ABSTRACT
Objective@#To explore the suitable load of endurance training for primary school students with different BMI levels living in 3 200 m plateau, and to provide guidance for exercise and weight control for children residing in high altitudes.@*Methods@#The heart rate deflection point (HRDP) and HRDPspeed of 7-12 year-old students residing at high altitude were evaluated by using the site Conconi test. The serum lipid metabolism level was detected by ELISA. The correlation between HRDP and lipid metabolism was analyzed by Pearson correlation analysis.@*Results@#The level of leptin, adiponectin, total cholesterol(TC) and triglycerides(TG) in obesity group was highest, follow by the overweight group, normal weight and under-weight group(F=3.75-24.12, P<0.05). In the same age group, hrdpspeed decreased with the increase of BMI. For children with the same BMI classification, HRDPspeed decreased with age. HRDPspeed showed an increasing trend by age and BMI. In obese, normal and emaciated students, there was a significant negative correlation between lipid metabolism and HRDP, but there was no significant correlation between lipid metabolism and HRDP in overweight students of different ages (P>0.05).@*Conclusion@#It is suggested that HRDP and lipid metabolism may be signcficantly correlated with BMI in students aged 7-12 years at different BMI levels in plateav and the above indicators can be used as an effective means to evaluate aerobic exercise endurance capacity of healthy adults at plateau.
ABSTRACT
In this article in order to build up an efficient regeneration system for cotyledons or hypocotyls of tomato MicroTom, two kinds of seed disinfectant (3% NaClO and 0.1% HgCl2 used for 5, 10, 15, 20 min), two types of basal medium (MS: Murashige and Skoog，1964, and B5: Gamborg et al.,1968), different ratio of Indole Butyric Acid (IBA: 0.05, 0.1, 0.2 mgL- 1) and 6-benzylaminopurine (6-BA: 1.0, 1.5, 2.0, 3.0 mgL-1) were tested. As for gene transform system, kanamycin (Kan: 0, 25, 50, 75, 100, 150mgL-1), carbenicillin, cephalosporin, cefoperazone sodium and sulbactam sodium for injection (Carb, CS, CSSS respectively) at the rate 100, 200, 300, or 500 mgL-1, respectively were added in medium B5 in order to find the suitable concentration for bacteriostasis and shoot regeneration. Moreover, cell concentration of Agrobacterium EHA105 (OD600: 0.3, 0.5, or 0.8）and infection time (5, 10, 15 min) were screened and optimized in this article. The results showed that 3% NaClO for 20 min is optimal as for the disinfect efficiency on the seed surface. The most suitable medium to induce adventitious bud is basal medium B5+0.05 mgL-1 IBA＋1.5 mgL-1 6-BA. The cotyledons and hypocotyls were cultivated in culture medium B5+IBA @ 0.05 mgL-1 for 2 d, then infected by Agrobacterium EHA105 (OD600=0.5) for 10 min, then plantlets were transferred to a fresh regeneration medium which contained 50 mgL-1 Kan and 300 mgL-1 CSSS, which was proved to be the most suitable transformation system for MicroTom.