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Influence of Diaphragm Fatigue on Exercise Performance and Locomotor Muscle Fatigue
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | Influence of Diaphragm Fatigue on Exercise Performance and Locomotor Muscle Fatigue. |
| 개인저자 | Fulton, Timothy John. |
| 단체저자명 | Indiana University. School of Public Health. |
| 발행사항 | [S.l.]: Indiana University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 105 p. |
| 기본자료 저록 | Dissertations Abstracts International 80-12B. Dissertation Abstract International |
| ISBN | 9781392239889 |
| 학위논문주기 | Thesis (Ph.D.)--Indiana University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 80-12, Section: B.
Publisher info.: Dissertation/Thesis. Advisor: Chapman, Robert F. |
| 이용제한사항 | This item must not be added to any third party search indexes.This item must not be sold to any third party vendors. |
| 요약 | To determine if respiratory muscle fatigue alters central motor output, locomotor muscle fatigue, and exercise performance, eight trained cyclists performed 5 km cycling time trials under control conditions (CON) and after a resistive breathing task that induced respiratory muscle fatigue (RMF). Central motor drive was estimated using vastus lateralis surface electromyography (EMG) and expressed as a percent of EMG during maximal contractions. Locomotor muscle fatigue was assessed by measuring potentiated quadriceps twitch force before and after each cycling time trial and expressed as a percent change from baseline. Time to complete the time trial was ~2% longer (i.e. worse performance) in RMF compared with CON (464 짹 24 v. 455 짹 26 sec, P < 0.001). Locomotor muscle fatigue was attenuated in RMF compared with CON (-22 + 6%, v. -28 짹 7%, P = 0.02). Central motor output was lower in RMF compared with CON during the first and second km (45 짹 11 v. 53 짹 13%, P = 0.004 and 45 짹 14 v. 51 짹 14%, P = 0.008, respectively), but was not different thereafter. Power output was lower in RMF compared with CON during the first and second km (308 짹 62 v. 370 짹 92 W, P = 0.012 and 300 짹 53 v. 321 짹 51 W, P = 0.009, respectively), but was not different thereafter. Although minute ventilation was lower in RMF compared with CON during the first and second km (114 짹 19 v. 135 짹 24 L min-1, P = 0.003 and 136 짹 23 v. 152 짹 31 L min-1, P = 0.009, respectively), ratings of dyspnea were similar (4 짹 1 v. 5 짹 2 and 6 짹 1 v. 6 짹 2, respectively). It seems that alterations to dyspnea for a given minute ventilation, secondary to respiratory muscle fatigue, constrained central motor drive and power output during cycling exercise, thereby limiting the development of locomotor muscle fatigue. These findings indicate that the respiratory system influences the sensory tolerance limit and is an integral component in a global negative feedback loop that regulates exercise performance and the development of locomotor muscle fatigue. |
| 일반주제명 | Kinesiology. |
| 언어 | 영어 |
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