United Kingdom

ISTRC 2021 - International Sarcopenia Translational Research Conference

Adiposity and grip strength: a Mendelian Randomisation study

grip strength; adipsoity; mendelian randomisation

Welcome to the inaugural International Sarcopenia Translational Research Conference.  “Where Worlds Meet” – the event brings together a broad range of researchers and practitioners in a truly interdisciplinary forum, covering discovery science through to clinical practice.

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Access to this event requires a registration. Please email Eleanor Lockhart at sarcconf@ncl.ac.uk if you have any questions regarding your registration. 

poster

Introduction: Sarcopenia has been defined as a progressive and generalised skeletal muscle disorder that occurs in advanced ageing (1). Sarcopenia is associated with increased mortality, disability, risk of falls and increased cost of care during hospital admissions (1-4). In 2019, European Working Group of Sarcopenia in Older People updated their definition of sarcopenia (EWGSOP2) (5) and placed a greater emphasis on the importance of muscle strength. In the last decade, Ireland has experienced an increase in the number of older adults (>65) and the Central Statistics Office has predicted that, by 2030, one in five Irish people will be over the age of 65 (6). Currently, the prevalence of sarcopenia in older adults in Ireland is not known. In community dwelling older adults, the prevalence of sarcopenia is widely debated, ranging from 0-50% (7). The early identification of sarcopenia in older adults is important for preventing the adverse outcomes associated with the muscle disease. One essential component of the model of care of older adults in Ireland is the day hospital service (8). Those attending a day hospital receive medical care and multidisciplinary intervention, due to a change or decline in their health or function. Methods: A consecutive series of older adults attending the Robert Mayne Day Hospital (RMDH) in St James’s Hospital (SJH) Dublin, Ireland were invited to take part in the study between October 2019 and March 2020. Due to limited resources, not all participants could be prescribed a physical accelerometer. However, every third participant was prescribed a physical accelerometer. All accelerometers were worn on the participant’s non-dominant wrist for a 7-day period. Results: A total of 134 participants were recruited to the study. The participants had a mean age of 81.7 (SD 7.1), with a range from 65-98. Sixty-one percent (N=82) were female. Conclusion: This is the first study to apply the EWGSOP2 criteria to older adults living in the community in an Irish day hospital setting. The findings highlight the feasibility of applying the EWGSOP2 screening process easily and safely in this setting. The method of strength test influenced the prevalence as well as which variables were independently associated with sarcopenia, potentially highlighting different pathophysiological changes between the two types of sarcopenia. To appropriately manage sarcopenia, the assessment of sarcopenia needs be more consistent regarding the use of the EWGSOP2 guidelines, as seen with the assessment of muscle strength in this study. More routine assessment of sarcopenia using the EWGSOP2 criteria and consistent assessment tools, would enable a greater understanding of the factors that influence sarcopenia (i.e. falls or hospitalisation) and changes in sarcopenia after hospitalisation or acute illness.

Prevalence of Sarcopenia and Assocaited Factors in Older Adults Attending a Day Hospital Service in Ireland

Introduction: • Sarcopenia often co-occurs with osteoporosis, however most of the evidence has been derived from cross-sectional studies. • There is very limited evidence on the association of sarcopenia and incident osteoporosis from prospective studies. Methods: • 168,684 participants (48.8% of women) were included in this prospective study. • After a median follow-up of 7.4 years, 6,296 were diagnosed with osteoporosis. • Sarcopenia (both pre-sarcopenia and sarcopenia) and its individual components were defined according to the EWGSOP2 criteria (2019). • Associations with incident osteoporosis were investigated using Cox-proportional hazard models adjusted for potential confounder factors: sociodemographic, lifestyle, health-related factors, and morbidity count. Results: • After adjusting for relevant confounding factors, presarcopenia was associated with 1.3-times higher risk of incident osteoporosis in men but not in women. • Sarcopenia was associated with 1.66-times increased incident osteoporosis risk in women but not in men. • In terms of individual components, low muscle mass followed by slow gait speed were associated with a higher risk of incident osteoporosis in both sexes. Discussion: • Pre-sarcopenic men and sarcopenic women had a higher risk of developing osteoporosis even after adjustment for a large range of potential confounders. • Considering that sarcopenia could be prevented, health interventions to improve physical capability may delay or prevent the onset of osteoporosis.

