Effects Of Strength And Conditioning Training On Speed And Agility Of Tennis Beginners Aged 7-8

Abstract

METHODS:Twelve college-aged males and females completed maximal strength test (1-RM arm curl) and time to exhaustion static exercise test with the elbow at 90 degrees at moderateintensity (60%1RM) in both non-dominant and dominant arms before and after 4 weeks (3-4 times per week) of intervention. The dominant arm served as a control group without heating and cooling precondition. The intervention consists of the dominant upper arm muscle heating (40℃, 15 min) and cooling treatment (12℃, 15 min) followed by the isometric exercise training at 60%1-RM until exhaustion. Additionally, arm skinfold thickness and circumference were measured before and after the intervention to estimate the fat-free cross-section area (FFCSA). RESULTS: Biceps maximum strength (1-RM) is significantly improved in both the intervention group (pre: 17.0±5.4 vs post: 17.8±5.0 kg, p<0.05) and control group (pre: 17.2±5.3 vs post: 18.3±5.4 kg, p<0.05). However, time to exhaustion is only significant increased (pre: 45.7±21.5 vs post: 59.5±19.4 sec, p<0.05) in the control group but not the heating/cooling preconditioning group (pre: 53.1±21.8 vs post: 59.6±17.6 sec, p>0.05). There is no significant improvement in FFCSA in both groups. Nevertheless, 1-RM is highly correlated with FFCSA (r=0.91, p<0.05). CONCLUSION: Short-term isometric exercise training can improve skeletal muscle function in the absence of muscle hypotrophy and heating and cooling preconditioning does not provide additional benefit in enhancing human skeletal muscle performance.