Performance on the Single-Legged Step Down and Running Mechanics

Context Previous authors have shown associations between kinematics on the single-legged step down (SLSD) and running mechanics. Therefore, the SLSD may be a useful tool for identifying runners with poor running mechanics when 2- or 3-dimensional gait analysis is not available. However, the associations between SLSD performance and running kinetics, as well as the influences of sex and muscle strength on these relationships, remain unclear. Objective To evaluate whether kinematics on the SLSD predict kinematics and kinetics while running and whether the relationships differ between men and women and are mediated by muscle strength. Design Cross-sectional study. Setting Biomechanics research laboratory. Patients or Other Participants Fifty highly trained runners (25 men, 25 women; age = 27.8 ± 9.2 years, height = 1.69 ± 0.26 m, mass = 66.3 ± 15.0 kg, running distance = 45.2 ± 19.1 mile/wk [72.32 ± 30.56 km/wk]). Main Outcome Measure(s) Relationships between kinematics on the SLSD and kinematics and kinetics during running were evaluated. We also assessed whether muscle strength moderated these relationships. Results For men, linear regression revealed that peak hip adduction (R2 = 0.306, P = .012), internal rotation (R2 = 0.439, P = .002), knee valgus (R2 = 0.544, P = .001), and rearfoot eversion (R2 = 0.274, P = .008) on the SLSD were strongly predictive of kinematics during running. In women, only peak hip internal rotation (R2 = 0.573, P = .001), knee valgus (R2 = 0.442, P = .001), and rearfoot eversion (R2 = 0.384, P = .012) predicted running kinematics. In women, total medial collapse on the SLSD predicted peak hip-adductor moment (R2 = 0.364, P = .001) during running. None of the relationships were moderated by muscle strength in either men or women. Conclusions Kinematics during the SLSD predicted kinematics while running in both men and women but only predicted kinetics while running in women. Given that none of the relationships between SLSD performance and running mechanics were moderated by muscle strength, clinicians should assess movement quality and strength independently.

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A cross-sectional study of muscle strength and mass in 45- to 78-yr-old men and women

Journal of Applied Physiology ◽

10.1152/jappl.1991.71.2.644 ◽

1991 ◽

Vol 71 (2) ◽

pp. 644-650 ◽

Cited By ~ 611

Author(s):

W. R. Frontera ◽

V. A. Hughes ◽

K. J. Lutz ◽

W. J. Evans

Keyword(s):

Muscle Strength ◽

Peak Torque ◽

Cross Sectional Study ◽

Fat Free Mass ◽

Knee Extensors ◽

Cross Sectional ◽

Men And Women ◽

Age Related ◽

Muscle Groups ◽

Old Men

The isokinetic strength of the elbow and knee extensors and flexors was measured in 200 healthy 45- to 78-yr-old men and women to examine the relationship between muscle strength, age, and body composition. Peak torque was measured at 60 and 240 degrees/s in the knee and at 60 and 180 degrees/s in the elbow by use of a Cybex II isokinetic dynamometer. Fat-free mass (FFM) was estimated by hydrostatic weighing in all subjects, and muscle mass (MM) was determined in 141 subjects from urinary creatinine excretion. FFM and MM were significantly lower (P less than 0.001) in the oldest group. Strength of all muscle groups at both testing speeds was significantly (P less than 0.006) lower (range 15.5–26.7%) in the 65- to 78- than in the 45- to 54-yr-old men and women. When strength was adjusted for FFM or MM, the age-related differences were not significant in all muscle groups except the knee extensors tested at 240 degrees/s. Absolute strength of the women ranged from 42.2 to 62.8% that of men. When strength was expressed per kilogram of MM, these gender differences were smaller and/or not present. These data suggest that MM is a major determinant of the age- and gender-related differences in skeletal muscle strength. Furthermore, this finding is, to a large extent, independent of muscle location (upper vs. lower extremities) and function (extension vs. flexion).

