E-26: Free Communication/Poster – Perceived Exertion: FRIDAY, JUNE 3, 2005 9:30 AM - 12:30 PM: ROOM: Ryman C2
Recent investigation noted differences in the acute perceptual, cardiac, and hormonal responses to eccentric (ECC) and concentric (CON) contractions using an absolute resistance loading protocol. To extend this research, we investigated the same responses using similar relative resistance exercises loads.
To compare perceptual (RPE and pain), cardiac (heart rate) and endocrine (cortisol, ACTH) responses in an eccentric (ECC) and a concentric (CON) resistance training protocol using a similar workload. It was hypothesized that perceptual, cardiac, and hormonal responses would be similar.
Seven healthy males (M±SE, 25.7± 2.17y) with resistance training experience participated in the study. Two pre-experimental trials were conducted to obtain anthropometric data and a 1-RM for lateral pulldown, leg press, bench press, leg extension, seated military press, and leg curl (Master Trainer, Rayne, LA). Subjects completed two experimental trials consisting of either 65% of CON 1RM for CON contractions or 65% of CON 1RM + 20% for ECC contractions for each of the six exercises. Subjects performed 4 sets of 10 repetitions with a 90s-rest period. A blood sample was taken before, immediately after, and 15-minutes post-exercise. Omni RPE, CR-10 pain rating, and HR measures were recorded after each set.
Repeated measures ANOVAs demonstrated no between-subjects effects for Omni RPE, pain, cortisol, or ACTH. Significant interaction effects and within-subjects effects were found for RPE (p < .01), Pain (p < .01), and HR (p < .01) but not cortisol or ACTH. Specifically, OMNI RPE and pain responses were higher in the ECC condition for leg extension and leg curl, but lower in the bench press and military press.
No between subject differences were apparent for any measures except HR, supporting our hypothesis. However, RPE and pain had different ratings when comparing upper and lower body movements. These different ratings may direct research to explore interactions between interoceptive sensations and metabolic responses to different muscular movements.