Applied human science : journal of physiological anthropology最新文献

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Effects of changes in arousal level by continuous light stimulus on contingent negative variation (CNV). 连续光刺激唤醒水平变化对偶然负变异的影响。
Applied human science : journal of physiological anthropology Pub Date : 1997-03-01 DOI: 10.2114/jpa.16.55
S Higuchi, S Watanuki, A Yasukouchi, M Sato
{"title":"Effects of changes in arousal level by continuous light stimulus on contingent negative variation (CNV).","authors":"S Higuchi,&nbsp;S Watanuki,&nbsp;A Yasukouchi,&nbsp;M Sato","doi":"10.2114/jpa.16.55","DOIUrl":"https://doi.org/10.2114/jpa.16.55","url":null,"abstract":"<p><p>The purpose of the present study was to investigate an inverted-U relationship between contingent negative variation (CNV) and arousal level which was influenced by extraneous environment. As an extraneous stimulant, stimulation by light was adopted, and five levels of luminance conditions, 10 cd/m2, 100 cd/m2, 320 cd/ m2, 1,000 cd/m2, and 1,800 cd/m2 were provided randomly. Under five luminance conditions, seven subjects who had been accustomed a measurement of CNV executed simple reaction time tasks to evoke CNV. Outside CNV, spontaneous EEG prior to S1 was measured as an indicator for arousal level. As a result, a negative correlation existed between the logarithm of luminance and the relative power value of alpha waves at Fz. Otherwise, an increase in luminance caused an increase in CNV amplitude until the luminance level reached 320 cd/m2, beyond which however CNV amplitude was found to decrease. These tendencies were most remarkable in the phase of early CNV at Fz. The low amplitude of early CNV seen in the high luminance conditions was inferred to have been induced by excessive arousal state because of the low relative power value of alpha waves, while the low amplitude in the low luminance conditions was inferred to have been induced by low arousal state because of the high relative power value of alpha waves. However, changes in arousal level by light stimulus caused no effect on reaction time. From these findings, it was suggested that a definite \"inverted-U\" relationship existed between the change in arousal level by light stimulation and resultant CNV, and that it could be discriminated as to whether reduction in CNV is caused by excessive arousal effect of environment by analyzing spontaneous EEG preceding S1.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 2","pages":"55-60"},"PeriodicalIF":0.0,"publicationDate":"1997-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.55","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20110373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 23
A Symposium on the Comparative Differences Between the Genders and Physiological Anthoropology 性别差异与生理人类学比较研讨会
Applied human science : journal of physiological anthropology Pub Date : 1997-03-01 DOI: 10.2114/JPA.16.83
T. Akamatsu
{"title":"A Symposium on the Comparative Differences Between the Genders and Physiological Anthoropology","authors":"T. Akamatsu","doi":"10.2114/JPA.16.83","DOIUrl":"https://doi.org/10.2114/JPA.16.83","url":null,"abstract":"","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"83-84"},"PeriodicalIF":0.0,"publicationDate":"1997-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/JPA.16.83","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68452621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Drinking habit as a base for blood pressure elevation--difference in epidemiological significance by beverage type. 饮酒习惯作为血压升高的基础——不同饮料类型的流行病学意义差异
Applied human science : journal of physiological anthropology Pub Date : 1997-03-01 DOI: 10.2114/jpa.16.47
Y Takashima, A Kokaze, Y Iwase, E Okada, M Ishikawa, C Ikeda, I Tomizawa, Y Takeuchi, Y Orido, S Tsugane, M Yoshida, Y Takagi, N Tanaka, S Watanabe, T Akamatsu
