HSS 1101 Chapter Notes - Chapter 4: One-Repetition Maximum, Strength Training, Lean Body Mass

• School: University of Ottawa
• Department: Health Sciences
• Course: HSS 1101
• Professor: Tien Nguyen

Document Summary

Exercises like sit-ups, push-ups, and pull-ups require eccentric and concentric contractions. Isometric contractions can also be done with body weight, for example in yoga such as the downward dog, and plank: fixed resistance: exercise that provide a constant resistance throughout a full range of movement. Barbells and dumbbells provide fixed resistance because their weight or the amount of resistance applied does not change as you exercise. However, due to the biometrics of human motion, the muscle forces that must be exerted to move the weight are lower at some joint angles and higher at others. Any given muscle generates the least amount of force at the beginning and ending positions of the exercise, and the most force of resistance when the joint is at a 90-degree angle. The machine controls the speed of the exercise and does not allow any faster motion, the exerciser performs at a maximal level of effort.