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Article type: Research Article
Authors: Lee, Mikyunga | Kim, Soohyuna | Choi, Hyun-Minb | Park, Jihonga; *
Affiliations: [a] Athletic Training Laboratory, Department of Sports Medicine, Kyung Hee University, Gyeonggi, Korea | [b] Graduate School of Physical Education, Kyung Hee University, Gyeonggi, Korea
Correspondence: [*] Corresponding author: Jihong Park, Athletic Training Laboratory, Department of Sports Medicine, Kyung Hee University, 1732 Deogyeong-daero, Giheung, Yongin, Gyeonggi 446701, Korea. Tel.: +82 31 201 2721; Fax: +82 31 204 8117; E-mail:jihong.park@khu.ac.kr
Abstract: BACKGROUND: Ankle or knee joint cooling has shown to increase muscle activation in controlled laboratory measurements. OBJECTIVE: To examine if a bilateral 20-min lower-extremity joint cooling alters maximal vertical jump heights over time. METHODS: Twenty-one healthy male basketball and volleyball players participated in this cross over study. One of three conditions was assigned for each session (ankle or knee joint cooling, or control). Subjects performed three maximal vertical jumps with (countermovement jump: CMJ) and without (squat jump: SJ) using muscle pre-stretching and arm swinging at baseline and after condition (0-, 10-, 20-, and 30-min post). To test joint cooling effects over time, we performed 3 × 5 mixed model ANOVAs and Tukey-Kramer tests. RESULTS: Both joint cooling altered CMJ heights (F8,280 = 2.29; p= 0.02). Compared to the baseline measurements, subjects jumped lower after condition (ankle: 4.3 cm; knee: 3.5 cm, p < 0.0001) but their jump heights returned to the baseline levels after 10-min post-joint cooling (p > 0.16). SJ heights did not change at any time interval (F8,280 = 1.67; p = 0.11). CONCLUSIONS: Bilateral joint cooling does not produce a facilitatory effect during a high-intensity dynamic movement. Cryotherapy at the lower extremity joints should be done ten minutes before games or practices to avoid a performance deficit in vertical jump heights.
Keywords: Cryotherapy, vertical jump, Vertec
DOI: 10.3233/IES-160626
Journal: Isokinetics and Exercise Science, vol. 25, no. 1, pp. 1-8, 2017
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