What is the association between sarcopenia and incident osteoporosis? A prospective study from UK Biobank

Background: Association of dietary intake and serum level of polyunsaturated-fatty-acids (omega-3 PUFA) with physical function and body composition in older adults remained inconclusive. Method: Study subjects were 554 women from the Osteoporosis-Risk-Factor-and-PreventionFracture Prevention-Study, with dietary intake assessed with 3-day food record at baseline. Total omega-3 PUFA and DHA blood concentrations were analysed using a highthroughput proton (1H) NMR spectrometry metabolomics platform at the University of Eastern Finland. Multiple physical function tests and short physical performance battery (SPPB) was calculated at the baseline and 3-year followup. Results: The multivariable adjusted models showed statistically-significant associations for ALA with higher SPPB (β= 0.118, P=0.024), knee-extension-force at baseline (β= 0.075, P=0.037) and lower fat mass (β= - 0.081, P=0.034), as well as longer one-leg-stance (βbaseline= 0.119, βfollw-up=0.090, P<0.023), higher walking speed (βbaseline= 0.113, βfollw-up=0.144, P<0.047), and ability to squat to the ground (βbaseline= 0.110, βfollwup=0.096, P<0.047) at baseline and follow-up. Total omega-3 PUFA was statistically-significantly associated with better SPPB (βbaseline= 0.108, P=0.039), one-leg-stance (βbaseline= 0.102, P=0.041), walking speed (βbaseline= 0.110, βfollw-up=0.128, P<0.028) and ability to squat (βbaseline= 0.110, P=0.028). Associations for dietary EPA and DHA, serum omega-3 PUFA and DHA with physical function and body composition was not significant.

Dietary omega-3 polyunsaturated fatty acid and alpha-linolenic acid are associated with sarcopenia indices in older women 65-72 years.
Masoud Isanejad 1, 2, Toni Rikkonen 3, Behnam Tajik 4, Joonas Sirola

Background: Population of elderly in Indonesia is predicted to increase to 36 million in 2025. Increasing in life expectancy will be followed by health problem, one of which is sarcopenia. Screening and diagnosis are required to identify sarcopenia especially in community, so that early and comprehensive management can be applied for elderly. Method: This study is a cross sectional study in elderly population in Sarirejo village office. Total 29 elderly met inclusion criteria were involved in this study. Mini-Cog assessment was performed to screen cognitive impairment. Furthermore database were collected followed by MNA. Examination of lower extremities muscle mass was performed by dual x-ray absorptiometry (DXA) using General Electric health bone health. Physical performance was examined by time up and go (TUG) test. Data result were analyzed and statistically test using Pearson correlation and Ranged Spearman. Results: 27 (93,1%) women and 2 (6,9%) man involved in this study, with educational level of 10,3% (3 sample) have no education level, 48,3% (14 sample) have elementary level, 13,8% (4 sample) have junior high school level, 27,6% (8 sample) have senior high school level. Total of 93,1% (27 sample) were married, and 6,9% (2 sample ) were unmarried. From 29 sample, they were divided into 3 ranged group of age, according to WHO classification. Variable analysis result of TUG score with ranged group of age showed positive correlation with increasing age, F= 3.277, P=0,005. Correlation between age (in common) and TUG score showed result with increasing age (in common), followed by decreasing physical performance (P=0,009; r=0,477). Correlation between body mass index (BMI) score with DXA score showed result with increasing BMI score, followed by higher DXA score (P=<0,001; r=0,838). BMI was also showed positive correlation with sarcopenia group with P=<0,001. There was no correlation between MNA score with sarcopenia (P=0,419) and TUG test with sarcopenia (P=0,674). Conclusion: There was no correlation between MNA score, physical performance with sarcopenia.

Correlation Between Sarcopenia and Tug, and Sarcopenia With Physical Performance in Elderly Subjects in Sarirejo Village Semarang

Introduction: Coronavirus disease-2019 (COVID-19) is an infectious disease caused by SARS-CoV-2 virus.  The role of skeletal muscle mass in modulating immune response is well documented. Whilst obesity is well-established as a key factor in COVID-19 and outcome, no study has examined the influence of both sarcopenia (low muscle mass) and obesity, termed ‘sarcopenic obesity’ on COVID-19 risk. Using the UK Biobank, we aimed to association between sarcopenic obesity and the risk of COVID-19. Methods: Fully adjusted logistic regression used to analyse associations; covariates included age, ethnicity, socioeconomic status, & comorbidity. Discussion: Sarcopenic obesity significantly increased the likelihood of severe COVID-19 above that of obesity alone (regardless of low muscle mass definition). The mechanisms for this association are complex but could be a result of a reduction in respiratory functioning, immune response, and ability to respond to metabolic stress, Therapeutic approaches targeting both skeletal muscle and adiposity should form a key part in the treatment of COVID-19. 

