《9 age and sexrelated differences9章的年龄和性别差异课件》由会员分享，可在线阅读，更多相关《9 age and sexrelated differences9章的年龄和性别差异课件（34页珍藏版）》请在金锄头文库上搜索。
1、Age- and Sex-Related Differences,Chapter 9,Objectives,Evaluate safety when lifting with children Discuss sex-related differences in muscular function Describe the effects of aging on muscle Explain why adaptations vary,Sex vs. Gender,Sex = is biologically founded. A female has 2X chromosomes while a
2、 male has 1X and 1Y chromosome Gender = the behavioral, cultural, or psychological traits typically associated with one sex,Terminology,Chronological age- age in years and months (60 month diff) Biological age- stages of development measured by skeletal age, sex characteristics, physique Measured in
3、 Tanner stages,Youth Resistance Training,Children have not yet reached puberty Adolescents are post puberty Children increase strength with resistance training Most strength gains in preadolescents are neural,Youth Resistance Training,Adolescents may increase strength due to hypertrophy Female adole
4、scents have limited testosterone, but growth hormone and IGF cause muscle development (hypertrophy),WHY?,Benefits of Youth Resistance Training,Prevent injury Improve motor skills Improve sports performance Maximize bone density Improve strength and power,Potential Risks,Potential for injury to epiph
5、yseal plate, typically with heavy overhead lifts in an unsupervised setting Risk of repetitive use injuries Risk of catastrophic injury when basic safety guidelines are not followed,Program Design for Children,Address all fitness goals Children should be mature and have the desire to train Provide h
6、igh quality instruction,Program Design for Children,Progress gradually and safely Focus on form and technique Consider beginning new exercises with a stick instead of a bar,Guidelines for Youth Resistance Training,Teach the child the benefits of training Provide competent supervision Provide a safe
7、training environment,Guidelines for Youth Resistance Training,In general, perform 3 sets of 6-15 reps of single and multi-joint exercises For advanced multi-joint exercises, use appropriate form and loads,Guidelines for Youth Resistance Training,Use 2-3 nonconsecutive training days Use adult spotter
8、s when appropriate Vary the training program throughout the year Encourage children to drink water during exercise,Female Athletes,Body composition- generally more fat, less muscle and bone No difference prior to puberty After puberty, increased fat deposits Shorter time period for bone growth,Stren
9、gth and Power in Females,Absolute measures- men have more muscle mass, more strength Relative to body mass- lower body strength similar to males, upper body is less Relative to muscle cross-sectional area- very small differences exist between males and females The “quality” of muscle tissue in males
10、 and females is almost the same,Resistance Training in Females,Because the quality of muscle tissue is similar as in males, responses to RT are similar Absolute strength gains are less than in men Relative strength gains are equal or greater than in men Hypertrophy in females does occur and is simil
11、ar to males per unit of muscle cross sectional area,Program Design for Females,No appreciable differences than in males where the goals of training are the same Resistances will be lower Should pay particular attention to Upper body strength in sports requiring extensive use of the upper body Anatom
12、ical areas of high injury risk in females,Older Adults,Performance decreases with age Weightlifters- decrease 1-1.5% from age 30 through 70, more rapidly thereafter Trainability- older adults will improve with a training program at any age,Age-related Musculoskeletal Changes,Osteopenia- loss of bone
13、 mass Sarcopenia- loss of muscle mass mostly in type II fibers Decreased power output, likely due to the decrease in type II fibers and neural changes,WHY?,Resistance Training in Elderly,Increases are possible in all areas of development- strength, power, bone mass, muscle mass, functionality, endur
14、ance Low intensity training = modest improvement in fitness variables,Program Design in the Elderly,Resistance training of equal or more importance than aerobic training to delay age-related changes in the elderly Walking Stairclimbing Dressing Standing from chair/bed,Resistance Training Guidelines
15、for Elderly,Screen all participants for medical complications Warm-up prior to all activity Use appropriate resistance,Resistance Training Guidelines for Elderly,Avoid Valsalva maneuver Allow 48-72 hours for recovery Train in pain-free ROM Program supervised by trained instructors,Next Class,Chapter 22 Periodization Download Brown and Greenwood article and write a one page summary,
