Impact of age on the development of fatigue during large and small muscle mass exercise
| Autor: | Chris J. McNeil, Simranjit K. Sidhu, Markus Amann, Ryan S. Garten, Russell S. Richardson, Joshua C. Weavil, Taylor S. Thurston, Ashley D. Nelson, Thomas J. Hureau |
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| Rok vydání: | 2018 |
| Předmět: |
Adult
Male medicine.medical_specialty Time Factors Physiology Pyramidal Tracts Muscle mass Quadriceps Muscle 03 medical and health sciences Young Adult 0302 clinical medicine Physical medicine and rehabilitation Physiology (medical) medicine Reaction Time Aerobic exercise Humans Muscle Strength Exercise Aged business.industry Electromyography Age Factors 030229 sport sciences Evoked Potentials Motor Transcranial Magnetic Stimulation Electric Stimulation Bicycling Neuromuscular fatigue Torque Muscle Fatigue Active muscle Cycling business 030217 neurology & neurosurgery Femoral Nerve Muscle Contraction Research Article |
| Zdroj: | American journal of physiology. Regulatory, integrative and comparative physiology. 315(4) |
| ISSN: | 1522-1490 |
| Popis: | To examine the impact of aging on neuromuscular fatigue following cycling (CYC; large active muscle mass) and single-leg knee-extension (KE; small active muscle mass) exercise, 8 young (25 ± 4 years) and older (72 ± 6 years) participants performed CYC and KE to task failure at a given relative intensity (80% of peak power output). The young also matched CYC and KE workload and duration of the old (iso-work comparison). Peripheral and central fatigue were quantified via pre-/postexercise decreases in quadriceps twitch torque (∆Qtw, electrical femoral nerve stimulation) and voluntary activation (∆VA). Although young performed 77% and 33% more work during CYC and KE, respectively, time to task failure in both modalities was similar to the old (~9.5 min; P > 0.2). The resulting ΔQtw was also similar between groups (CYC ~40%, KE ~55%; P > 0.3); however, ∆VA was, in both modalities, approximately double in the young (CYC ~6%, KE ~9%; P < 0.05). While causing substantial peripheral and central fatigue in both exercise modalities in the old, ∆Qtw in the iso-work comparison was not significant (CYC; P = 0.2), or ~50% lower (KE; P < 0.05) in the young, with no central fatigue in either modality ( P > 0.4). Based on iso-work comparisons, healthy aging impairs fatigue resistance during aerobic exercise. Furthermore, comparisons of fatigue following exercise at a given relative intensity mask the age-related difference observed following exercise performed at the same workload. Finally, although active muscle mass has little influence on the age-related difference in the rate of fatigue at a given relative intensity, it substantially impacts the comparison during exercise at a given absolute intensity. |
| Databáze: | OpenAIRE |
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