\u672c\u7814\u7a76\u306f\u3001\u30a2\u30b9\u30ea\u30fc\u30c8\u3068\u6d3b\u52d5\u7684\u306a\u6210\u4eba\u3092\u5bfe\u8c61\u306b\u30012 \u7a2e\u985e\u306e\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u904b\u52d5\uff08INHE\u3001BHE\uff09\u4e2d\u306e\u30cf\u30e0\u30b9\u30c8\u30ea\u30f3\u30b0\u30b9\u3068\u4f53\u5e79\u306e\u795e\u7d4c\u7b4b\u6d3b\u6027\u5316\u30d1\u30bf\u30fc\u30f3\u3092\u8868\u9762\u7b4b\u96fb\u56f3\u3067\u6bd4\u8f03\u3057\u305f\u3002\u30a2\u30b9\u30ea\u30fc\u30c8\u306f BHE \u4e2d\u306b\u5927\u817f\u4e8c\u982d\u7b4b\u9577\u982d\uff08BFlh\uff09\u306e\u6d3b\u52d5\u304c\u9ad8\u304f BFlh \u512a\u4f4d\u306e\u50be\u5411\u3092\u793a\u3057\u305f\u4e00\u65b9\u3001\u975e\u30a2\u30b9\u30ea\u30fc\u30c8\u306f\u534a\u8171\u69d8\u7b4b\u3078\u306e\u4f9d\u5b58\u5ea6\u3084\u7279\u5b9a\u306e\u6761\u4ef6\u4e0b\u3067\u306e\u4f53\u5e79\u7b4b\u6d3b\u52d5\u304c\u9ad8\u304b\u3063\u305f\u3002\u904b\u52d5\u6b74\u306e\u9055\u3044\u304c\u3001\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u8ca0\u8377\u6642\u306e\u5354\u8abf\u904b\u52d5\u6226\u7565\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u793a\u5506\u3055\u308c\u305f\u3002<\/p>\n
This study compared neuromuscular activation patterns of the hamstrings and trunk during two eccentric exercises\u2014the Inclined Nordic Hamstring Exercise (INHE) and Bilateral Hip Extension (BHE)\u2014between 10 trained athletes and 15 physically active nonathletes using surface electromyography (sEMG). Results showed distinct activation patterns between groups despite comparable overall activity levels. Athletes exhibited higher root mean square (RMS) values in the biceps femoris long head (BFlh) during BHE and a tendency toward BFlh-dominant activation.
\nConversely, active nonathletes showed significantly higher median frequency (MF) values, greater reliance on the semitendinosus (ST) with lower BFlh\/ST ratios, and higher superficial trunk muscle activation under specific conditions. These findings suggest that training status is associated with differences in task-specific hamstring and trunk coordination strategies during eccentric loading, highlighting the importance of tailored training and rehabilitation programs.<\/p>\n
\u30cf\u30e0\u30b9\u30c8\u30ea\u30f3\u30b0\u30b9\u306e\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\uff08\u4f38\u5f35\u6027\uff09\u904b\u52d5\u306f\u3001\u30b9\u30dd\u30fc\u30c4\u73fe\u5834\u306e\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u3084\u30ea\u30cf\u30d3\u30ea\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u304a\u3044\u3066\u5e83\u304f\u7528\u3044\u3089\u308c\u3066\u3044\u308b\u3002\u3057\u304b\u3057\u3001\u500b\u4eba\u306e\u7af6\u6280\u30ec\u30d9\u30eb\u3084\u904b\u52d5\u6b74\uff08\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u30b9\u30c6\u30fc\u30bf\u30b9\uff09\u306e\u9055\u3044\u304c\u3001\u3053\u308c\u3089\u904b\u52d5\u4e2d\u306e\u795e\u7d4c\u7b4b\u6d3b\u6027\u5316\u30d1\u30bf\u30fc\u30f3\u306b\u3069\u306e\u3088\u3046\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u308c\u307e\u3067\u672a\u89e3\u660e\u3067\u3042\u3063\u305f \u3002<\/p>\n