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Association of major dietary patterns with muscle strength and muscle mass index in middle-aged men and women: Results from a cross-sectional study

Clinical Nutrition ESPEN ◽

10.1016/j.clnesp.2020.06.010 ◽

2020 ◽

Vol 39 ◽

pp. 215-221

Author(s):

Hossein Shahinfar ◽

Maryam Safabakhsh ◽

Nadia Babaei ◽

Mojdeh Ebaditabar ◽

Samira Davarzani ◽

...

Keyword(s):

Muscle Strength ◽

Muscle Mass ◽

Dietary Patterns ◽

Cross Sectional Study ◽

Sectional Study ◽

Middle Aged ◽

Cross Sectional ◽

Men And Women

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Shoulder External- and Internal-Rotation Isokinetic Strength in Master’s Swimmers

Journal of Sport Rehabilitation ◽

10.1123/jsr.14.1.12 ◽

2005 ◽

Vol 14 (1) ◽

pp. 12-19 ◽

Cited By ~ 6

Author(s):

Deb West ◽

Gisela Sole ◽

S. John Sullivan

Keyword(s):

Muscle Strength ◽

Internal Rotation ◽

External Rotation ◽

Peak Torque ◽

Cross Sectional Study ◽

Control Group ◽

Cross Sectional ◽

Shoulder External Rotation ◽

Torque Values ◽

Shoulder Muscle Strength

Objectives:To establish muscle-strength and -balance profiles for shoulder external rotation (ER) and internal rotation (IR) in master’s swimmers.Design:Cross-sectional study.Setting:Laboratory.Participants:Six male and seven female master’s swimmers and a matched control group.Measurements:Concentric and eccentric ER and IR shoulder movements were recorded (Kin-Com™ isokinetic dynamometer). Peak-torque values, concentric ER:IR ratios, eccentric ER:IR (conventional) ratios, and eccentric ER:concentric IR (functional) ratios were examined between groups.Results:Mean peak-torque values ranged from 21.23 to 37.69 N · m for the swimmers, which, although 15% to 27% greater than those of the controls, were not statistically different. Conventional (0.78:0.86) and functional (1.06:1.17) ratios did not differ between groups.Conclusions:These data will contribute to the development of guidelines for assessing shoulder-muscle strength in Master’s swimmers.

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Age-related declines in the swallowing muscle strength of men and women aged 20–89 years: A cross-sectional study on tongue pressure and jaw-opening force in 980 subjects

Archives of Gerontology and Geriatrics ◽

10.1016/j.archger.2018.05.015 ◽

2018 ◽

Vol 78 ◽

pp. 64-70 ◽

Cited By ~ 18

Author(s):

Koji Hara ◽

Haruka Tohara ◽

Kenichiro Kobayashi ◽

Kohei Yamaguchi ◽

Kanako Yoshimi ◽

...

Keyword(s):

Muscle Strength ◽

Cross Sectional Study ◽

Tongue Pressure ◽

Sectional Study ◽

Cross Sectional ◽

Men And Women ◽

Age Related ◽

Jaw Opening

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Trends and differences in sexual practices and sexually transmitted infections in men who have sex with men only (MSMO) and men who have sex with men and women (MSMW): a repeated cross-sectional study in Melbourne, Australia

BMJ Open ◽

10.1136/bmjopen-2020-037608 ◽

2020 ◽

Vol 10 (11) ◽

pp. e037608

Author(s):

Mario Martín-Sánchez ◽

Richard Case ◽

Christopher Fairley ◽

Jane S Hocking ◽

Catriona Bradshaw ◽

...

Keyword(s):

