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Alexander AM, Hammer SM, Didier KD, Huckaby LM, Barstow TJ. Neuromuscular recovery from severe- and extreme-intensity exercise in men and women. Appl Physiol Nutr Metab 2022; 47:458-468. [PMID: 35020495 DOI: 10.1139/apnm-2021-0407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Maximal voluntary contraction force (MVC), potentiated twitch force (Qpot), and voluntary activation (%VA) recover to baseline within 90 s following extreme-intensity exercise. However, methodological limitations mask important recovery kinetics. We hypothesized reductions in MVC, Qpot, and %VA at task failure following extreme-intensity exercise would be less than following severe-intensity exercise, and Qpot and MVC following extreme-intensity exercise would show significant recovery within 120 s but remain depressed following severe-intensity exercise. Twelve subjects (6 men) completed 2 severe-intensity (40, 50% MVC) and 2 extreme-intensity (70, 80% MVC) isometric knee-extension exercise bouts to task failure (Tlim). Neuromuscular function was measured at baseline, Tlim, and through 150 s of recovery. Each intensity significantly reduced MVC and Qpot compared with baseline. MVC was greater at Tlim (p < 0.01) and at 150 s of recovery (p = 0.004) following exercise at 80% MVC compared with severe-intensity exercise. Partial recovery of MVC and Qpot were detected within 150 s following Tlim for each exercise intensity; Qpot recovered to baseline values within 150 s of recovery following exercise at 80% MVC. No differences in %VA were detected pre- to post-exercise or across recovery for any intensity. Although further analysis showed sex-specific differences in MVC and Qpot, future studies should closely examine sex-dependent responses to extreme-intensity exercise. It is clear, however, that these data reinforce that mechanisms limiting exercise tolerance during extreme-intensity exercise recover quickly. Novelty: Severe- and extreme-intensity exercise cause independent responses in fatigue accumulation and the subsequent recovery time courses. Recovery of MVC and Qpot occurs much faster following extreme-intensity exercise in both men and women.
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Affiliation(s)
- Andrew M Alexander
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA.,Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | - Shane M Hammer
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA.,Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | - Kaylin D Didier
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA.,Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | - Lillie M Huckaby
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA.,Department of Kinesiology, Kansas State University, Manhattan, KS, USA
| | - Thomas J Barstow
- Department of Kinesiology, Kansas State University, Manhattan, KS, USA.,Department of Kinesiology, Kansas State University, Manhattan, KS, USA
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