Sarcopenic obesity and the risk of hospitalisation or death from COVID-19: findings from UK Biobank

Background: The European Working Group on Sarcopenia in Older People definition (EWGSOP2) follows different assessment steps to identify older adults with sarcopenia. Considering that aged population in Spain has a higher percentage of women, the aim of this study was to detect how the EWGSOP2 assessment steps decline in earlier ages in women in order to focus on them when identifying sarcopenia. Methods: Study design: Multicenter cross-sectional study. Participants: 193 older women (mean age: 77.8 +/- 9.1 years), from Valencia (Spain). Assessments and classification: Assessment steps and cut-offs of the EWGSOP2 algorithm (Figure 1). Assessments which showed detection at earlier ages were included for the classification: 1) probable sarcopenia; 2) confirmed sarcopenia; and 3) severe sarcopenia. Age groups: 65-74, 75-84 and ≥85 years old. Statistical analysis: to compare age groups Chisquare test and 1-factor ANOVA, or ANOVA-Welch adjusted by Bonferroni or Games-Howell, respectively. Results: Chair stand shows decline from 65 years old onwards, while ASM, gait speed and SPPB show it from 75 years, all of them with significant differences as aging occurs (p<0.001). On the contrary, ASM Index remains over the cut-off (>5.5 kg/m2) in all age groups. Consequently, participants were classified according to Chair stand, ASM and SPPB, showing that 50% of women aged ≥85 had severe sarcopenia. Conclusion: Chair stand, ASM and SPPB or gait speed seem to be early measurement detectors of sarcopenia for older women. These measurements should be considered in clinical settings in order to apply early intervention. Conclusion: Chair stand, ASM and SPPB or gait speed seem to be early measurement detectors of sarcopenia for older women. These measurements should be considered in clinical settings in order to apply early intervention.

Following the steps of the EWGSOP2 to detect sarcopenia
according to age groups in older women

Background: Sarcopenia is a prevalent condition with aging, and it is related to clinical and functional decline. Previously care setting has shown to play an important role in sarcopenia prevalence, plus in Spain aged population has a high percentage of women. Objective: to analyse the clinical and functional characteristics of community-dwelling and institutionalised older women with or without sarcopenia. Methods: Study design: A multicentre cross-sectional study. Setting: Valencia (Spain), Jan 2019-Feb 2020. Sample: older women (n=197), living in community (48.2%) and in residential facilities (51.8%). Clinical variables: number of medications, visits to doctor, number of hospitalisation stays, falls, Abbreviated Charlson’s Comorbidity Index. Results: Sarcopenic older women living in community took more medication (p=0.021) and presented significant functional decline for Barthel Index and biceps strength (both p= 0.0001) compared to non-sarcopenic women. Institutionalised sarcopenic older women showed higher number of falls (p=0.001), a decline of Barthel Index and biceps strength (both p= 0.0001), and also a significant decline in quadriceps strength (p=0.001) and calf circumference (p=0.004) compared to nonsarcopenic women. Conclusion: Number of medication and number of falls are characteristic of sarcopenic women living in community and institutionalised, respectively. The main functional variables that characterise sarcopenic women, whether they live in the community or institutionalised are Barthel Index and biceps strength. Clinicians may take these findings into consideration in order to identify sarcopenic women depending on their living setting.

Clinical and functional characteristics of sarcopenic vs non sarcopenic older women living in different settings

Background: 1) Cow’s milk is a source of several nutrients and non-nutrients that synergistically may be beneficial for skeletal muscle . 2) Muscle strength (grip strength, GS), a key component of sarcopenia , declines with advancing age , and has been proposed as a biological marker of ageing. 3) Evidence that links milk intake to decline in muscle strength from midlife to old age is lacking. Methods: 1) Analytic sample: 2723 (50.8% women) participants who had data for at least one exposure (milk, g/day) and one outcome (GS, kg). 2) Milk intake assessment: 5-day food diaries (ages 36, 43, 53 and 60-64 years) 6 . 3) Exposure: grand mean of total, reduced-fat and full-fat milk consumption were each categorised in thirds (T1 (lowest) to T3 (highest)). 4) Outcomes: maximum GS at ages 53, 60-64, and 69 years, and probable sarcopenia at age 69 defined by sex-specific cut-offs (<16 kg in women; <27 kg in men) 2 . 5) Statistical analyses: logistic regression to examine the risk of probable sarcopenia, and multilevel models to investigate decline in GS in relation to milk intake thirds. Conclusion: The data suggests that a higher milk consumption across adulthood is associated with better muscle strength in midlife and may reduce the risk of sarcopenia in later life.

