武术运动员训练中糖营养素的补充

根据运动生理学有关运动中人体能量代谢的相关理论，对武术运动训练中补充糖类营养的重要性作了相关探讨。在分析武术训练特点的基础上，指出武术训练中供能系统主要为ATP-CP系统和糖酵解系统，并就糖补充的时机、种类和量等作了详细阐述，以求为竞技武术运动训练中糖营养补充提供有益的参考。     

茶多酚对裸鼠喉鳞癌的抑制作用及机制研究

目的观察萘多酚对裸鼠喉鳞癌的抑制作用，并初步探讨其机制。方法将接种Hep22细胞后的裸鼠随机分为4组，其中对照组8只，每天给予生理盐水1ml灌胃；茶多酚高、中、低剂量组各8只，每天分莉给予茶多酚80、160、320mg／kg。20d后处死。分离肿瘤测量其体积，real—time RT—PCR法检测肿癌组织中Src、HK Ⅱ mRNA的表这。己糖激酶活性测定试剂盒测定肿瘤组织中己糖激酶活性。结果茶多酚能硬显降低肿瘤体积，降低肿瘤组织中Src、HK Ⅱ mRNA的表达和己糖激酶活性。结论茶多酚能抑制裸鼠喉鳞癌的生长，其机制可能与抑制肿瘤糖酵解有关。     

Experimental data on the energetic flux during glycolytic oscillations in yeast extracts

Calorimetric experiments were performed on yeast extracts in which glycolytic oscillations were occurring. High metabolic fluxes coincided with low amplitudes and with high frequencies in a temperature range from 283 to 303 K, yielding an activation energy ofE _a=76.8 kJ mol^–1 and a mean Q₁₀ value of 2.5±0.4. The calorimetrically determined reaction enthalpy _fH^0, of the glycolytic catabolism of glucose revealed two distinct groups of extract preparations, with no intermediate values. The values were –107.5±28.7 kJ mol^–1 and –30.8±5.7 kJmol^–1, respectively, while –100.0 kJ mol^–1 was predicted from theoretical calculations. Kreuzberg and Betz⁶ predicted rate limiting effects of GAPDH in oscillating extracts. However, when possible effects of GAPDH on frequency, number of oscillations or total heat production were examined, no influence of increasing or reducing the initial GAPDH concentration could be found. The results are discussed with reference to existing models of glycolytic oscillations.     

体育项目中运动员多次大强度短距离跑的生理学认识

许多体育运动项目中,包含着多次大强度短距离跑(≤6s),同时伴随着一段较长时间(≤60s)中等或低强度运动。尽管对这一复杂的运动方式进行过一些研究,但近来的一些研究能够较好认识和评定多次短暂的短距离跑跑生理反应。一次短暂(5-6s)的大强度运动,ATP能量的来源主要靠无氧代谢提供(磷酸肌酸分解和糖原酵解),而有氧代谢提供的能量相对较下(<10%)。在恢复过程,摄氧量仍持续增加,以恢复体内的代谢平衡。