Publications by authors named "N J Place"
Introduction: Women have generally lower body size and lean- to fat-mass ratio, lower maximal anaerobic power due to a lower muscle mass, and fewer fast-twitch fibers, although they can show higher resistance to fatigue or greater metabolic flexibility than men. These factors are well known and explain the sex differences in endurance sports such as distance running (10%-12%). Several of these factors-particularly the differences in body composition and skeletal-muscle characteristics-may directly impact vertical displacement and uphill performance.
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- The study looked at how 12 weeks of stopping and then restarting training affected a 53-year-old master triathlete's performance.
- After 12 weeks without training (detraining), the athlete showed significant declines in key fitness measures like oxygen consumption, peak power output, and muscle strength, alongside increased body fat.
- After retraining for another 12 weeks, most fitness metrics improved back to previous levels, but running economy and lean muscle mass did not fully recover.
Purpose: The purpose of this study was to investigate the effect of vastus lateralis (VL) selective fatigue induced by neuromuscular electrical stimulation (NMES) on knee extensor electromyographic (EMG) activity during a sustained submaximal isometric contraction.
Methods: Thirteen healthy men (28 ± 5 years) completed two experimental sessions in which either the VL was pre-fatigued for 17 min (NMES session) or no intervention was performed (control session, CTRL). Subsequently, participants were asked to sustain an isometric knee extension at 20 % of maximal voluntary contraction (MVC) torque until task failure.
Article Synopsis
- WPHF NMES is effective in generating extra force through reflexive recruitment of motor units, but effects vary between muscle groups.
- Plantar flexors produced greater extra force and sustained EMG activity compared to elbow flexors across most tested parameters, indicating their responsiveness to NMES.
- Inter-muscle differences in extra force and EMG activity may be influenced by factors like peripheral nerve structure and muscle function, suggesting NMES is particularly beneficial for lower limb muscles.