{"title":"Drinking habit as a base for blood pressure elevation--difference in epidemiological significance by beverage type.","authors":"Y Takashima,&nbsp;A Kokaze,&nbsp;Y Iwase,&nbsp;E Okada,&nbsp;M Ishikawa,&nbsp;C Ikeda,&nbsp;I Tomizawa,&nbsp;Y Takeuchi,&nbsp;Y Orido,&nbsp;S Tsugane,&nbsp;M Yoshida,&nbsp;Y Takagi,&nbsp;N Tanaka,&nbsp;S Watanabe,&nbsp;T Akamatsu","doi":"10.2114/jpa.16.47","DOIUrl":"https://doi.org/10.2114/jpa.16.47","url":null,"abstract":"<p><p>To investigate whether blood pressure differs by taking preferred alcoholic beverage among habitual drinkers, systolic and diastolic blood pressure (SBP, DBP) were compared among groups with different beverage types in 563 middle-aged Japanese males using data from a cross-sectional health survey conducted from February, 1989 through March, 1991 in five areas of Japan. Mean values of SBP and DBP, adjusted for residence, age and body mass index (BMI), were significantly greater in 'exclusively sake' drinkers (adjusted SBP: 127.2 mmHg, adjusted DBP: 83.0 mmHg) and in 'exclusively shochu' drinkers (adjusted SBP: 127.5 mmHg, adjusted DBP: 84.2 mmHg) than in non-drinkers (adjusted SBP: 120.9 mmHg, adjusted DBP: 77.3 mmHg). Adjusted SBP and DBP of 'exclusively beer' drinkers (adjusted SBP: 121.9 mmHg, adjusted DBP: 79.1 mmHg) were significantly (for SBP: p = 0.016, for DBP: p = 0.008) lower than those of 'exclusively sake' drinkers. Similar patterns of blood pressure differences between five beverage types of habitual drinkers were found especially in the group with less than 150 g of weekly ethyl-alcohol consumption. Even after adding ethyl-alcohol consumption as a covariate among 479 habitual drinkers, the significant differences in adjusted SBP and DBP between 'exclusively beer' drinkers and 'exclusively sake' drinkers (for SBP: p = 0.032, for DBP: p = 0.044) were noted. These results may suggest that the effects of drinking on blood pressure differ by beverage type in middle-aged Japanese males.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 2","pages":"47-53"},"PeriodicalIF":0.0,"publicationDate":"1997-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.47","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20110371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
A dynamic model of the human/clothing/environment-system. 一个人/衣服/环境系统的动态模型。
Applied human science : journal of physiological anthropology Pub Date : 1997-03-01 DOI: 10.2114/jpa.16.61
X Xu, J Werner
{"title":"A dynamic model of the human/clothing/environment-system.","authors":"X Xu,&nbsp;J Werner","doi":"10.2114/jpa.16.61","DOIUrl":"https://doi.org/10.2114/jpa.16.61","url":null,"abstract":"<p><p>In this paper a dynamic model of the human/ clothing/environment-system is developed. The human body (controlled system) is subdivided into six segments consisting of the head, trunk, arms, hands, legs and feet. Each segment is further divided into the core, muscle, fat, and skin layer. The afferent signal of the controlling system is composed of the weighted temperatures measured by thermal receptors at sites distributed in the body. The difference between this signal and its threshold activates the thermoregulatory actions: vasomotor changes, metabolic heat production and sweat production. The model considers the competition between skin and muscle blood flow during exercise in hot environments because of limited cardiac capacity, as well as cold induced vasodilatation. Additionally a combined model of heat and mass transfer from the skin through clothing to the environment is developed and incorporated into the thermoregulatory model. The human/clothing model can be used to investigate the interaction between the human body, clothing and environment. The model is validated by comparing the simulation with experimental results under different conditions: heat, cold, exercise, clothing and transient phases. It turns out that the simulation is compatible with the experimental results. We conclude that the model can be applied in a broad range of environmental conditions. Application of the model is easy via a user-friendly interface i.e. a WINDOWS-shell.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 2","pages":"61-75"},"PeriodicalIF":0.0,"publicationDate":"1997-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.61","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20110374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 121
Effect of muscle length on distribution of muscle fiber conduction velocity for M. biceps brachii. 肌肉长度对肱二头肌肌纤维传导速度分布的影响。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.1
K Sakamoto, W Li