Association between milk intake and decline in muscle strength from mid- to late life: the MRC National Survey of Health and Development

Introduction: 1) Low-income countries are expected to see the largest increase in over 60-year-olds over the next 30 years.1 This will lead to an increase in age related conditions such as sarcopenia and frailty. Assessing the prevalence and relationship of these syndromes is important in understanding how many older adults may be affected. 2) Sarcopenia has rarely been studied in rural communities in lowincome countries, yet may be an important contributor to poor health and impaired functioning. Bioimpedance analysis (BIA) and physical function tests used in the diagnosis of sarcopenia have also been associated with frailty. Methods: 1) Data were analysed from a randomly selected frailty-weighted sample of 235 adults aged ≥60 years from 5 randomly selected villages in Hai district, Kilimanjaro region of northern Tanzania. 2) This cohort was created from 1207 older adults who were screened using the Brief Frailty Instrument for Tanzania (B-FIT) to generate a sample with an artificially inflated number of frail and pre-frail individuals. 3) A diagnosis of sarcopenia was derived using the European Working Group on Sarcopenia in Older People’s definition; using estimated appendicular skeletal muscle mass by BIA, and grip strength. Those who also had poor physical performance by a low “timed up and go” (TUG) score were categorised as having severe sarcopenia. 4) Frailty was identified through a comprehensive geriatric assessment. Results: 1) A strong association was observed between frailty and sarcopenia: Chi2 test X= 35.475 (p <0.001), suggesting a relationship between the two syndromes. 2) Of the 235 individuals, 194 had complete data for grip strength, anthropometric and BIA measurements, allowing a diagnosis of sarcopenia to be derived. 47 (24.2%) participants had sarcopenia, of whom 19 had severe sarcopenia. Adjusting for frailty-weighting, the estimated prevalence of sarcopenia and severe sarcopenia in the screened population was 19.5% and 5.4% respectively. 3) 41 of the 235 individuals investigated did not have sufficient data recorded to diagnose sarcopenia, this included grip strength and measurements needed for bioimpedance analysis. 4) Phase angle (by BIA), grip strength and TUG all predicted frailty independently in multivariate regression analyses. 5) All of the physical factors investigated were significantly poorer in the frail group compared to the non-frail group (p<0.001). Conclusion: 1) The estimated prevalence of sarcopenia in rural northern Tanzania was 19.5%, this prevalence is higher than global estimates of sarcopenia in ≥60 year olds. 2) Phase angle and physical function tests were effective at predicting frailty in this population. 3) Bioimpedance may be an effective method for assessing sarcopenia in Northern Tanzania, and other low resource environments. 

Investigating the Prevalence of Sarcopenia, and its Association with Frailty in Northern Tanzania

Introduction: The prevalence of PD and sarcopenia both increase with age. They share features of pathogenesis including IL6 driven neuroinflammation and mitochondrial dysfunction. However the degree to which they co-occur and if the presence of sarcopenia is influenced by Parkinson’s disease stage is unknown. Methods: Predefined literature search strategies were used on MEDLINE, EMBASE, Scopus and Web of Science. Studies conducted in people with PD or aPS reporting on the prevalence of sarcopenia or those providing sufficient data to compute this using validated sarcopenia definitions were included. Mean prevalence was calculated across studies. A pooled odds ratio was calculated across studies reporting on prevalence of sarcopenia in controls. Risk of bias was assessed using the AXIS tool. Results: 1683 studies (199 duplicates) were identified through the search; 67 assessed in full; 14 met inclusion criteria. Average study quality score was 14.5/20. The mean prevalence of sarcopenia in parkinsonian patients was 17.9% (range 2- 31.4%). The mean prevalence of probable sarcopenia (i.e. low muscle strength) was 49.1% (range 17.5-76.7%). In all studies with non-parkinsonian controls, sarcopenia was more prevalent in those with parkinsonian disorders. The combined odds ratio was 2.49 (p <0.0001) see fig. 1. UPDRS III score positively correlated with prevalence of sarcopenia but this was not consistently shown in individual studies, see fig 2. Only 3 studies commented on the prevalence of sarcopenia in aPS and there was little agreement as to whether sarcopenia is more prevalent in PD or aPS. Conclusions: Sarcopenia is a prevalent and important issue in parkinsonian disorders. Probable sarcopenia is especially common. Recognition of this should prompt clinical testing and provision of appropriate interventions to minimise negative clinical outcomes associated with movement disorders being compounded by muscle weakness.

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