ArticleJournal of applied physiology (Bethesda, Md. : 1985)2018
Mechanisms for the age-related increase in fatigability of the knee extensors in old and very old adults.
Article in Journal of applied physiology (Bethesda, Md. : 1985), 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 40 papers, 3 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
40 citing papers in PubMed, 3 syntheses or guidelines pooled it, 70 citations in OpenAlex.
- Sex differences in human skeletal muscle fiber types and the influence of age, physical activity, and muscle group: A systematic review and meta-analysis.Physiological reports · 2025Pooled it
- Pooled it
- Age-related Deficits in Voluntary Activation: A Systematic Review and Meta-analysis.Medicine and science in sports and exercise · 2020Pooled it
- Three-dimensional imaging reveals preserved intrinsic contractile function in aging human skeletal muscle fibers.bioRxiv : the preprint server for biology · 2026Article
- The other half of the sprinting coin: the neuromuscular profile of a 91-yr-old female world record sprinter.Journal of applied physiology (Bethesda, Md. : 1985) · 2026Article
- Initial contractions of a single-load fatiguing exercise provide a valid assessment of age-related differences in peak power.Journal of applied physiology (Bethesda, Md. : 1985) · 2026Article
- The interactive effects of biological sex and skeletal muscle fiber properties on knee-extensor muscle relaxation induced by TMS in unfatigued and fatigued states.European journal of applied physiology · 2026Article
- Myonuclear loss, rather than senescent myonuclei, associates with fiber type-specific atrophy in aging human skeletal muscle.bioRxiv : the preprint server for biology · 2026Article
- Effects of acidosis and inorganic phosphate on CaAmerican journal of physiology. Cell physiology · 2026Article
- Motor performance and aging in males and females.Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology · 2025Review
- The influence of biological sex on the metabolic basis of skeletal muscle fatigue in vivo.The Journal of physiology · 2025Article
- The independent effects of age and sex in performance fatigability profile after a ramp incremental cycling test.European journal of applied physiology · 2025Article
- Mechanisms for the age-related increase in fatigability of the elbow flexor muscles in healthy adults.Physiological reports · 2025Article
- Cellular and molecular contractile function in aged human skeletal muscle is altered by phosphate and acidosis and partially reversed with an ATP analog.American journal of physiology. Cell physiology · 2025Article
- Are females getting more fatigable as they age?European journal of applied physiology · 2025Article
- Cumulative effects of HThe Journal of physiology · 2025Article
- Neural and muscular contributions to the age-related differences in peak power of the knee extensors in men and women.Journal of applied physiology (Bethesda, Md. : 1985) · 2024Article
- Age-Related Differences in the Functional Demand Placed on the Lumbar Spine during Walking in Healthy Older versus Younger Men.Geriatrics (Basel, Switzerland) · 2024Article
- Finger-specific effects of age on tapping speed and motor fatigability.Frontiers in human neuroscience · 2024Article
- Validation of the Pittsburgh Performance Fatigability Index in the Study of Muscle, Mobility and Aging.The journals of gerontology. Series A, Biological sciences and medical sciences · 2023Article
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
Abstract
The mechanisms for the age-related increase in fatigability during high-velocity contractions in old and very old adults (≥80 yr) are unresolved. Moreover, whether the increased fatigability with advancing age and the underlying mechanisms differ between men and women is not known. The purpose of this study was to quantify the fatigability of knee extensor muscles and identify the mechanisms of fatigue in 30 young (22.6 ± 0.4 yr; 15 men), 62 old (70.5 ± 0.7 yr; 33 men), and 12 very old (86.0 ± 1.3 yr; 6 men) men and women elicited by high-velocity concentric contractions. Participants performed 80 maximal velocity contractions (1 contraction per 3 s) with a load equivalent to 20% of the maximum voluntary isometric contraction. Voluntary activation and contractile properties were quantified before and immediately following exercise (<10 s) using transcranial magnetic stimulation and electrical stimulation. Absolute mechanical power output was 97 and 217% higher in the young compared with old and very old adults, respectively. Fatigability (reductions in power) progressively increased across age groups, with a power loss of 17% in young, 31% in old, and 44% in very old adults. There were no sex differences in fatigability among any of the age groups. The age-related increase in power loss was strongly associated with changes in the involuntary twitch amplitude ( r = 0.75, P < 0.001). These data suggest that the age-related increased power loss during high-velocity fatiguing exercise is unaffected by biological sex and determined primarily by mechanisms that disrupt excitation contraction coupling and/or cross-bridge function. NEW & NOTEWORTHY We show that aging of the neuromuscular system results in an increase in fatigability of the knee extensors during high-velocity exercise that is more pronounced in very old adults (≥80 yr) and occurs similarly in men and women. Importantly, the age-related increase in power loss was strongly associated with the changes in the electrically evoked contractile properties suggesting that the increased fatigability with aging is determined primarily by mechanisms within the muscle for both sexes.
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