The aims of the present study, were a) to investigate physiological responses in man who ingested branched-chain amino acid (BCAA) drink for 8 consecutive days during and after incremental exercise and b) to examine the effects of BCAA drink intake on aerobic performance during the exercise. Five healthy males ingested 2000mg・day^<-1> of BCAA drink for 7 consecutive days and 10000-mg BCAA before the experiment and performed incremental cycle ergometer exercise until exhaustion. Exercise duration until exhaustion significantly extended and blood lactate concentration at a 100-W load significantly decreased compared to before ingesting BCAA (p<0.05, respectively). These results suggest that BCAA drink intake could result in improving aerobic performance.
To evaluate the influence on sleep by mobility and comfort on a mattress, we estimated subjective sleep feelings and measured sleep quality by polysomnography. Ten healthy subjects (4 males, 6 females), aged 62-67, were recorded, sleeping in a laboratory for two nights at a week interval under two crossover designed conditions (EMC: a mattress easy to move and comfortable by first impressions, DMU: a mattress difficult to move and uncomfortable by first impressions). The percentage of wakefulness in the first half of sleep time was significantly increased at DMU. Subjective sleep feelings were better at EMC and subjective evaluations at the time of arising showed EMC was easier to move and more comfortable. These results suggest that mobility and comfort on a mattress is important for better sleep.
The aim of this study was to examine a potential of three-dimensional human body model (3DHBM) produced from two-dimensional photography to estimate percentage body fat (%BF). Photographs from front and side views were taken from 14 Japanese female college students (aged between 18-22 years old). Pictures taken from the front view was converted to a polygon mesh human body model (PMHBM) and adjusted with measured anthropometric parameters in order to produce 3DHBM. Determined 3DHBM was then utilized to calculate body volume (BV_<3D>) and body density (BD_<3D>) as well as %BF using Siri and Brozek prediction equations. The estimated body composition variables from 3DHBM were compared with a multi-frequency bioelectrical impedance analysis (MFBIA). While BV_<3D> was highly correlated with BV_<MFBIA> (r=0.993, p<0.001), no significant correlation was observed between BD_<3D> and BD_<MFBIA>. Average %BF estimated from 3DHBM was six percent lower than the value obtained from MFBIA. The current study recommends further investigation to minimize differences in body composition predictions from photographs.