Whole-body vibration (WBV) training uses a vertically oscillating platform and reports suggest that this perturbation elicits reflexive muscle contractions augment activity contribute to increased strength. No WBV study has measured both upper- lower-body activation. The purpose of was determine the optimal stimulus (frequency × amplitude) increase electromyography (EMG) in muscles for three distinctive unloaded actions: isometric semi-squat, dynamic leg squats, static bilateral bicep curls....

Despite a similar rate of change in average electromyographic (EMG) activity, previous studies have observed different rates mean arterial pressure, heart rate, perceived exertion, and fluctuations motor output during the performance fatiguing contractions that involved types loads. To obtain more direct measure from spinal cord, purpose this study was to compare discharge characteristics same unit biceps brachii two contractions. In separate tests with upper arm vertical elbow flexed 1.57...

Frailty is a clinical geriatric syndrome caused by physiological deficits across multiple systems. These make it challenging to sustain homeostasis required for the demands of everyday life. Exercise likely best therapy reverse frailty status. Literature date suggests that pre-frail older adults, those with 1–2 on Cardiovascular Health Study-Frailty Phenotype (CHS-frailty phenotype), should exercise 2–3 times week, 45–60 min. Aerobic, resistance, flexibility, and balance training components...

The consistency and the number of attempts required to achieve maximal voluntary muscle activation have not been documented compared between young old adults. Furthermore, few studies contrasted functional pairs groups, no study has tested upper limb muscles. purpose this was measure compare elbow flexors extensors in men over two separate test sessions. With method twitch interpolation activation, six (24 ± 1 yr) (83 4 performed five contractions (MVC) during each session for group. Elbow...

This study compared adaptations in fascicle lengths, pennation angles, and muscle thickness of the lateral medial gastrocnemii response to 6 weeks stretch training. The nondominant plantar flexors 11 males were stretched five times per week for with contralateral leg a nonstretched control group 10 males. During training, instantaneous electromyography was utilized ensure passive stretch. At baseline, three, six 1 after conclusion ultrasound used measure gastrocnemius gastrocnemius, Achilles...

Although force fluctuations during a steady contraction are often heightened in old adults compared with young and enhanced the stress response, mechanisms underlying augmentation uncertain. The purpose of study was to compare effect stressor on plasma concentrations selected hormones experienced by performance precision grip. Thirty-six men women (19–86 yr) participated protocol that comprised anticipatory (30 min), (15 recovery periods (25 min). series noxious electrical stimuli applied...

Jakobi, J. M., and E. Cafarelli. Neuromuscular drive force production are not altered during bilateral contractions. Appl. Physiol. 84(1): 200–206, 1998.—Several investigators have studied the deficit in maximal voluntary that is said to occur when muscle groups contract simultaneously. A true (BLD) would suggest a significant limitation of neuromuscular control; however, some data from studies literature equivocal. Our purpose was determine whether there BLD knee extensors untrained young...

Hazell, TJ, Kenno, KA, and Jakobi, JM. Evaluation of muscle activity for loaded unloaded dynamic squats during vertical whole-body vibration. J Strength Cond Res 24(7): 1860-1865, 2010-The purpose this investigation was to examine if the addition a light external load would enhance vibration (WBV)-induced increases in squatting 4 leg muscles. Thirteen recreationally active male university students performed series (unloaded with no WBV, WBV). The set 30% body mass WBV included 25-, 35-,...

Background Many older adults do not meet current physical activity (PA) guidelines, and this might be influenced by environmental factors (e.g., temperature). The purpose of study was to determine how various weather variables influence light PA (LPA), moderate-vigorous (MVPA), sedentary behaviour (SB), steps, time spent walking outdoors. Methods Fifty community-dwelling completed the 10-day assessment period, using a Fitbit fitness tracker, Global Position System (GPS), completing...

Abstract Background Familial hypercholesterolemia (FH) is a genetic condition that affects cholesterol metabolism, resulting in life-long elevated serum levels of low-density lipoprotein cholesterol. Systemically are associated with the onset tendon injury and potentially lead to impaired mechanical properties. Applying cross-sectional design, we examined whether FH patients present altered Achilles biomechanics compared healthy controls conducted correlational analyses determine...

Sport participation among older adults, is increasing, but many still fall short of meeting physical activity (PA) guidelines. Master athletes, who engage in PA through systematic training, and competition, offer unique insights into practices later life. This study explored whether master athletes embody the principles literacy how their experiences could inform strategies to promote adults. An electronic survey completed by 35 (55–75 years, 20 female) follow-up interviews with eight...

Background: Postural stability and muscle activity of older females were assessed during a sit-to-stand (STS) task completed from standard North American toilet. Four STS toilet setups examined: normal height ( normalheight ), raised seat raisedseat seats with bilateral grab bars normalheightbars , raisedseatbars ). Methods: Eight (72 ± 6 years) 8 younger (21 1 participated. Total movement time, difficulty measured as the time hindfoot to forefoot plantar pressure peaks, center (COP)...

Abstract Aim: Healthy adult ageing of the human neuromuscular system is comprised changes that include atrophy, weakness and slowed movements with reduced spinal motor neurone output expressed by lower unit discharge rates (MUDRs). The latter observation has been obtained mostly from hand limb muscles. purpose was to determine extent which elbow flexor extensor contractile properties, MUDRs in six old (83 ± 4 years) young (24 1 men were affected age, whether any adaptations similar for both...

Compartmentalized responses in motor unit (MU) activity of the short head (SH) and long (LH) biceps brachii are observed following forearm position change. Differential muscle spindle afferent distribution has been proposed as a potential mechanism underlying this behaviour. Tendon vibration is an effective, non-invasive method increasing target group offering paradigm which hypothesis may be investigated further.To determine effect tendon on MU recruitment discharge rates SH LH, elbow...