PMC:4630263 / 26311-27929 JSONTXT

{"project":"TEST0","denotations":[{"id":"26527349-223-228-1499048","span":{"begin":380,"end":381},"obj":"[\"20080441\"]"},{"id":"26527349-123-129-1499049","span":{"begin":507,"end":509},"obj":"[\"20601917\"]"},{"id":"26527349-97-103-1499050","span":{"begin":609,"end":611},"obj":"[\"21093360\"]"},{"id":"26527349-214-220-1499051","span":{"begin":726,"end":728},"obj":"[\"20591729\"]"},{"id":"26527349-197-203-1499052","span":{"begin":1037,"end":1039},"obj":"[\"16481825\"]"},{"id":"26527349-201-207-1499053","span":{"begin":1041,"end":1043},"obj":"[\"19434246\"]"}],"text":"Due to the measurement method and/or technical factors, oVEMP is more valuable in assessing vestibular function in patients with headache compared to cVEMP. During cVEMP recordings, amplitude-related parameters change according to the degree of tonic contraction of the SCM showing a direct correlation; the more tonic the muscle tension, the larger the cVEMP amplitude response [4]. Decreased response rate and amplitude or prolonged latencies on cVEMP and oVEMP occur with age increase over 60 years [24, 26]. Regarding the influence of gender on oVEMPs, one study found oVEMPs to be independent of gender [31], whereas another study reported that the mean oVEMP amplitude in males was significantly larger than in females [25]. Thus, in our study, we only included females 20–60 years of age based on these known age and gender effects. To control the amount of muscle tension between right and left muscles, we used a feedback method with a blood pressure manometer and analyzed VEMP parameters following EMG rectification in cVEMP [27, 46]. Many patients with primary headache disorders, such as TTH and migraine, also have accompanying pericranial, neck and shoulder muscle tenderness and/or associated myofascial pain syndrome. These conditions can affect muscle tension or posture during cVEMP measurements. Thus, the cVEMP method may provide inaccurate information in patients with migraine and TTH because the degree of muscle contraction affects the cVEMP result and its interpretation. Consequently, oVEMP may be the more sensitive method for evaluating the vestibular system in primary headache disorders."}

{"project":"2_test","denotations":[{"id":"26527349-20080441-60553930","span":{"begin":380,"end":381},"obj":"20080441"},{"id":"26527349-20601917-60553931","span":{"begin":507,"end":509},"obj":"20601917"},{"id":"26527349-21093360-60553932","span":{"begin":609,"end":611},"obj":"21093360"},{"id":"26527349-20591729-60553933","span":{"begin":726,"end":728},"obj":"20591729"},{"id":"26527349-16481825-60553934","span":{"begin":1037,"end":1039},"obj":"16481825"},{"id":"26527349-19434246-60553935","span":{"begin":1041,"end":1043},"obj":"19434246"}],"text":"Due to the measurement method and/or technical factors, oVEMP is more valuable in assessing vestibular function in patients with headache compared to cVEMP. During cVEMP recordings, amplitude-related parameters change according to the degree of tonic contraction of the SCM showing a direct correlation; the more tonic the muscle tension, the larger the cVEMP amplitude response [4]. Decreased response rate and amplitude or prolonged latencies on cVEMP and oVEMP occur with age increase over 60 years [24, 26]. Regarding the influence of gender on oVEMPs, one study found oVEMPs to be independent of gender [31], whereas another study reported that the mean oVEMP amplitude in males was significantly larger than in females [25]. Thus, in our study, we only included females 20–60 years of age based on these known age and gender effects. To control the amount of muscle tension between right and left muscles, we used a feedback method with a blood pressure manometer and analyzed VEMP parameters following EMG rectification in cVEMP [27, 46]. Many patients with primary headache disorders, such as TTH and migraine, also have accompanying pericranial, neck and shoulder muscle tenderness and/or associated myofascial pain syndrome. These conditions can affect muscle tension or posture during cVEMP measurements. Thus, the cVEMP method may provide inaccurate information in patients with migraine and TTH because the degree of muscle contraction affects the cVEMP result and its interpretation. Consequently, oVEMP may be the more sensitive method for evaluating the vestibular system in primary headache disorders."}