Three Weeks of Overload Training Increases Resting Muscle Sympathetic Activity
| Autor: | Jamie F. Burr, Philip J. Millar, Jeremy D. Seed, Alexandra M. Coates, Anthony V. Incognito, Connor J. Doherty |
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| Rok vydání: | 2018 |
| Předmět: |
Adult
Male medicine.medical_specialty Sympathetic Nervous System Rest Blood Pressure Physical Therapy Sports Therapy and Rehabilitation 030204 cardiovascular system & hematology Baroreflex Autonomic Nervous System Autonomic regulation 03 medical and health sciences 0302 clinical medicine Heart Rate Internal medicine Heart rate medicine Humans Heart rate variability Orthopedics and Sports Medicine Muscle Skeletal Physical conditioning business.industry Sympathetic nerve activity Sympathetic activity 030229 sport sciences Middle Aged Adaptation Physiological Blood pressure Athletes Exercise Test Cardiology Female business Physical Conditioning Human |
| Zdroj: | Medicine & Science in Sports & Exercise. 50:928-937 |
| ISSN: | 0195-9131 |
| Popis: | Overload training is hypothesized to alter autonomic regulation, although interpretations using indirect measures of heart rate variability are conflicting. The aim of the present study was to examine the effects of overload training on muscle sympathetic nerve activity (MSNA), a direct measure of central sympathetic outflow, in recreational endurance athletes.Measurements of heart rate variability, cardiac baroreflex sensitivity (BRS), MSNA (microneurography), and sympathetic BRS were obtained in 17 healthy triathletes and cyclists after 1 wk of reduced training (baseline) and again after 3 wk of either regular (n = 7) or overload (n = 10) training.After training, the changes (Δ) in peak power output (10 ± 10 vs -12 ± 9 W, P0.001), maximal heart rate (-2 ± 4 vs -8 ± 3 bpm, P = 0.006), heart rate variability (SD of normal-to-normal intervals, 27 ± 31 vs -3 ± 25 ms; P = 0.04), and cardiac BRS (7 ± 6 vs -2 ± 8 ms·mm Hg, P = 0.02) differed between the control and overload groups. The change in MSNA burst frequency (-2 ± 2 vs 4 ± 5 bursts per minute, P = 0.02) differed between groups. Across all participants, the changes in resting MSNA and peak power output were correlated negatively (r = -0.51, P = 0.04). No between-group differences in resting heart rate or blood pressure were observed (all P0.05).Overload training increased MSNA and attenuated increases in cardiac BRS and heart rate variability observed with regular training. These results support neural adaptations after overload training and suggest that increased central sympathetic outflow may be linked with decreased exercise performance. |
| Databáze: | OpenAIRE |
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