Eccentric hamstring exercises are widely used in training and rehabilitation settings. However, how neuromuscular activation patterns vary according to an individual’s training status remains unclear.<\/p>\n
\u672c\u7814\u7a76\u306b\u3088\u308a\u3001\u65e5\u9803\u306e\u7dcf\u6d3b\u52d5\u91cf\u304c\u540c\u7a0b\u5ea6\u3067\u3042\u3063\u3066\u3082\u3001\u30a2\u30b9\u30ea\u30fc\u30c8\u3068\u6d3b\u52d5\u7684\u306a\u6210\u4eba\u3067\u306f\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u904b\u52d5\u4e2d\u306e\u795e\u7d4c\u7b4b\u6d3b\u52d5\u30d1\u30bf\u30fc\u30f3\u304c\u7570\u306a\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u306b\u306a\u3063\u305f \u3002\u30a2\u30b9\u30ea\u30fc\u30c8\u306f BHE \u4e2d\u306b\u5927\u817f\u4e8c\u982d\u7b4b\u9577\u982d\uff08BFlh\uff09\u306e\u6d3b\u52d5\u304c\u9ad8\u304f\u3001BFlh \u512a\u4f4d\u306e\u6d3b\u6027\u5316\u50be\u5411\u3092\u793a\u3057\u305f \u3002\u4e00\u65b9\u3001\u6d3b\u52d5\u7684\u306a\u6210\u4eba\u306f\u534a\u8171\u69d8\u7b4b\uff08ST\uff09\u3078\u306e\u4f9d\u5b58\u5ea6\u304c\u9ad8\u304f\u3001\u7279\u5b9a\u306e\u30bf\u30b9\u30af\u6761\u4ef6\u4e0b\u3067\u8868\u5c64\u4f53\u5e79\u7b4b\u306e\u6d3b\u6027\u5316\u304c\u3088\u308a\u9ad8\u304f\u306a\u308b\u3053\u3068\u304c\u793a\u3055\u308c\u305f \u3002<\/p>\n
The study revealed distinct neuromuscular activation patterns between athletes and physically active nonathletes, despite comparable overall activity levels. Athletes exhibited higher BFlh activation during BHE and a tendency toward BFlh-dominant activation. In contrast, physically active nonathletes demonstrated a greater reliance on the ST and higher activation of superficial trunk muscles under specific task conditions.<\/p>\n
2 \u7a2e\u985e\u306e\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u904b\u52d5\uff08INHE \u3068 BHE\uff09\u6642\u306b\u304a\u3051\u308b\u30cf\u30e0\u30b9\u30c8\u30ea\u30f3\u30b0\u30b9\u304a\u3088\u3073\u4f53\u5e79\u7b4b\u7fa4\u306e\u591a\u89d2\u7684\u306a\u795e\u7d4c\u7b4b\u6d3b\u52d5\uff08RMS\u3001\u4e2d\u592e\u5024\u5468\u6ce2\u6570\u3001\u304a\u3088\u3073 BFlh\/ST \u6d3b\u6027\u5316\u6bd4\u7387\uff09\u3092\u3001\u8868\u9762\u7b4b\u96fb\u56f3\uff08sEMG\uff09\u3092\u7528\u3044\u3066\u975e\u4fb5\u8972\u7684\u306b\u8a08\u6e2c\u30fb\u8a55\u4fa1\u3057\u3001\u500b\u4eba\u9593\u306b\u304a\u3051\u308b\u591a\u7b4b\u5354\u8abf\u6226\u7565\u3092\u6bd4\u8f03\u5206\u6790\u3059\u308b\u624b\u6cd5\u3092\u7528\u3044\u305f \u3002<\/p>\n
A comparative evaluation method utilizing surface electromyography (sEMG) to examine and contrast multi-muscle coordination strategies (including RMS, median frequency, and the BFlh\/ST activation ratio) during specific eccentric tasks (INHE and BHE) across different populations.<\/p>\n
\u672c\u7814\u7a76\u306e\u77e5\u898b\u306f\u3001\u30b9\u30dd\u30fc\u30c4\u73fe\u5834\u306b\u304a\u3051\u308b\u50b7\u5bb3\u4e88\u9632\u3084\u30ea\u30cf\u30d3\u30ea\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u6700\u9069\u5316\u306b\u8ca2\u732e\u3059\u308b\u3002\u3059\u3079\u3066\u306e\u4eba\u306b\u4e00\u5f8b\u306e\u904b\u52d5\u3092\u51e6\u65b9\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u5bfe\u8c61\u8005\u306e\u904b\u52d5\u80cc\u666f\uff08\u30a2\u30b9\u30ea\u30fc\u30c8\u304b\u4e00\u822c\u6210\u4eba\u304b\uff09\u306b\u5fdc\u3058\u305f\u3001\u3088\u308a\u52b9\u679c\u7684\u3067\u30c6\u30fc\u30e9\u30fc\u30e1\u30a4\u30c9\u306a\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u69cb\u7bc9\u304c\u53ef\u80fd\u3068\u306a\u308b \u3002<\/p>\n