Health Centre ◽

Cross Sectional Study ◽

Sexual Practices ◽

Sectional Study ◽

Anal Sex ◽

Cross Sectional ◽

Men And Women ◽

Sexually Transmitted ◽

Receptive Anal Sex ◽

Sex With Men

ObjectivesIn the 2010s, there has been an increase in sexually transmitted infections (STI) in men who have sex with men (MSM) in Australia, and since 2015 also in urban heterosexuals. Men who have sex with both men and women (MSMW) have characteristics that may differ from both men who have sex with men only (MSMO) and heterosexual men. We aimed to compare the sexual practices and the trends in HIV/STI positivity between MSMO and MSMW.DesignRepeated cross-sectional study.SettingA sexual health centre in Melbourne, Australia.ParticipantsMSM aged 18 years and above who attended the Melbourne Sexual Health Centre for the first time between 2011 and 2018. This includes 12 795 MSMO and 1979 MSMW.Primary outcome measuresDemographic characterics, sexual practices and HIV/STI positivity.ResultsCompared with MSMW, MSMO were more likely to practice anal sex and to have condomless receptive anal sex with casual male partners, and less likely to have a current regular relationship. Over the 8-year period, there was an increase in condomless receptive anal sex with casual male partners for both groups (MSMO: from 46.2% to 63.3%, ptrend <0.001; MSMW: from 41.3% to 57.9%, ptrend=0.011). Syphilis positivity increased in MSMO (from 5.5% to 7.9%, ptrend=0.012) and MSMW (from 0.9% to 6.4%, ptrend=0.004) and HIV remained stable. Gonorrhoea increased among MSMO from 2011 to 2014 (from 6.7% to 9.6%, ptrend=0.002), and remained stable from 2015 to 2018. MSMO had higher odds of testing positive for gonorrhoea (adjusted OR (aOR) 1.36, 95% CI 1.13 to 1.64), chlamydia (aOR 1.39, 95% CI 1.16 to 1.67), syphilis (aOR 1.74, 95% CI 1.37 to 2.22) and HIV (aOR 4.60, 95% CI 2.43 to 8.70) than MSMW.ConclusionsMSMW have overall lower condomless sex and lower HIV/STI positivity. In the last years, changes in sexual practices in MSM have affected both MSMW and MSMO leading to an increased STI risk.

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Increased modifiable cardiovascular risk factors in patients with Takayasu arteritis: a multicenter cross-sectional study

Advances in Rheumatology ◽

10.1186/s42358-020-00157-1 ◽

2021 ◽

Vol 61 (1) ◽

Author(s):

Alexandre Moura dos Santos ◽

Rafael Giovani Misse ◽

Isabela Bruna Pires Borges ◽

Bruno Gualano ◽

Alexandre Wagner Silva de Souza ◽

...

Keyword(s):

Quality Of Life ◽

Risk Factors ◽

Muscle Strength ◽

Aerobic Capacity ◽

Cross Sectional Study ◽

Sectional Study ◽

Cross Sectional ◽

Metabolic Equivalent ◽

Handgrip Test

Abstract Background Modifiable cardiovascular risk factors (MCRFs), such as those related to aerobic capacity, muscle strength, physical activity, and body composition, have been poorly studied in Takayasu arteritis (TAK). Therefore, the aim of the study was to investigate MCRFs and their relationships with disease status and comorbidities among patients with TAK. Methods A multicenter cross-sectional study was conducted between 2019 and 2020, in which 20 adult women with TAK were compared with 16 healthy controls matched by gender, age, and body mass index. The following parameters were analyzed: aerobic capacity by cardiopulmonary test; muscle function by timed-stands test, timed up-and-go test, and handgrip test; muscle strength by one-repetition maximum test and handgrip test; body composition by densitometry; physical activity and metabolic equivalent by IPAQ, quality of life by HAQ and SF-36; disease activity by ITAS2010 and NIH score; and presence of comorbidities. Results Patients with TAK had a mean age of 41.5 (38.0–46.3) years, disease duration of 16.0 (9.5–20.0) years, and a mean BMI of 27.7±4.5 kg/m2. Three out of the 20 patients with TAK had active disease. Regarding comorbidities, 16 patients had systemic arterial hypertension, 11 had dyslipidemia, and two had type 2 diabetes mellitus, while the control group had no comorbidities. TAK had a significant reduction in aerobic capacity (absolute and relative VO2 peak), muscle strength in the lower limbs, increased visceral adipose tissue, waist-to-hip ratio, reduced walking capacity, decreased weekly metabolic equivalent, and quality of life (P< 0.05) as compared to controls. However, there were no correlations between these MCRFs parameters and disease activity. Conclusions TAK show impairment in MCRFs; therefore, strategies able to improve MCRF should be considered in this disease.

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