The H-reflex as an important indicator in kinesiology
Journal Title: Human Movement - Year 2016, Vol 17, Issue 2
Abstract
Hoffmann’s reflex (the H-reflex) is an electrically-induced reflex that is analogous to the mechanically-induced stretch reflex controlled by the spinal cord. The most common measurements performed concerns the electrical response of the soleus muscle to electrical stimulation in the tibial nerve. The response is induced by a discharge occurring in a motoneuron. The latency time of the H-reflex for the soleus muscle amounts to 30–40 ms. An increase in the strength of the stimulus induces a direct response from the muscle, i.e. the M-wave. The latency time of the M-wave amounts to 4–5 ms. A sport training may affect the parameters of the H-reflex. The Hmax/Mmax ratio is the highest among persons engaged in endurance sports and the lowest among those practising speed and strength sports. A decreased amplitude of the H-reflex characterises the level of the central fatigue, while a decrease in the M-wave amplitude is attributed to the peripheral fatigue. Usually, a decrease in Hmax/Mmax ratio is observed post-exercise. Different times of recovery were reported in the literature. No clear quantitative laws have yet been established that govern the course of the reflex as a result of fatigue. The H-reflex still remains within the scope of the interests of kinesiology as a valuable source of information about the reflex functions in the human motor system.
Authors and Affiliations
Jan Gajewski, Joanna Mazur-Różycka
Keywords
Related Articles
- EP ID EP133640
- DOI 10.1515/humo-2016-0018
- Views 394
- Downloads 0
EFFECT OF SELF-MANAGEMENT EDUCATION VERSUS QUADRICEPS STRENGTHENING EXERCISES ON PAIN AND FUNCTION IN PATIENTS WITH KNEE OSTEOARTHRITIS
Purpose. To investigate and compare the effects of 6-week self-management education (SME) and quadriceps strengthening exercises (QSE) on pain and disability in individuals with knee osteoarthritis (OA). Methods. The tot...
The anthropometric characteristics of futsal players compared with professional soccer players
Purpose. The aim of the study was to compare the morphological characteristics of experienced futsal players with professional soccer players. Methods. The research sample included 22 university futsal players and 22 pro...
Nordic Walking – a new form of adapted physical activity (a literature review)
Purpose. The purpose of this study was to analyze scientific evidence on the effects that Nordic Walking (NW) has on the human body. Basic procedures. A comprehensive search of computer databases (MEDLINE/PubMed, CINAHL,...
Prediction of VO2max based on age, body mass, and resting heart rate
Purpose. The aim of the present study was to develop a non-exercise regression model for predicting maximal oxygen uptake (VO2max) using age, body mass, and resting heart rate as predictor variables. Methods. The VO2max...
Exercise or relaxation? Which is more effective in improving the emotional state of pregnant women?
Purpose. The aim of this study was to compare the changes in emotional states in pregnant women after completing a relaxation session and a one-off physical exercise class. Methods. The study included 139 pregnant women...