The purpose of this study was to determine whether supraspinal mechanisms contribute the sex difference in fatigability during and recovery from a dynamic isometric fatiguing task with knee extensors.Transcranial magnetic stimulation electrical were used voluntary activation contractile properties extensors 14 men 17 women (20.8 ± 1.9 yr) after 1) 60-s sustained, maximal contraction (MVIC), 2) involving 120 concentric contractions 20% MVIC load.There no differences between reduction torque...

To expose cortical involvement in age-related changes motor performance, we compared steadiness (force fluctuations) and fatigability of submaximal isometric contractions with the ankle dorsiflexor muscles older young adults varying levels cognitive demand imposed. Sixteen (20.4 ± 2.1 year: 8 men, 9 women) 17 (68.8 4.4 years: attended three sessions performed a 40 s contraction at 5% maximal voluntary (MVC) force followed by an 30% MVC until task failure. The required during each session...

This study investigated mechanisms for the stressor-induced changes in muscle fatigability men and women. Participants performed an isometric-fatiguing contraction at 20% maximal voluntary (MVC) until failure with elbow flexor muscles. Study one ( n = 55; 29 women) involved two experimental sessions: 1) a high-stressor session that required difficult mental-math task before during fatiguing 2) control no mental math. For some participants (n 28; 14 women), cortical stimulation was used to...

A cognitive challenge when imposed during a low-force isometric contraction will exacerbate sex- and age-related decreases in force steadiness, but the mechanism is not known. We determined role of oscillations common synaptic input to motor units on steadiness muscle with concurrent challenge. Forty-nine young adults (19–30 yr; 25 women, 24 men) 36 old (60–85 19 17 performed (counting backward by 13) an elbow flexion task at 5% maximal voluntary contraction. Single-motor were decomposed...

The underrepresentation of the female population in exercise sciences could be attributed, at least part, to difficulty appropriately accounting for effects menstrual cycle (MC). Previous studies examining MC on aerobic performance and subjective measures show conflicting results. Purpose: study examined how affects objective within untrained participants comparison with male assessed similar time intervals. Methods: Twenty-one (12 females 9 males) completed a graded test (GXT) ergometer....

Background: Although fatigue is frequently reported in the clinical setting, factors influencing odds of an individual reporting are not well understood, nor if they similar between males and females across different age groups.

Background Muscle fatigability can increase when a stressful, cognitively demanding task is imposed during low-force fatiguing contraction with the arm muscles, especially in women. Whether this occurs among older adults (> 60 years) currently unknown. Questions/purposes We aimed to determine if higher cognitive demands, stratified by sex, increased years). Secondarily, we assessed varying demand resulted decreased steadiness and was explained anxiety or cortisol levels. Methods Seventeen...

Abstract Background Ischemic preconditioning (IPC) is suggested to decrease fatigability in some individuals but not others. Sex differences response IPC may account for this variability and few studies systematically investigated the effects of men women. The goal study was determine if time task failure, perception pain, neuromuscular mechanisms were altered by Methods Ten women (29 ± 5 years old) 10 (28 6 performed isometric contractions with plantar flexor muscles dominant leg at 20%...

Introduction: Many clinical musculoskeletal pain conditions are characterized by chronic inflammation that sensitizes nociceptors. An unresolved issue is whether affects all nociceptors in a similar manner. Exercise-induced muscle damage (EIMD) has been proposed as model for simulating inflammatory healthy samples. We sought to test the effect of EIMD on various painful stimuli (pressure and thermal), central processing (via nociceptive flexion reflex) endogenous modulation via conditioned...

Flexibility is a key component of physical fitness. It has been suggested that measures fitness components may vary throughout the day. The aim this study was to analyse effects time day on flexibility performance. 26 men (mean age=25.4 years, SD=2.5) were evaluated by hip flexion kinematic analysis and also an absolute score in modified Sit-and-Reach test during repeated measure design. This done 3 experimental sessions, which took place at 8:00 a.m., 1:00 p.m. 6:00 p.m., random order. All...

The purpose of this study was to examine age-related differences in muscle performance women divided into young (YW, 20–39 years, n = 29) middle-aged (MAW, 40–59 33), and older (OW, ≥60 40) age groups. Methods: Hand grip strength, vertical jump performance, knee extensor (KE) strength (0 deg/s, 60 240 deg/s), speed movement (SoM; at 1 Nm, 20%, 40%, 60% isometric strength), endurance (30-repetition test degs/s deg/s) were assessed. Computed tomography-acquired cross-sectional area (mCSA)...

Using smartphones during a task that requires upright posture is suggested to be detrimental for the overall motor performance. The aim of this study was determine role age and specific aspects cognitive function on walking standing tasks in presence smartphone use.51 older (36 women) 50 young (35 women), mean age: 66.5 ± 6.3 22.3 1.7 years, respectively, were enrolled study. impact using assessed dynamic (timed up go, TUG) static balance test (performed force platform). Multivariate...

A análise fotogramétrica pode ser feita por meio de diferentes programas computacionais. Assim, o objetivo do presente estudo foi avaliar a confiabilidade e usabilidade três em uma durante flexão quadril discutir aspectos qualitativos quantitativos cada um deles. Participaram 26 voluntários gênero masculino, com idade entre 19 30 anos (x=25,4 anos, DP=2,5) que realizaram teste sentar alcançar banco Wells adaptado. Marcadores cutâneos foram posicionados nos processos ósseos: trocânter maior...