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Volume 37 (2008)
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 37, Issue 1
Displaying 1-6 of 6 articles from this issue
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YASUYUKI YAMADA, MOTOKI MIZUNO, MIYUKI SUGIURA, SUMIO TANAKA, YUKI MIZ ...2008 Volume 37 Issue 1 Pages 1-11
Published: June 15, 2008
Released on J-STAGE: July 01, 2011
JOURNAL FREE ACCESSThe purpose of this study was to clarify the psychological factors of bus drivers' instability that were related to bus passengers' accidents according to the hypothesis model based on the stress concept of Lazarus and Folkman (1984). This research was carried out in 2006. Participants of the study were 39 Japanese male bus drivers. Their average age was 40.2 (SD: 11.1). The average duration of employment was 4.5 (SD:6.1) years. A questionnaire was used that was composed of items concerning the frequency of bus passengers' accidents, performance of safe driving, job stressors, stress reaction and recognition from others. Based on the results, a model assuming that stress reaction caused by job stressors disturbed the bus driver's safe driving and was associated with passengers' accidents in the bus was verified to some degree. Especially, melancholy and tired feeling toward passengers showed a strong relation to the passengers' accidents in the bus. This suggested much room for intervention. Moreover, the recognition from others of their job was confirmed to act as a control factor of the stress reaction.View full abstractDownload PDF (1512K) -
JUN-YA OHASHI, ANNE KATRINE BLANGSTED, PERNILLE KOFOED NIELSEN, KURT J ...2008 Volume 37 Issue 1 Pages 13-22
Published: June 15, 2008
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSMuscle strain was assessed with surface EMG during simulated mushroom picking. Nine female subjects performed five periods of work (W1-W5). The duration of each period was about 20 min. W1, W2 and W3 were separated by a short break of several minutes. W3, W4 and W5 were separated by a rest period of about 43 min. EMGs were recorded from the muscles of trapezius, infraspinatus, deltoid and erector spinae muscles. Amplitude of EMG (AEMG) and mean power frequency (MPF) of EMG were calculated every minute. Ratings of perceived exertion (RPE) were recorded for every 5 min. RPE increased during each work period and with the advance of W1-3. AEMG increased during some of the work periods in the trapezius and infraspinatus. AEMG decreased in a few of the work periods in the other muscles. MPF decreased during some of the work periods in the infraspinatus, deltoid and erector spinae. The increase of AEMG in the trapezius was interpreted as spare capacity for the work. The infraspinatus and deltoid were assessed to be more fatigued than the trapezius. The fatigue level of the erector spinae was low.View full abstractDownload PDF (3147K) -
NUCHRAWEE JAMJUMRUS, SUEBSAK NANTHAVANIJ2008 Volume 37 Issue 1 Pages 23-33
Published: June 15, 2008
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis paper discusses the application of analytical algorithms to determine necessary adjustments for operating notebook computers (NBCs) and workstations so that NBC users can assume correct work postures during NBC operation. Twenty-two NBC users (eleven males and eleven females) were asked to operate their NBCs according to their normal work practice. Photographs of their work postures were taken and analyzed using the Rapid Upper Limb Assessment (RULA) technique. The algorithms were then employed to determine recommended adjustments for their NBCs and workstations. After implementing the necessary adjustments, the NBC users were then re-seated at their workstations, and photographs of their work postures were re-taken, to perform the posture analysis. The results show that the NBC users' work postures are improved when their NBCs and workstations are adjusted according to the recommendations. The effectiveness of ergonomic intervention is verified both visually and objectively.View full abstractDownload PDF (5420K) -
SINICHI DEMURA, SHUNSUKE YAMAJI, HIROKI AOKI, KENGO MOTOSUKE2008 Volume 37 Issue 1 Pages 35-43
Published: June 15, 2008
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSLinear polarized near-infrared light (PL) irradiation is considered one of the useful methods for muscle fatigue recovery, because it increases the blood flow and skin temperature of the irradiated part. The purpose of this study was to examine the effect of PL-irradiation on muscle fatigue recovery and physiological response in the upper limbs after maximal repeated rhythmic hand gripping (RRH). Ten males and ten females participated in this study. Subjects performed RRH for 9 min, and then rested for 20 min with PL- or placeboirradiations. After rest, they again performed RRH for 3 min. As evaluation parameters, we selected the sustained force curve during RRH, subjective muscle-fatigue sensation (Fs), blood lactate concentration (La), muscle oxygenation (Total Hb, Oxy-Hb, and Deoxy-Hb), and skin temperature. The decreasing rate of the integrated area for 30 sec during RRH was significantly smaller in the PL-irradiation than with the placebo. There were no significant differences between irradiation conditions for fatigue sensation and lactate concentration Skin temperature during rest was kept high by PL-irradiation. Muscle oxygenation tended to remain slightly high during the initial phase (1-8 min after the exercise). It is inferred that PL-irradiation maintains a high skin temperature and blood flow, but it may not con-tribute to recover muscle contraction performance in muscle fatigue.View full abstractDownload PDF (1564K) -
I DEWA PUTU SUTJANA, M. SUTAJAYA, SUSY PURNAWATI, P. ADIATMIKA, K. TUN ...2008 Volume 37 Issue 1 Pages 45-48
Published: June 15, 2008
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSForty-six measurements were measured on 127 medical students (60 males and 67 females) in Indonesia by using the traditional anthropometric methods. The means, standard deviations and, 5th, 50th, and 95th percentile values were calculated and presented.View full abstractDownload PDF (405K) -
TOMOMICHI KOBAYASHI2008 Volume 37 Issue 1 Pages 49-55
Published: June 15, 2008
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSPrevious studies carried out in Western countries on mother-infant and father-infant interactions in play activities revealed the following tendencies. (1) Play activities between fathers and their children are physical and unusual, whereas, play between mothers and their chil-dren are conventional and moderate. (2) Boys prefer to play with their fathers, whereas, girls prefer to play with their mothers. The previous studies by the author on outdoor play interactions in Japanese families suggest that these tendencies may be an adaptation to hunter-gatherer lives. In the present study, this suggestion was investigated by examining whether (1) fathers tend to teach their sons how to fish more frequently than they teach their daughters, and (2) boys taught fishing skills by their fathers tend to have better fishing skills than other same-aged boys taught fishing skills by persons other than their fathers. The experiment was performed by obtaining information through a questionnaire from third and fifth grade students in four elementary schools. The results indicate the followings. (1) Fathers tend to teach their sons fishing more often than they tend to teach their daughters. (2) Male students mostly taught fishing by their fathers tend to gain better skills in fishing than those mostly taught fishing by persons other than their fathers.View full abstractDownload PDF (2818K)
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