{"title":"Effect of muscle length on distribution of muscle fiber conduction velocity for M. biceps brachii.","authors":"K Sakamoto,&nbsp;W Li","doi":"10.2114/jpa.16.1","DOIUrl":"https://doi.org/10.2114/jpa.16.1","url":null,"abstract":"<p><p>The influence of the muscle length on the distribution of muscle fiber conduction velocity (MFCV) was estimated at 3 different elbow angles (90 degrees, 120 degrees and 150 degrees) during the contraction of 30% of isometric maximum voluntary contraction (MVC). Surface electromyogram was recorded in the distal region of m. biceps brachii using a surface array electrode. MFCVs at the different locations from the end-plate to the distal tendon of the muscle were measured directly using the averaging method. MFCVs near the end-plate and the distal tendon of the muscle showed the high values, while MFCVs in the middle region between the end-plate and the distal tendon of the muscle had low values at the same elbow angles. The mean MFCVs in the middle region decreased when the muscle length increased during the contraction of 30% MVC. The middle region length changed when the elbow joint was extended from the elbow angle of 90 degrees to that of 150 degrees. Although previous studies showed the influence of muscle length on MFCV for special regions (like end-plate, tendon, and middle region), MFCV for whole regions, that is, the distribution of MFCV has not been studied for various muscle length. The MFCV for the same region in the some muscle length could not be estimated. In the study, the distribution of MFCV in various muscle length for the contraction of 30% MVC was obtained, and the model with the function including muscle length for the estimation of MFCV was presented.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Heart rate, blood lactate responses and ratings of perceived exertion to 1,000 punches and 1,000 kicks in collegiate karate practitioners. 大学空手道练习者在1000次出拳和1000次踢腿时的心率、血乳酸反应和感觉用力等级。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.9
H Imamura, Y Yoshimura, K Uchida, A Tanaka, S Nishimura, A T Nakazawa
{"title":"Heart rate, blood lactate responses and ratings of perceived exertion to 1,000 punches and 1,000 kicks in collegiate karate practitioners.","authors":"H Imamura,&nbsp;Y Yoshimura,&nbsp;K Uchida,&nbsp;A Tanaka,&nbsp;S Nishimura,&nbsp;A T Nakazawa","doi":"10.2114/jpa.16.9","DOIUrl":"https://doi.org/10.2114/jpa.16.9","url":null,"abstract":"<p><p>The purpose of this study was: 1) to investigate the responses of heart rate (HR), blood lactate and ratings of perceived exertion (RPE) to 1,000 punches and 1,000 kicks in collegiate highly skilled (BB Group) and novice (WB Group) karate practitioners; and, 2) to compare RPE obtained from the subjects to RPE expected by their coaches. The mean values of HR, percent of maximal HR (% HRmax), percent of maximal HR reserve (% MHRR), blood lactate and RPE in 1,000 punches for the BB Group were 102.5 +/- 14.8 beats. min-1, 53.1 +/- 8.5%, 27.1 +/- 12.7%, 0.8 +/- 0.2 mmol.1-1 and 12.2 +/- 1.2 respectively, and for the WB Group were 116.1 +/- 17.9 beats. min-1, 58.1 +/- 7.7%, 35.2 +/- 13.3%, 1.2 +/- 0.6 mmol.1-1 and 12.8 +/- 1.2, respectively. Likewise, the mean values in 1,000 kicks for the BB Group were 127.4 +/- 12.4 beats. min-1, 66.0 +/- 8.0%, 47.0 +/- 12.5%, 1.3 +/- 0.4 mmol.1-1 and 14.2 +/- 1.2, respectively, and for the WB Group were 137.0 +/- 14.4 beats.min-1, 70.1 +/- 7.4%, 52.0 +/- 12.8%, 2.4 +/- 0.8 mmol. 1-1 and 16.3 +/- 1.5, respectively. These responses to 1,000 punches and 1,000 kicks were moderate, and the RPE for 1,000 punches in both BB and WB Groups and for 1,000 kicks in the BB Group were significantly lower than the RPE expected by their coaches.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"9-13"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
Effects of reduction in arousal level caused by long-lasting task on CNV. 长时任务引起的觉醒水平降低对CNV的影响。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.29
S Higuchi, S Watanuki, A Yasukouchi
