Student Major/Year in School
Kinesiology, third year
Faculty Mentor Information
Andrew, M. Alexander and Thomas J. Barstow, Kinesiology, Kansas State University
Abstract
Recent findings from our laboratory suggest that recovery from peripheral fatigue measured by pre- and post-potentiated twitch forces following extreme intensity (80%) exercise is faster than following severe intensity exercise (40% MVC). Women have been shown to have predominately higher percentages of slow twitch muscle fibers compared to men. Purpose: To test the hypothesis that Qtw (potentiated twitch) following exercise is recovered faster in women in both exercise intensities. Methods: 6 subjects (3 men, 3 woman, age 24 ± 4 yrs, 74.5 ± 17.4 kg; 173 ± 5 cm) performed 2 intermittent isometric knee extension tests to exhaustion at 40% and 80% MVC. Repetitions were performed at a 60% duty cycle (3s on, 2s off). Exercise intensities were chosen to elicit time to task failure (Tlim) in < 2min (extreme intensity) and 2-15 min (severe intensity). Task failure was defined as the inability to maintain target force of MVC (40%, 80%). Qtw (potentiated twitch) measurements were made every 30s prior to and immediately following exercise. Qtw was compared pre- and post-exercise between intensity. Furthermore, individual Qtw were compared over time during recovery following extreme and severe exercise in men and women. Results: Recovery from fatigue following severe intensity exercise shows significant decreases in force production in men and women compared to baseline values: * significantly different from baseline value. Significant decreases in all six force production values following extreme intensity exercise were found in men, while women showed only initial value to be significantly different. Recovery from fatigue in women after the first 30 second measurement increased to near baseline value where the difference in force production was no longer significant. Conclusion: No significant difference in recovery in men and women following severe intensity exercise was found. There where significant differences from recovery in men compared to women following extreme intensity exercise. Force production in women 30 seconds into recovery indicated recovery was significant compared to men.
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
Recommended Citation
Erives, Cristian (2019). "Sex Differences in Exercise Recovery," Kansas State University Undergraduate Research Conference. https://newprairiepress.org/ksuugradresearch/2019/posters/22
Sex Differences in Exercise Recovery
Recent findings from our laboratory suggest that recovery from peripheral fatigue measured by pre- and post-potentiated twitch forces following extreme intensity (80%) exercise is faster than following severe intensity exercise (40% MVC). Women have been shown to have predominately higher percentages of slow twitch muscle fibers compared to men. Purpose: To test the hypothesis that Qtw (potentiated twitch) following exercise is recovered faster in women in both exercise intensities. Methods: 6 subjects (3 men, 3 woman, age 24 ± 4 yrs, 74.5 ± 17.4 kg; 173 ± 5 cm) performed 2 intermittent isometric knee extension tests to exhaustion at 40% and 80% MVC. Repetitions were performed at a 60% duty cycle (3s on, 2s off). Exercise intensities were chosen to elicit time to task failure (Tlim) in < 2min (extreme intensity) and 2-15 min (severe intensity). Task failure was defined as the inability to maintain target force of MVC (40%, 80%). Qtw (potentiated twitch) measurements were made every 30s prior to and immediately following exercise. Qtw was compared pre- and post-exercise between intensity. Furthermore, individual Qtw were compared over time during recovery following extreme and severe exercise in men and women. Results: Recovery from fatigue following severe intensity exercise shows significant decreases in force production in men and women compared to baseline values: * significantly different from baseline value. Significant decreases in all six force production values following extreme intensity exercise were found in men, while women showed only initial value to be significantly different. Recovery from fatigue in women after the first 30 second measurement increased to near baseline value where the difference in force production was no longer significant. Conclusion: No significant difference in recovery in men and women following severe intensity exercise was found. There where significant differences from recovery in men compared to women following extreme intensity exercise. Force production in women 30 seconds into recovery indicated recovery was significant compared to men.
