sports medicine journal articles
The time trial (TT) or downhill (DH) position (Figure 1) in cycling, which is different from general riding form, is used in time trial road races or triathlons to decrease air resistance and achieve faster speeds. In the TT or DH position, the rider’s neck is extended and his or her body is strained while racing, and some athletes develop neck pain or headache. Most cases of neck pain may be caused by fatigue due to sustained muscular stress, but there may be some risk of myelopathy in some cases.
Triathlons involve different distances, and there are also many different styles of bicycle; likewise, different athletes have different racing experiences and different body conditions. However, the TT position or DH position is common and many cyclists can use DH bars for faster speed.
Left Ventricular Function Improve after Bench Press: A Speckle Tracking and 3D Echocardiography Study
Speckle tracking echo cardiography is introducing new hypotheses about the patho physiology of cardiovascular elite athlete. The Speckle Tracking allows us to evaluate the strain (S), the strain rate (SR), tissue velocities and displacement; being it less influenced by the angle of study, or by the load nor sex, nor they age or systolic blood pressure values. Ventricular remodeling that athlete produce is very variable, depending on the type of sport, age, gender, time or type of training, race or genetics. We consider that there are two types of remodeled, concentric and eccentric.
Associations between Physical Activity and Submaximal Cardiorespiratory and Pulmonary Responses in Men
Habitual physical activity (PA) is associated with higher cardio respiratory fitness values, but additional information is needed on the contributions of specific types and amounts of PA. Therefore the main aim of this study was to analyze the heart and lung function of a large cohort of men and compare these outcomes with various modes and volumes of PA. We used data from 30,594 men from the Aerobics Center Longitudinal Study who were categorized into sedentary, swimmer, walker, and runner groups using self-report PA data collected during 1970-2005.
Additional PA categories using MET-minutes/week were used to group men into 5 distinct levels of activity (0 MET-min, 1-499 MET-min, 500-999 MET-min, 1000-1499 MET-min, and ? 1500 MET-min). Each participant also completed a maximal treadmill exercise test to quantify their fitness level. Cross-sectional analyses included general linear modeling and multiple comparisons adjusted for age, smoking status, and histories of myocardial infarction, stroke, diabetes, and hypertension. Results: A dose-response linear effect was found for heart function variables across PA MET-min categories.
The aim of this study was to assess the reliability of a novel field test of critical running speed (CS). Ten trained male distance runners completed a familiarisation trial plus three separate experimental trials on a standard 400 m athletics track. Each trial consisted of three distances (1200, 2400 and 3600 metres) that were selected to produce finishing times in the region of 3, 7 and 12 minutes respectively. Participants were instructed to cover the set distance in the fastest time possible. Participants rested for 30 minutes between efforts. Data were modelled using the linear distance-time model, described by the equation: d = (CS x t) + ARC, where: d = distance run (m), t = running time (s), and ARC = anaerobic running capacity (m).
Dynamic Valgus Instability of the Knee due to Chronic Medial Collateral Ligament Laxity as a Cause of Recurrent Patella Dislocation
Recurrent patella dislocation can be caused by bony abnormalities, such as patella alta, increased tibial tubercle lateralization, trochlea dysplasia, excessive femoral neck anteversion and external tibial torsion. It can also be caused by soft tissue abnormalities such as a ruptured medial patellofemoral ligament (MPFL) or a weak vastus medialis obliquus. It has been reported in the literature that acute lateral dislocation of the patella can be associated with proximal injury to the medial collateral ligament (MCL).
A 26-year-old male pro footballer presented to our institution with a history of recurrent patella dislocation. He had a previous attempted medial capsular plication and MPFL repair at another institution 3 years prior. His last dislocation was a month prior and occurred as a valgus force was applied to his knee when a player landed on him as he was tackled.