{"title":"Effects of reduction in arousal level caused by long-lasting task on CNV.","authors":"S Higuchi,&nbsp;S Watanuki,&nbsp;A Yasukouchi","doi":"10.2114/jpa.16.29","DOIUrl":"https://doi.org/10.2114/jpa.16.29","url":null,"abstract":"<p><p>The present study aimed at investigating an inverted-U relationship between contingent negative variation (CNV) and arousal level by examining the effects on CNV of gradually reduced arousal level by long-lasting task. The subjects conducted a simple reaction time task consisting of warning stimuli (S1) and imperative stimuli (S2). This task consisted of 200 trials and lasted about 40 minutes. During this task, spontaneous EEG before S1 and SPL (skin potential level) were measured as indicators for arousal level. The 200 CNV, EEG and SPL data were classified into 5 blocks each of which included 40 trials of data. Analysis was made in seven subjects in whom reduction in the arousal level in long-lasting task was shown by increase in the relative power values of alpha waves before S1 and decrease in the SPL. As a result, the amplitude of early CNV at Fz was observed to increase from the earlier half phase (block 1) to the middle phase (block 3) and to decrease from the middle phase (block 3) to the latter half (block 5). In the middle phase, the amplitude was the greatest. The low amplitude of early CNV in the early half of the task (block 1) was inferred to have been induced by excessive arousal state because of the low relative power values of alpha waves and the high SPL at this time. On the other hand, the low amplitude in the later phase (block 5) was inferred to have been induced by reduction in arousal level because of the high relative power values of alpha waves and the low SPL. These results suggested that CNV amplitude and arousal level was in an inverted-U relationship.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"29-34"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.29","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 17
Kinetics of mixed venous CO2 pressure in incremental-load exercise. 增加负荷运动中混合静脉CO2压动力学。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.15
T Yano
{"title":"Kinetics of mixed venous CO2 pressure in incremental-load exercise.","authors":"T Yano","doi":"10.2114/jpa.16.15","DOIUrl":"https://doi.org/10.2114/jpa.16.15","url":null,"abstract":"<p><p>The purpose of the present study was to examine the kinetics of mixed venous CO2 pressure (PvCO2) in incremental-load exercise. PvCO2 seemed to indicate a linear increase after a somewhat slow increase. CO2 store phase appearing in expiration of CO2 (stored CO2) was calculated from the data of O2 uptake (VO2), CO2 output. (VCO2) and work rate. The stored CO2 indicated a linear increase after a time delay. The stored CO2 also significantly related to PvCO2. When kinetics of PvCO2 at light exercise intensity was supposed from stored CO2, PvCO2 seemed to indicate a linear increase with a time delay. Excessive expired CO2 (excess CO2) was calculated from the data of VO2 and work rate. The excess CO2 significantly related to the increase of blood lactate. The blood lactate seemed to start to increase at around 1080 kpm/min. In spite of this change, a linear increase of PvCO2 was unchanged. This result was considered to be related to the excessive CO2 expiration corresponding to the increase of blood lactate. Thus, within the present results and assumptions, it seemed that PvCO2 indicated a linear increase with a time delay without the effect of lactate increase in incremental-load exercise.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"15-8"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.15","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Effect of physical exercise on renal response to head-out water immersion. 体育锻炼对头部水浸泡后肾脏反应的影响。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.35
H Rim, Y M Yun, K M Lee, J T Kwak, D W Ahn, J K Choi, K R Kim, Y D Joh, J Y Kim, Y S Park
