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Muscular Strength and Endurance CHAPTER 4 Muscle Fibers Hypertrophy Increase in size of muscle fibers Hyperplasia Increase in the number of muscle fibers Atrophy Decrease in size muscle fibers Muscle Fibers Slow-twitch Red muscle fibers Fatigue resistant Slow contraction action Aerobic fuels Muscle Fibers Fast-twitch White muscle fibers Fatigues Fast contraction action Anaerobic fuels Benefits of Muscular Strength and Endurance (table 4.1) Performance Injury prevention Improved body composition Improved self image Improved quality of life Decrease risk of osteoporosis Prevention of chronic disease Increased metabolic rate Static Exercise vs. Dynamic Exercise Static Isometric Contraction occurs Length of muscle remains the same Force of muscle is less than or equal to the resistance Used to overcome weak points to ROM Do not gain max strength at full ROM Static Exercise vs. Dynamic Exercise Dynamic Isotonic Contraction occurs Muscle length changes Concentric - shorten Eccentric - lengthen Force of muscle is greater than resistance Static Exercise vs. Dynamic Exercise Dynamic Isotonic Constant resistance Will not gain max strength at full ROM Variable resistance Can gain max strength at full ROM Static Exercise vs. Dynamic Exercise Dynamic Plyometrics Muscle exerts force while it lengthens Muscle then has a rapid concentric contraction Explosive movement Speed loading Moving a load as rapidly as possible FITT Principle Frequency Major muscle groups 2 times/week Split routine 24 hour rest at least FITT Principle Intensity Strength Heavy resistance/low reps 80% of 1RM 1-5 reps (some suggest 6-8 reps) 1-3 sets FITT Principle Intensity Endurance Light resistance/high reps 40 to 60% of 1RM 15-20 reps 1-3 sets FITT Principle Intensity Combination of Strength and Endurance Medium resistance/medium reps 60 to 70% of 1RM 8-12 reps 1-3 sets FITT Principle Duration (Time) Work to fatigue muscles When using body weight as resistance this is especially true FITT Principle Mode (Type) Resistance train all major muscle groups At least 8 to 10 exercises all together Free weights Machines Body weight Stability Balls Pilates FITT Principle Resistance Bands Create resistance Work opposing muscles groups (Symmetry) Agonist Contracting muscle Antagonist Relaxed muscle Warm-up and Cool-down Use a rhythmical warm up Light weight of the exercise Stretch and rest for your cool-down Resistance Training Safety Technique No bouncing and jerking Keep weights close to body Don’t hold breath Slow Double the eccentric if you have trouble going too fast or “cheating on the eccentric) Spotters Practice Lift the weight you can lift Knowledgeable Pays attention Communicate Resistance Training Safety Collars Injury prevention Report obvious muscle or joint injury Report unusual symptoms Stop exercising RICE Don’t chew gum while exercising Weight Training Exercises Page 124 Common questions Page 111-123 Weight training exercises