ArticleJournal of applied physiology (Bethesda, Md. : 1985)2013
Age-related slowing of myosin actin cross-bridge kinetics is sex specific and predicts decrements in whole skeletal muscle performance in humans.
Article in Journal of applied physiology (Bethesda, Md. : 1985), 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01190046 (Muscle Disuse and Contractile Dysfunction in the Elderly), which is not on this map. Cited by 80 papers, 5 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Muscle Disuse and Contractile Dysfunction in the Elderly
Who cites it
80 citing papers in PubMed, 5 syntheses or guidelines pooled it, 124 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
- Effects of age on human skeletal muscle: a systematic review and meta-analysis of myosin heavy chain isoform protein expression, fiber size, and distribution.American journal of physiology. Cell physiology · 2024Pooled it
- Gene Ontology (GO)-Driven Inference of Candidate Proteomic Markers Associated with Muscle Atrophy Conditions.Molecules (Basel, Switzerland) · 2022Pooled it
- Improvements in skeletal muscle fiber size with resistance training are age-dependent in older adults: a systematic review and meta-analysis.Journal of applied physiology (Bethesda, Md. : 1985) · 2020Pooled it
- Ageing, Muscle Power and Physical Function: A Systematic Review and Implications for Pragmatic Training Interventions.Sports medicine (Auckland, N.Z.) · 2016Pooled it
- Dietary nitrate and muscle contractile function in women: effect of menstrual cycle phase.Journal of applied physiology (Bethesda, Md. : 1985) · 2026Trial
- Short-term beetroot juice supplementation improves muscle speed and power but does not reduce blood pressure or oxidative stress in 65-79 y old men and women.Nitric oxide : biology and chemistry · 2023Trial
- Shatavari Supplementation in Postmenopausal Women Improves Handgrip Strength and IncreasesNutrients · 2021Trial
- A Single Dose of Dietary Nitrate Increases Maximal Knee Extensor Angular Velocity and Power in Healthy Older Men and Women.The journals of gerontology. Series A, Biological sciences and medical sciences · 2020Trial
- Relationship of Physical Function to Single Muscle Fiber Contractility in Older Adults: Effects of Resistance Training With and Without Caloric Restriction.The journals of gerontology. Series A, Biological sciences and medical sciences · 2019Trial
- Phosphate and acidosis cause fibre type-specific changes to cellular and molecular contractile mechanics at 37°C in skeletal muscle from older adults.Experimental physiology · 2026Article
- Isometric slow- and fast-contracting skeletal muscle fibres have more similar cellular and molecular properties at 37°C than at 25°C in older adults.The Journal of physiology · 2026Article
- Cellular signaling within aged skeletal muscle reveals a dysregulated stress-induced remodeling response following volumetric muscle loss in female mice.Physiological reports · 2026Article
- Three-dimensional imaging reveals preserved intrinsic contractile function in aging human skeletal muscle fibers.bioRxiv : the preprint server for biology · 2026Article
- Association between TMG-derived contractile muscle parameters and MRI-based muscle structure in sarcopenia.BMC musculoskeletal disorders · 2026Article
- Effects of acidosis and inorganic phosphate on CaAmerican journal of physiology. Cell physiology · 2026Article
- Tensiomyography-derived contractile parameters in sarcopenic and non-sarcopenic older adults.Frontiers in aging · 2026Article
- Using Isometric Squat Strength to Predict Concentric and Eccentric Squat Strength in Young and Older Adults.Physiotherapy research international : the journal for researchers and clinicians in physical therapy · 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
- Using 30-s Prone Back Extension Repetition Maximum Test to Predict Concentric and Eccentric 1 Repetition Maximum Squat Strength in Young and Older Adults.Journal of aging research · 2025Article
20 more citing papers are in PubMed but not listed here.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
9 authors at 1 institution in 1 country.
Funding
Abstract
We hypothesize that age-related skeletal muscle dysfunction and physical disability may be partially explained by alterations in the function of the myosin molecule. To test this hypothesis, skeletal muscle function at the whole muscle, single fiber, and molecular levels was measured in young (21-35 yr) and older (65-75 yr) male and female volunteers with similar physical activity levels. After adjusting for muscle size, older adults had similar knee extensor isometric torque values compared with young, but had lower isokinetic power, most notably in women. At the single-fiber and molecular levels, aging was associated with increased isometric tension, slowed myosin actin cross-bridge kinetics (longer myosin attachment times and reduced rates of myosin force production), greater myofilament lattice stiffness, and reduced phosphorylation of the fast myosin regulatory light chain; however, the age effect was driven primarily by women (i.e., age-by-sex interaction effects). In myosin heavy chain IIA fibers, single-fiber isometric tension and molecular level mechanical and kinetic indexes were correlated with whole muscle isokinetic power output. Collectively, considering that contractile dysfunction scales up through various anatomical levels, our results suggest a potential sex-specific molecular mechanism, reduced cross-bridge kinetics, contributes to the reduced physical capacity with aging in women. Thus these results support our hypothesis that age-related alterations in the myosin molecule contribute to skeletal muscle dysfunction and physical disability and indicate that this effect is stronger in women.
Indexed as
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What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.