The correct choice of the acute variables is another important component of a resistance training (RT) session. The combination of intensity and volume is fundamental to determine the dose-response in a RT session and can induce specific metabolic and mechanical stress in the muscle. PURPOSE: The primary purpose of this study was to evaluate acute dose-response of different volume x intensity RT protocols with equated total volume (40 repetitions) during the crunch exercise on muscle thickness, echo-intensity, load lifted, and rating of perceived exertion in recreationally-trained participants. METHODS: Fifteen resistance-trained participants (23±3years, 76.4±6.5kg, 173.3±6.5cm) performed the abdominal crunch exercise in one of two different RT protocols with equated total volume (40 repetitions) in a randomized order: RT4x10RM (4 sets of 10RM/1-min rest) or RT1x40RM (1 set of 40RM). Muscle thickness (MT), echo intensity (EI), total load lifted (TLL), and rating of perceived exertion (RPE) were measured pre-test and post-test (0-min and 15-min). Two-way repeated-measures ANOVAs (2x3) were used to test differences between RT protocols (RT4x10RM and RT1x40RM) and time (pre-test, post-0, and post-15) for MT and EI. Paired t-test was used to compare differences between RT protocols for RPE and TLL. RESULTS: 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). There were significant differences for RT1x40RM between pre- x post-0 (p<0.001) and pre- x post-15 (p=0.003). For EI, there was significant difference for RT4x10RM between pre- x post-0 (p=0.002). For RPE, there was no significant difference between RT protocols. For TLL, there were significant differences between RT protocols (p=0.04). CONCLUSION: Both RT protocols (RT4x10RM and RT1x40RM) induced similar increases in MT and EI. RPE and TLL were higher for the RT4x10RM protocol.
Sullivan, Keanna J. and Marchetti, Paulo H.
"Different Resistance Training Protocols During the Crunch Exercise Affect Muscle Thickness, Echo-Intensity, Load Lifted, and Perception of Effort in Recreationally-Trained Participants.,"
International Journal of Exercise Science: Conference Proceedings: Vol. 14:
2, Article 177.
Available at: https://digitalcommons.wku.edu/ijesab/vol14/iss2/177