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Exercise and Muscle Performance

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...

Changes in the Appendicular Skeleton with Age

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...

Isotonic and Isometric Muscle Contractions

Isotonic and Isometric Muscle Contractions

Two primary types of muscle contractions are isotonic and isometric, each serving unique functions and involving distinct mechanisms. Both isotonic and isometric contractions are integral to the body's complex system of movement and stability. Isotonic exercises contribute significantly to functional strength and movement, while isometric contractions are crucial for maintaining posture and joint stability.
Isotonic contractions
Isotonic contractions occur when a muscle changes length while the...

Muscles of the Shoulder

Muscles of the Shoulder

The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...

The Functions of the Skeletal System

The Functions of the Skeletal System

The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...

Exercise and Cardiovascular Response

Exercise and Cardiovascular Response

Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...

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Related Experiment Video

Updated: Jul 6, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Strength training recommendations for the young athlete.

Jeffrey M Vaughn¹, Lyle Micheli

¹Division of Sports Medicine, Boston Children's Hospital, Boston, MA 02115, USA. jeffrey.vaughn@childrens.harvard.edu

Physical Medicine and Rehabilitation Clinics of North America

|April 9, 2008

Summary

Youth strength training is increasingly common. This guide offers the latest data for safe and effective programs, covering progression, sets, reps, and workout frequency to maintain gains.

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Last Updated: Jul 6, 2026

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Improving Strength, Power, Muscle Aerobic Capacity, and Glucose Tolerance through Short-term Progressive Strength Training Among Elderly People

Published on: July 5, 2017

Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations

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A Training Program Using an Agility Ladder for Community-Dwelling Older Adults

A Training Program Using an Agility Ladder for Community-Dwelling Older Adults

Published on: March 7, 2020

Area of Science:

Sports Medicine
Pediatric Exercise Science

Background:

Growing participation of youth in organized and competitive sports.
Emerging evidence supports strength training for preadolescent athletes' health and performance.

Purpose of the Study:

To present current data for developing safe and effective youth strength training programs.
To guide young athletes and coaches on optimal training parameters.

Main Methods:

Review of recent scientific literature on youth strength training.
Analysis of variables including rate of progression, sets, repetitions, and training frequency.

Main Results:

Provides specific recommendations on training volume (sets and repetitions).
Outlines appropriate progression rates for young athletes.
Addresses workout frequency to prevent strength detraining.

Conclusions:

Safe and effective strength training programs can be developed for preadolescent athletes.
Adherence to recommended guidelines ensures optimal health and sports performance benefits.