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EFFECTS OF PLYOMETRIC TRAINING ON ACHILLES TENDON PROPERTIES AND SHUTTLE RUNNING DURING A SIMULATED CRICKET BATTING INNINGS

JOURNAL OF STRENGTH AND CONDITIONING RESEARCH (2013)

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JOURNAL OF STRENGTH AND CONDITIONING RESEARCH

卷 27, 期 4, 页码 1036-1046

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LIPPINCOTT WILLIAMS & WILKINS

DOI: 10.1519/JSC.0b013e3182651e7a

关键词

change of direction; cross-sectional area; jump; modulus; stiffness; stress

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Sport Sciences

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Houghton, LA, Dawson, BT, and Rubenson, J. Effects of plyometric training on achilles tendon properties and shuttle running during a simulated cricket batting innings. J Strength Cond Res 27(4): 1036-1046, 2013-The aim of this study was to determine whether intermittent shuttle running times (during a prolonged, simulated cricket batting innings) and Achilles tendon properties were affected by 8 weeks of plyometric training (PLYO, n = 7) or normal preseason (control [CON], n = 8). Turn (5-0-5-m agility) and 5-m sprint times were assessed using timing gates. Achilles tendon properties were determined using dynamometry, ultrasonography, and musculoskeletal geometry. Countermovement and squat jump heights were also assessed before and after training. Mean 5-0-5-m turn time did not significantly change in PLYO or CON (pre vs. post: 2.25 +/- 0.08 vs. 2.22 +/- 0.07 and 2.26 +/- 0.06 vs. 2.25 +/- 0.08 seconds, respectively). Mean 5-m sprint time did not significantly change in PLYO or CON (pre vs. post: 0.85 +/- 0.02 vs. 0.84 +/- 0.02 and 0.85 +/- 0.03 vs. 0.85 +/- 0.02 seconds, respectively). However, inferences from the smallest worthwhile change suggested that PLYO had a 51-72% chance of positive effects but only 6-15% chance of detrimental effects on shuttle running times. Jump heights only increased in PLYO (9.1-11.0%, p < 0.050). Achilles tendon mechanical properties (force, stiffness, elastic energy, strain, modulus) did not change in PLYO or CON. However, Achilles tendon cross-sectional area increased in PLYO (pre vs. post: 70 +/- 7 vs. 79 +/- 8 mm(2), p < 0.01) but not CON (77 6 4 vs. 77 6 5 mm(2), p > 0.050). In conclusion, plyometric training had possible benefits on intermittent shuttle running times and improved jump performance. Also, plyometric training increased tendon cross-sectional area, but further investigation is required to determine whether this translates to decreased injury risk.

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Age- and sex-related differences of muscle cross-sectional area in iliocapsularis: a cross-sectional study

Masahide Yagi, Masashi Taniguchi, Hiroshige Tateuchi, Tetsuya Hirono, Yoshihiro Fukumoto, Momoko Yamagata, Ryusuke Nakai, Yosuke Yamada, Misaka Kimura, Noriaki Ichihashi

Summary: This study used MRI to investigate the iliocapsularis muscle (IC) in healthy individuals and found that it could be identified in 85% to 95% of people. The study also revealed that the cross-sectional area (CSA) of the IC is only associated with sex and not age. However, the CSA of other lower-limb muscles was found to be associated with both sex and age.

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