THE EFFECTS OF TRAINING STATUS AND RECOVERY TIME ON THE RECONSTITUTION OF IMPULSE ABOVE CRITICAL TORQUE
Kristina Woodford, Ryann Shepherd, Claire Nagel, Elise Hodges, Rebecca Larson and Christopher Black
University of Oklahoma, Norman, OK
Critical torque (CT) provides a framework for understanding the typical exercise induced reduction in force as it theoretically represents the maximal torque output that can be sustained for a long duration. Impulse above critical torque (IACT; the isometric analog to W’) represents a fixed amount of work that can be performed above CT. The role of aerobic training status and rest periods on the recovery of force and its role in the reconstitution of IACT is unknown. PURPOSE: The purpose of this study was to examine the time-course of the reconstitution of IACT following its depletion during electrically evoked isometric exercise. METHODS: Twenty-six participants (10 trained, 16 untrained; VO2Peak (ml•kg-1•min-1): 54.3 ± 6.8 vs. 38.0 ± 5.6, Age (years): 25.5 ± 4.7 vs. 25.7 ± 5.3, respectively) completed 4 bouts of electrically stimulated exercise at 100 Hz, consisting of 75 contractions using a 2-sec:2-sec on/off duty cycle of the knee extensors. CT was determined as the mean torque of the final 6 contractions and IACT was calculated as the sum of the area under the torque-time curve above CT across all contractions. A rest period of 5 or 15 minutes was randomly assigned followed by a second round of electrically stimulated exercise. RESULTS: A mixed methods ANOVA revealed the three-way interaction among rest period (5-min vs. 15-min), exercise bout (1st or second on that day), and training status was not significant (p=0.79). There were also no significant 2-way interactions between rest period, bout, or training status (p ≥ 0.75). A significant (p < 0.001) main effect for exercise bout was found with IACT values from bout 2 being reduced (~21%) compared to round 1 (784.2 ± 524.9 Nm•s vs. 663.0 ± 444.4 Nm•s for round 1 and round 2, respectively). No differences between rest periods or training status were observed (p ≥ 0.51). CONCLUSION: The findings of this study are in contrast with previous studies which found that additional rest and higher aerobic training status lead to faster recovery of W’/IACT.
Woodford, K; Shepherd, R; Nagel, C; Hodges, E; Larson, R; and Black, C
"THE EFFECTS OF TRAINING STATUS AND RECOVERY TIME ON THE RECONSTITUTION OF IMPULSE ABOVE CRITICAL TORQUE,"
International Journal of Exercise Science: Conference Proceedings: Vol. 11:
10, Article 42.
Available at: https://digitalcommons.wku.edu/ijesab/vol11/iss10/42