{"title":"Effect of physical exercise on renal response to head-out water immersion.","authors":"H Rim,&nbsp;Y M Yun,&nbsp;K M Lee,&nbsp;J T Kwak,&nbsp;D W Ahn,&nbsp;J K Choi,&nbsp;K R Kim,&nbsp;Y D Joh,&nbsp;J Y Kim,&nbsp;Y S Park","doi":"10.2114/jpa.16.35","DOIUrl":"https://doi.org/10.2114/jpa.16.35","url":null,"abstract":"<p><p>Head-out water immersion (HOI) induces various renal functional changes, such as diuresis, natriuresis, and kaliuresis. The present study was undertaken 1) to characterize the renal response to HOI in Koreans who routinely ingest high salt diet and 2) to evaluate the impact of exercise on the renal response to HOI. Six healthy male subjects (average Na+ intake of 232 mEq.day-1) were immersed upto the neck in 34.5 degrees C water and rested in a seated position or exercised on a bicycle ergometer for 3 hours. In resting subjects, we observed a reversible increase in urine flow and a decrease in urine osmolality, with no changes in creatinine clearance. The peak urine flow observed during the second hour of immersion was 4-fold greater than the pre-immersion level. The excretion of total osmotic substances rose progressively during the 3-hour immersion, which was accompanied by a similar change in Na+ excretion. The K+ excretion was slightly elevated. The major component of the immersion diuresis was a water diuresis in the early phase and an osmotic diuresis in the late phase of immersion. In exercising subjects, the diuretic and natriuretic responses to HOI were attenuated and the kaliuretic response was potentiated. Blood hemoglobin concentration and plasma levels of renin, ADH, and aldosterone decreased during immersion-rest, but they remained unchanged or increased during immersion-exercise. These results suggest that 1) the cardiac mechanoreceptor-mediated renal responses to HOI are not changed by chronic high salt diet, and 2) excessive urinary sodium and water losses are prevented by exercise during immersion.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"35-43"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.35","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
The effects of preceded fatiguing on the relations between monopolar surface electromyogram and fatigue sensation. 前期疲劳对单极面肌电图与疲劳感关系的影响。
Applied human science : journal of physiological anthropology Pub Date : 1997-01-01 DOI: 10.2114/jpa.16.19
J Ohashi
{"title":"The effects of preceded fatiguing on the relations between monopolar surface electromyogram and fatigue sensation.","authors":"J Ohashi","doi":"10.2114/jpa.16.19","DOIUrl":"https://doi.org/10.2114/jpa.16.19","url":null,"abstract":"<p><p>Relations between surface electromyogram (EMG) and fatigue sensation was compared between the first fatiguing contraction and the following contractions with insufficient rests. Six male subjects performed static contractions of the elbow flexors at 8 and 13% MVC with the forearm semipronated and at 13% MVC with the forearm supinated. Contractions were repeated 6 (13% MVC) or (8% MVC) times (C1, C2, C3, C4, C5, C6) with rests of 5 min (13% MVC) or 10 min (8% MVC). During the contractions the subjects reported values of rated fatigue sensation (VRFS) whose scale was from 0.0 (no fatigue sensation) to 4.0 (apparent pain and moderate severity) at every 30 sec. C1 ended between 3.5 and 4.0 of VRFS or at 18 min (13% MVC) or 20 min (8% MVC) of contracting time. C2-C5 ended when fatigue sensation became that at the end of C1 or 5 min had passed. Bipolar and monopolar surface EMG was recorded from 6 synergists of elbow flexors. Mean amplitude (AEMG) and relative power below 22Hz (RPWL20) were calculated. Though AEMGs were positively correlated with VRFSs in C1, the correlations were often obscure in C2-C6. Most AEMGs at the same VRFS were larger in C2-C6 than in C1. AEMGs at the start of C2-C6 were sometimes larger than those at the end of C1. RPWL20s of monopolar EMG positively correlated with VRFSs. The RPWL20 correlations were often reserved in all contractions. The increases of AEMGs in C2-C6 at the same VRFS cannot be explained by the migration of the activities among synergists, since the increases in AEMGs were seen in most synergists simultaneously. The compensation of the failure of muscle contractibility were not the only cause of the increases in the AEMGs during fatiguing contractions. The compression of EMG spectrum towards lower frequencies was usable to estimate the change of fatigue sensation.</p>","PeriodicalId":79317,"journal":{"name":"Applied human science : journal of physiological anthropology","volume":"16 1","pages":"19-27"},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2114/jpa.16.19","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"20039699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
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