Relationship of quadriceps femoris muscle strength and endurance with selected anthropometric indices

Ultrasound measurement of rectus femoris cross-sectional area and the relationship with quadriceps strength in COPD.

BACKGROUND Quadriceps weakness and loss of muscle mass predict mortality in chronic obstructive pulmonary disease (COPD). It was hypothesised that a reduced quadriceps cross-sectional area could be detected by ultrasound in patients with COPD compared with healthy subjects, and that measurements relate to strength and fat-free mass (FFM). METHODS Rectus femoris muscle cross-sectional area (RF...

Improvement in isometric strength of the quadriceps femoris muscle after training with electrical stimulation.

The purpose of this investigation was to determine if training isometrically with electrical stimulation (ES) alone would significantly increase isometric strength of the quadriceps femoris muscle. The relationships between the strength changes and the relative force and duration of training contractions were also studied. An experimental group (Group 1) and a control group (Group 2), 12 subjec...

Analysis of three different equations for predicting quadriceps femoris muscle strength in patients with COPD *

OBJECTIVE To compare equations for predicting peak quadriceps femoris (QF) muscle force; to determine the agreement among the equations in identifying QF muscle weakness in COPD patients; and to assess the differences in characteristics among the groups of patients classified as having or not having QF muscle weakness by each equation. METHODS Fifty-six COPD patients underwent assessment of p...

Stimulation Frequency in Human Quadriceps Femoris Muscle

Muscle-specific atrophy of the quadriceps femoris with aging.

We examined the size of the four muscles of the quadriceps femoris in young and old men and women to assess whether the vastus lateralis is an appropriate surrogate for the quadriceps femoris in human studies of aging skeletal muscle. Ten young (24 +/- 2 yr) and ten old (79 +/- 7 yr) sedentary individuals underwent magnetic resonance imaging of the quadriceps femoris after 60 min of supine rest...