17th Annual ECSS-Congress, Bruges 2012

Abstract details

Abstract-ID: 1390
Session: [PO-CPP-13] Neuromuscular Physiology 1
Lecture room: Gallery
Date & time: 07.07.2016 / -
Title of the paper: Compression with vantage supporter on thigh prevents hamstring muscle cramps after maximum contraction
Authors: Tanimoto, M., Shirosai, M.
Institution: Kinki University
Department: Biology- Oriented Science and Technology
Country: Japan
Abstract text Introduction Vantage supporters that compress muscles are known to have some advantages such as prevention of muscle strain injury, relief from injury pain, and prevention of muscle cramps. These advantages, however, are hard to verify in terms of specific effects. In this study, we discovered a hamstring muscle cramp induction method. We investigate the effect of compression with a vantage supporter in preventing muscle cramps using this muscle cramp induction method. Method Ten healthy men performed maximum voluntary isometric knee flex contraction (knee flex MVC) at 70 degree knee angle in a prone l position for 5sec., relaxed in this angle for 5sec. and relaxed in full extended angle with and without vantage supporter compression as a muscle cramp induction experiment. The vantage was wrapped around the thigh and compression pressure was regulated at 40-50mmHg. Hamstring muscles [biceps femoris long head (BFl), biceps femoris short head (BFs), semitendinosus muscle (ST), semimembranosus muscle (SM)] activity levels during relax phase after maximum contraction and subjective assessment for hamstring muscle cramp (5: hard, 4: ordinary 3: somewhat, 2: near, 1: none) were used as an evaluation index of muscle cramps. The subjects performed knee flexion isotonic exercise [10-repetition maximum (10RM) 5 sets] 24 hours prior to this muscle cramp experiment in order to induce hamstring muscle cramps. The muscle cramp experiments with and without compression were executed in a random order. The experiments were separated by intervals of over 30min. Result Root-mean-square (RMS) of electromyography (EMG) in average 4 hamstring muscles during relax phase after maximum contraction normalized by MVC without compression was derived as evaluation index. This RMS value with 40-50mmHg compression was significantly lower than that without compression (0.100.11 vs 0.230.16). Subjective assessment for hamstring muscle cramps with compression was significantly lower than that without compression (1.80.8 vs 4.60.6). There were no significant differences either in knee flexion force or RMS of EMG in knee flex MVC between with and without compression. There were no significant differences in RMS of EMG either at rest before knee flex MVC or at rest after knee full extend between with and without compression. Conclusion 40-50mmHg compression with vantage supporter on thigh prevents hamstring muscle cramps after maximum contraction. References Hoffman MD1, Stuempfle KJ2. Sports Med Open. Muscle Cramping During a 161-km Ultramarathon: Comparison of Characteristics of Those With and Without Cramping. 2015;1(1):8. Epub 2015 May 21.
Topic: Neuromuscular Physiology
Keyword I: muscle cramps
Keyword II: supporter compression
Keyword III: muscle activity level