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International Journal of Exercise Science 16(6): 538-549, 2023. The primary purpose of this study was to evaluate acute dose response of different intensities with total volume equalized during the abdominal crunch exercise on muscle thickness, echo-intensity, peak force, time under tension, total load lifted, and perception of effort in recreationally-trained participants. Fifteen resistance-trained participants (23 ± 3 years) performed the abdominal crunch exercise in one of two different resistance training (RT) protocols in a randomized order: RT4x10RM (4 sets of 10RM / 1-min rest) or RT1x40RM (1 set of 40RM). Muscle thickness (MT), echo- intensity (EI), peak force (PF), time under tension (TUT), total load lifted (TLL), and session rating of perceived exertion (sRPE) were measured pre-test and post-test (0-min and 15-min). Two-way repeated-measures ANOVAs (2 x 3) were used to test differences between RT protocols (RT4x10RM and RT1x40RM) and time (pre-test, post-0, and post-15) for MT, EI, and PF. Paired t-test was used to compare RT protocols for sRPE, TLL, and TUT. For MT, there were significant differences for RT4x10RM between pre- x post-0 (p = 0.011), pre- x post-15 (p < 0.001), and post-0 x post-15 (p = 0.02); and for RT1x40RM between pre- x post-0 (p < 0.001) and pre- x post-15 (p = 0.003). For EI, there was a significant difference for RT4x10RM between pre- x post-0 (p = 0.002). For sRPE, there was no significant difference between RT protocols. For TLL and TUT, there were significant differences between RT protocols (p < 0.05). In conclusion, both RT protocols (RT4x10RM and RT1x40RM) induced similar increases in MT but not for EI. TLL and TUT were higher for RT4x10RM. PF and sRPE were similar between RT protocols.
Sullivan, Keanna; Ferreira, Paula R.; Martinez, Vincent G.F.; and Marchetti, Paulo Henrique
"Muscle Thickness, Echo-Intensity, Peak Force, Time Under Tension, Total Load Lifted, and Perception of Effort Comparisons Between Two Abdominal Crunch Resistance Training Protocols in Recreationally-Trained Participants,"
International Journal of Exercise Science: Vol. 16
6, Pages 538 - 549.
Available at: https://digitalcommons.wku.edu/ijes/vol16/iss6/8