摘要:

Two elite junior ice hockey teams with players ranging in age between 16 and 20 years were measured on an extensive battery of laboratory tests at the beginning and end of a season in order to determine adaptive changes in the energy supply systems and associated functions. Pre- to post-season changes in maximal aerobic power showed a significant increase of 3% (p <.05) only when expressed in 1/min (4.30 vs 4.43). Additionally, when measurements were made on selected determinants of oxygen transport, no change was found in ventilation as reflected in VC (5.60 vs 5.52 /min), FEV1.0(4.37 vs 4.44 1/min), MBC (185.1 vs 186.4 1/min) and maximum exercise VE (128.0 vs 128.1 1/min, STPD) or in the cardiovascular system as reflected in hematocrit (45.3 vs 44.4%), hemoglobin (16.4 vs 16.2 g%) and maximum exercise HR (192 vs 191 beats/min). On the other hand, indications of change in the anaerobic energy supply systems were found. Maximal anaerobic capacity improved by 16.3% (p < 0.05) when measured in terms of run time (64.3 vs 74.8 sees) and maximal anaerobic power by 4.7% (p < 0.05) when expressed in m/sec (1.69 vs 1.77). Although comparable percentage increases were noted when peak lactate concentration and power (kgm/sec) were used as criterion measures for these tests respectively, statistical significance was not found. When the results were analyzed by position essentially the same changes were found.

ISSN:0025-7990    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

Anthropometric measurements and Heath-Carter somatotype ratings were made on 32 subjects upon entry into a U.S. Navy underwriter demolition team training program. Twenty subjects successfully completed the 4-month program and were remeasured. Comparisons were made between initial and final scores for those completing training, and between initial scores for trainees who successfully completed, the program and scores for those men who dropped from training, for the following variables: somatotype as a whole, three somatotype components, height, weight, height /weight.33, sum of skinfolds, arm and calf girths, and hone breadths. No differences were seen between successful and unsuccessful trainees, on any variable, when results from the pre-training measurements were compared. Successful trainees did not change in height or bone breadths, but showed decreased skinfolds and height/weight.33, along with increased weight and girths. Successful trainees' somatotypes changed, with a decrease in endomorphy and ectomorphy, and an increase in mesomorphy.

ISSN:0025-7990    

出版商:OVID    

年代:1975

数据来源: OVID

摘要:

The purpose of the present investigation was. to determine the effects of marihuana on physical performance as determined by six variables: heart rate, blood pressure, muscular strength, physical work capacity, forced vital capacity, flow rate of expiration. Twenty volunteer human marihuana smokers took part in three experimental testing sessions. Each subject reported to a laboratory on three different days. Day one was used as their control testing sessions. Day two and three were the placebo and marihuana sessions. On day three the subject smoked marihuana if he had placebo on day two, and vice versa. The test battery measures consisted of resting heart rate, resting systolic and diastolic blood pressure, grip strength, forced vital capacity and flow rate and a submaximal bicycle ergometer test. There were significant differences between the marihuana treatment group and the other treatment groups in heart rate, systolic and diastolic blood pressure and physical work capacity.

ISSN:0025-7990    

出版商:OVID    

年代:1975

数据来源: OVID

ISSN:0025-7990    

出版商:OVID    

年代:1975

数据来源: OVID