Jumping Performance is Preserved but Not Muscle Thickness in Collegiate Volleyball Players After a Taper

Abstract

Bazyler, CD, Mizuguchi, S, Sole, CJ, Suchomel, TJ, Sato, K, Kavanaugh, AA, DeWeese, BH, and Stone, MH. Jumping performance is preserved but not muscle thickness in collegiate volleyball players after a taper. J Strength Cond Res 32(4): 1020-1028, 2018-The purpose of this study was to examine changes in muscle architecture and jumping performance in NCAA division I women's volleyball players throughout a competitive season and in preparation for conference championships. Ten women volleyball players were tested at preseason (T1), pretaper (T2), and post-taper (T3) on measures of vastus lateralis muscle thickness (MT), pennation angle (PA) and fascicle length (FL) using ultrasonography, and unloaded and loaded squat jump height (SJH) and peak power allometrically scaled to body mass (SJPPa) on a force platform. Rating of perceived exertion training load and strength training volume load were monitored weekly. Player's MT (p < 0.001, Glass's Δ = 2.8) and PA increased (p = 0.02, Δ = 3.9) after in-season training. However, MT decreased after the taper (p = 0.01, Δ = 0.6) but remained elevated above preseason values (p < 0.001, Δ = 1.7). There were no statistical changes in FL, SJH, or SJPPa. Large-to-very large negative relationships (r = -0.51 to -0.81) were observed between preseason relative maximal strength and changes in SJH and SJPPa with various loads over the season. These findings demonstrate that relatively low volumes of strength training and concurrent sport training during a tapering period are capable of preserving jumping performance, but not MT in women's volleyball players; however, jumping performance changes seem to be related to the player's strength level. Stronger players may benefit from an overreaching microcycle before the taper to preserve previously accrued muscular adaptations and jumping performance.

Identifying a Test to Monitor Weightlifting Performance in Competitive Male and Female Weightlifters

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Comparison of the Relationship between Lying and Standing Ultrasonography Measures of Muscle Morphology with Isometric and Dynamic Force Production Capabilities

“…A location half the distance between the greater trochanter and lateral epicondyle of the right femur was identified and marked. A distance 5 cm medial to the mid-femur marking was also identified and marked [ 9 , 18 ]. This medial marking was used for the measurement of MT.…”

“…A straight-edge was placed along the skin to ensure that the probe remained along the previously established midline. Three images were obtained and saved for subsequent analysis using the software provided within the ultrasonography device [ 10 , 18 ].…”

“…Consistent with CSA measurement, three images were captured and saved for subsequent analysis to determine lying muscle thickness (LMT) and lying pennation angle (LPA). Analysis was performed using the software provided within the ultrasonography device [ 10 , 18 ].…”

Análise da força de mordida, atividade eletromiográfica e espessura dos músculos masseter e temporal em nadadores de elite - modalidade Crawl

“…Takahashi (2006) A análise da morfologia muscular por meio da ultrassonografia cinesiológica é uma técnica importante para determinar a função e morfologia do sistema estomatognático por ser baseada em medidas precisas em tempo real da largura transversal do músculo (Palinkas et al, 2010). Esta técnica é considerada padrão ouro na visualização de parâmetros musculares e de boa reprodutibilidade, baixo custo, portabilidade e por não ser uma técnica invasiva que venha a oferecer riscos aos indivíduos durante sua execução (Castelo et al, 2006;Wiesinger et al, 2016;Bazyler et al, 2017;Mourtzakis et al, 2017;Wiesinger et al, 2017).…”