Biological sex is a primary determinant of athletic performance because of fundamental sex
differences in anatomy and physiology dictated by sex chromosomes and sex hormones …

Muscle strength, the maximal force-generating capacity of a muscle or group of muscles, is
regularly assessed in physiological experiments and clinical trials. An understanding of the …

Motoneurons receive synaptic inputs from tens of thousands of connections that cause
membrane potential to fluctuate continuously (synaptic noise), which introduces variability in …

The purpose of this study was to evaluate the relationship between the variability in the
motor unit inter-pulse interval and force steadiness at submaximal and maximal force …

To expose cortical involvement in age-related changes in motor performance, we compared
steadiness (force fluctuations) and fatigability of submaximal isometric contractions with the …

Neuromuscular noise is a determining factor in the control of isometric force steadiness (FS),
quantified as coefficient of variation (CV) of force around a preestablished target output. In …

Purpose These studies determined (1) age-and sex-related differences in steadiness of
isometric contractions when high cognitive demand was imposed across a range of forces …

The rectified surface EMG signal is commonly used as an estimator of the neural drive to
muscles and therefore to infer sources of synaptic input to motor neurons. Loss of EMG …

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 …

Background Compartmentalized responses in motor unit (MU) activity of the short head (SH)
and long head (LH) of the biceps brachii are observed following forearm position change …