These findings provide a scientific basis for optimizing injury prevention and rehabilitation. It suggests that hamstring conditioning and eccentric exercise prescriptions should be customized based on an individual’s athletic background rather than utilizing a one-size-fits-all approach.<\/p>\n
\u672c\u7814\u7a76\u306e\u7d50\u679c\u306f\u95a2\u9023\u6027\u3092\u793a\u3059\u8a18\u8ff0\u7684\u306a\u3082\u306e\u3067\u3042\u308b\u305f\u3081\u3001\u4eca\u5f8c\u306f\u3053\u308c\u3089\u306e\u795e\u7d4c\u7b4b\u6d3b\u52d5\u30d1\u30bf\u30fc\u30f3\u306e\u9055\u3044\u304c\u751f\u3058\u308b\u56e0\u679c\u95a2\u4fc2\u306e\u89e3\u660e\u3001\u9577\u671f\u7684\u306a\u30c8\u30ec\u30fc\u30cb\u30f3\u30b0\u9069\u5fdc\u306b\u3088\u308b\u5909\u5316\u306e\u8ffd\u8de1\u3001\u304a\u3088\u3073\u5b9f\u969b\u306e\u50b7\u5bb3\u4e88\u9632\u52b9\u679c\u306b\u5bfe\u3059\u308b\u76f4\u63a5\u7684\u306a\u691c\u8a3c\u304c\u5fc5\u8981\u3067\u3042\u308b \u3002<\/p>\n
Since the current findings are associative and descriptive, future longitudinal research is needed to establish causal relationships, investigate long-term training adaptations, and evaluate the direct efficacy of these patterns on injury prevention.<\/p>\n
\u65e5\u9803\u306e\u904b\u52d5\u91cf\u304c\u540c\u7a0b\u5ea6\u3067\u3042\u3063\u3066\u3082\u3001\u30a2\u30b9\u30ea\u30fc\u30c8\u3068\u4e00\u822c\u306e\u6d3b\u52d5\u7684\u306a\u6210\u4eba\u3067\u306f\u3001\u30a8\u30ad\u30bb\u30f3\u30c8\u30ea\u30c3\u30af\u8ca0\u8377\u306b\u5bfe\u3059\u308b\u8eab\u4f53\uff08\u30cf\u30e0\u30b9\u30c8\u30ea\u30f3\u30b0\u30b9\u3068\u4f53\u5e79\uff09\u306e\u4f7f\u3044\u65b9\u304c\u7570\u306a\u308b\u3053\u3068\u304c\u5206\u304b\u308a\u307e\u3057\u305f\u3002\u672c\u77e5\u898b\u304c\u3001\u73fe\u5834\u306e\u30b3\u30fc\u30c1\u3084\u7406\u5b66\u7642\u6cd5\u58eb\u306e\u7686\u69d8\u304c\u3088\u308a\u5b89\u5168\u3067\u52b9\u679c\u7684\u306a\u904b\u52d5\u51e6\u65b9\u3092\u884c\u3046\u4e00\u52a9\u3068\u306a\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n
Our study demonstrates that even with similar overall physical activity levels, athletes and active adults employ different muscle coordination strategies during eccentric loading. We hope these findings will help coaches and therapists optimize task-specific exercise prescriptions for safer and more effective training.<\/p>\n
\u96d1\u8a8c\u540d\uff0fJournal\uff1a BMC Sports Science, Medicine and Rehabilitation<\/p>\n
\u8ad6\u6587\u540d\uff0fTitle\uff1a NEUROMUSCULAR ACTIVATION PATTERNS OF THE HAMSTRINGS AND TRUNK DURING ECCENTRIC EXERCISE IN ATHLETES AND PHYSICALLY ACTIVE ADULTS<\/p>\n
\u57f7\u7b46\u8005\u540d\u30fb\u6240\u5c5e\u6a5f\u95a2\u540d\uff0fAuthors and Affiliated Organisation\uff1a
\nYanan You (Graduate School of Sport Sciences, Waseda University)
\nNorikazu Hirose<\/a> (Faculty of Sport Sciences, Waseda University)
\nDai Sugimoto (Division of Sports Medicine, Boston Children\u2019s Hospital, Boston, MA, USA & The Micheli Center for Sports Injury Prevention, Waltham, MA, USA)<\/p>\n