Inclusion of Eccentric Actions on Net Caloric Cost Resulting From Isoinertial Resistance Exercise

Abstract

Net O 2 uptake was measured from maximal-effort 3-set, 8repetition seated leg press protocols on an isoinertial ergometer. Subjects (25 women, 9 men) did 2 workouts each exerting concentric-eccentric (CE) and concentric-only (CO) knee extensor forces to measure work and net caloric cost. Significant (p Ͻ 0.05) relationships between work and net caloric cost resulted from CE and CO workouts for the male, female, and total subject sample. Two-way repeated-measures analyses of variance showed CE workouts resulted in significantly higher work but not net caloric cost and values. CE workouts likely relied on the knee extensors series elastic element to perform an additional ϳ3,600 J of eccentric work at no additional net caloric cost. Unlike other exercise modes, maximal-effort eccentric actions on the isoinertial ergometer, as done in the current study, provide no additional net caloric cost and is thus safe to administer to populations in whom metabolic cost is a concern. . Inclusion of eccentric actions on net caloric cost resulting from isoinertial resistance exercise.

Blood Lactate and Hormonal Responses to Prototype Flywheel Ergometer Workouts

“…Despite similar CE3 and CO6 TW values, only the latter yielded higher [C] than CO3, which suggests eccentric actions blunt [C]. Prior work shows a lower metabolic cost from eccentric actions (9,13). Perhaps [C] changes from eccentric actions are dictated by metabolic factors in addition to TW.…”

“…Metabolism research showed eccentric actions evoked 1/7th the net energy cost of muscle shortening from leg presses done on standard equipment (13). In a similar fashion, eccentric FERG leg press actions added no net caloric cost beyond that from concentric exercise (9). It was concluded the CE3 protocol uses stored elastic energy to evoke muscle potentiation and stretch reflexes with eccentric FERG actions (9).…”

“…In a similar fashion, eccentric FERG leg press actions added no net caloric cost beyond that from concentric exercise (9). It was concluded the CE3 protocol uses stored elastic energy to evoke muscle potentiation and stretch reflexes with eccentric FERG actions (9). Future research on the impact of eccentric actions on metabolism and [C] is warranted.…”

“…The merits of FERG workouts were assessed in ambulatory and ground-based microgravity simulation models (7)(8)(9)(10). In addition, the FERG was examined for its utility in Earthbound applications, such as to abate musculoskeletal losses in the elderly (6).…”

Net Energy Expenditure of Gravity-Independent High-Speed Resistive Exercise Done by Women

“…A similar seated leg press study was then conducted with a fl ywheel ergometer, specifi cally designed for use as in-fl ight hardware ( 5 ). The radii of the fl ywheels imposed a large inertial load that enabled performance of low-speed high-resistance repetitions, in contrast to the manner muscle actions are performed on the Impulse.…”