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ERIC Number: EJ840505
Record Type: Journal
Publication Date: 2008-Mar
Pages: 9
Abstractor: As Provided
ISBN: N/A
ISSN: ISSN-0270-1367
Influence of a Horizontal Approach on the Mechanical Output during Drop Jumps
Ruan, Mianfang; Li, Li
Research Quarterly for Exercise and Sport, v79 n1 p1-9 Mar 2008
This study investigated the influence of a horizontal approach to mechanical output during drop jumps. Participants performed drop jumps from heights of 15, 30, 45, and 60 cm with zero, one, two, and three approach steps. The peak summed power during the push-off phase changed quadratically across heights (6.2 [plus or minus] 0.3, 6.7 [plus or minus] 0.4, 6.4 [plus or minus] 0.4, and 6.0 [plus or minus] 0.4 kW, respectively) driven by the ankle joint response. Summed peak power was 10% greater with an approach attributed to the knee joint response. Downward phase dorsiflexion (31%), knee flexion (35%), and peak vertical force (32%) increased with drop heights. Vertical approach force (22%) increased, while knee flexion (11%) and downward duration (17%) decreased. An approach may improve drop jump training for explosive tasks. (Contains 7 tables and 4 figures.)
American Alliance for Health, Physical Education, Recreation and Dance. 1900 Association Drive, Reston, VA 20191. Tel: 800-213-7193; Fax: 703-476-9527; e-mail: info@aahperd.org; Web site: http://www.aahperd.org
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A