Variation in the determinants of power of chemically skinned type I rat soleus muscle fibres.

We explored to which extent maximal velocity of shortening (Vmax), force per cross-sectional area (specific tension, Po) and curvature of the force-velocity relationship (a/Po in the Hill equation) contribute to differences in peak power of single, chemically skinned rat type I fibres. Force-velocity relationships were determined from isotonic contractions of 94 maximally activated fibres. Peak power (±SD) was 3.

Patellar tendinopathy in master track and field athletes: influence of impact profile, weight, height, age and gender.

Purpose: Patellar tendinopathy causes significant morbidity in professional and recreational athletes. Despite the relevance of the problem, its causative factors remain poorly understood. The purpose of this cross-sectional study is to evaluate the influence of age, gender, weight, height and impact profile on developing patellar tendinopathy in master track and field athletes.

Changes in contractile properties of skinned single rat soleus and diaphragm fibres after chronic hypoxia.

Hypoxia may be one of the factors underlying muscle dysfunction during ageing and chronic lung and heart failure. Here we tested the hypothesis that chronic hypoxia per se affects contractile properties of single fibres of the soleus and diaphragm muscle. To do this, the force-velocity relationship, rate of force redevelopment and calcium sensitivity of single skinned fibres from normoxic rats and rats exposed to 4 weeks of hypobaric hypoxia (410 mmHg) were investigated.

No influence of age, gender, weight, height, and impact profile in achilles tendinopathy in masters track and field athletes.

Background: Achilles tendinopathy is commonly reported by athletes involved in activities that include running and jumping. Despite the prevalence of the problem, causative factors in Achilles tendinopathy remain poorly understood.

Hypothesis: In Masters track and field athletes, there is no influence of age, gender, weight, height, and impact profile in developing Achilles tendinopathy.

Forearm and tibial bone measures of distance- and sprint-trained master cyclists.

Purpose: Cycling is very popular; however, it is often believed to be associated with below average bone mass. This study compared bone measures of sprint- and distance-trained cyclists competing at World Master Track Championships, along with sedentary controls (30-82 yr), and examined the associations of bone measures with age.

Methods: Radius and tibia epiphyseal and shaft bone mineral density (BMD), bone mineral content (BMC), and cross-sectional area along with shaft polar moment of resistance (RPol) and endocortical/periosteal circumferences were assessed by peripheral quantitative computed tomography.