Searching for just a few words should be enough to get started. If you need to make more complex queries, use the tips below to guide you.
Article type: Research Article
Authors: Parmar, Prashantb | Perry, Rachela | Martin, Jakec | Vickers, Samanthaa | Baptista, Rachela | Edwards, Romana | McArtor, Jona | Mitchell, Laceya | Caruso, Johna; *
Affiliations: [a] Exercise and Sports Science Program, The University of Tulsa, Tulsa, OK, USA | [b] The University of Oklahoma College of Medicine, Tulsa, OK, USA | [c] Department of Chemistry and Biochemistry, The University of Tulsa, Tulsa, OK, USA
Correspondence: [*] Corresponding author: John Caruso, 800 S. Tucker Drive, Tulsa, OK 74104, USA. Tel.: +1 918 631 2924; Fax: +1 918 631 2068; E-mail:john-caruso@utulsa.edu
Abstract: BACKGROUND: To limit physiological changes incurred with space flight, exercise hardware should impart sufficient mechanical loads with minimal energy costs. OBJECTIVE: Assess net energy costs from exercise done on flywheel-based hardware. METHODS: Subjects (17 men, 19 women) performed the following leg press workouts in a randomized sequence: two sets of concentric-only (CO2) actions, two sets with both concentric and eccentric (CE2) activity, and four sets of concentric-only (CO4) actions. Workouts entailed 8-repetition sets with 90-second rest periods. O2 was measured before, during and after workouts to calculate net energy costs. Total work (TW) was derived from flywheel rotation rates as follows: TW = (1/2)(J)(ω 2) whereby J = rotation inertia and ω = angular velocity. TW and net energy costs were assessed with 2(gender) × 3(workout) ANOVAs with repeated measures for workout. RESULTS: TW had significant differences by gender (men > women) and workout (CE2, CO4 > CO2). Net energy costs also yielded significant differences by gender (men > women) and workout (CO4 > CE2, CO2). CONCLUSIONS: For the CE2 workout ∼ 50% of the TW occurred through muscle lengthening. Eccentric actions should be part of workouts done on this hardware, as they impart large mechanical loads with little net energy cost.
Keywords: Metabolism, eccentric, muscle lengthening, mechanical loading
DOI: 10.3233/IES-150597
Journal: Isokinetics and Exercise Science, vol. 23, no. 4, pp. 221-227, 2015
IOS Press, Inc.
6751 Tepper Drive
Clifton, VA 20124
USA
Tel: +1 703 830 6300
Fax: +1 703 830 2300
sales@iospress.com
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
IOS Press
Nieuwe Hemweg 6B
1013 BG Amsterdam
The Netherlands
Tel: +31 20 688 3355
Fax: +31 20 687 0091
info@iospress.nl
For editorial issues, permissions, book requests, submissions and proceedings, contact the Amsterdam office info@iospress.nl
Inspirees International (China Office)
Ciyunsi Beili 207(CapitaLand), Bld 1, 7-901
100025, Beijing
China
Free service line: 400 661 8717
Fax: +86 10 8446 7947
china@iospress.cn
For editorial issues, like the status of your submitted paper or proposals, write to editorial@iospress.nl
如果您在出版方面需要帮助或有任何建, 件至: editorial@iospress.nl