The effects of long duration eccentric or concentric contraction on neuromuscular function in young males / by Todd J. Brown.
| Author/creator | Brown, Todd J. author. |
| Other author | Hortobágyi, Tibor, degree supervisor. |
| Other author | East Carolina University. Department of Exercise and Sport Science. |
| Format | Theses and dissertations |
| Production | 2003. |
| Description | 99 leaves : illustrations, forms ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Summary | Even though mechanical loading is a key stimulus for muscle strength and hypertrophy, anecdotal observations suggest that contraction duration may also play a role in strength gains. The purpose of this study was to examine the physiological adaptations to long-duration concentric and eccentric contractions. Previously resistance trained males were randomly assigned to a long-duration concentric (2-1-8 s, N=6) or eccentric group (8-1-2 s, N=6) and performed 2 sets of 8 reps with 70% of 1-RM for 16 training sessions. Controls did not train (N=5). All subjects were tested for 1-RM (pounds), muscular endurance (i.e., number of repetitions at an absolute load), oxygen consumption (V02, L/min), and hormone concentrations (testosterone. cortisone, and lactate) in one session of each contraction type, using a horizontal Cybex leg press machine. The Group by Time interactions were not significant (p < 0.05) but there was a significant time main effect for both training groups for the 1-RM bench press, absolute endurance, oxygen consumption, cortisone and lactate concentrations (p<0.05). These preliminary results suggest that both training modes produce adaptations in muscular strength, endurance and hormone stimulation at similar metabolic cost in previously trained subjects. Contraction duration could be used as a supplemental loading to elicit strength adaptations in previously trained males. Supported by NIA Grant AG16192 |
| General note | Presented to the faculty of the Department of Exercise and Sport Science. |
| General note | Advisor: Tibor Hortobagyi |
| Dissertation note | M.A. East Carolina University 2003 |
| Bibliography note | Includes bibliographical references (leaves 55-59). |
| Genre/form | theses. |
| Genre/form | dissertations. |
| Genre/form | doctoral dissertations. |
| Genre/form | masters theses. |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |