
Whole-body vibration (WBV) has been proposed as an acute neuromuscular stimulus that may transiently enhance explosive performance. However, the additive value of integrating WBV into a dynamic warm-up (DW) and its short-term effects remain unclear. This study compared the effects of DW alone versus DW combined with WBV (DW+WBV) on reactive strength index (RSI), rate of force development (RFD), and countermovement jump (CMJ) height in healthy young females.
METHODS:
Ten healthy females (age 22.4 ± 1.5 years; body mass 58.6 ± 8.7 kg; height 167.1 ± 6.4 cm) completed two sessions in a counterbalanced crossover design (squat-based warm-up vs. squat-based warm-up plus WBV), separated by ≥48 h, and abstained from caffeine for 24 h prior to each visit. Following vertical jump familiarization and baseline countermovement jump (CMJ) assessment, participants performed either the squat-based warm-up alone or the same warm-up combined with WBV (30 Hz, 1.9 mm, 2 min). Force–time data were acquired using a force plate (Kistler 9260AA, 1000 Hz) at 0, 5, 10, and 15 min post-warm-up (T0, T5, T10, T15), from which the reactive strength index (RSI), rate of force development (RFD), and CMJ height were derived. Outcomes were analyzed using a two-way repeated-measures ANOVA (condition × time; α = 0.05).
RESULTS:
Results: No significant condition × time interactions were observed for RSI, RFD, or JH (all p > 0.05), indicating that adding WBV did not alter the pattern of performance changes across the 0–15 min post-warm-up period. Significant main effects of condition were found for RSI (p = 0.02) and JH (p = 0.05), with overall higher values in DW+WBV than in DW, whereas RFD showed a trend toward a condition effect (p = 0.06). Regarding main effects of time, RSI and RFD were not significant (both p > 0.05), while JH showed a significant time effect (p < 0.05).
CONCLUSION:
Incorporating WBV into DW enhanced overall performance. Compared with DW alone, DW+WBV elicited significantly greater RSI and CMJ jump height, with RFD showing an improving trend. Notably, the absence of a condition × time interaction indicates that the benefits of WBV are more likely expressed as a stable, overarching advantage during the early post-warm-up period, rather than as a pronounced peak at a specific time point.