Muscle Mechanics & Rate of Force Development - Flashcards

Flashcards covering RFD, neural mechanisms, muscle architecture, fiber types, gearing, length-tension, and training implications.

RFD is defined as __.

change in force / change in time

Rate of Force Development is explosive strength that relates to and influences __.

velocity or power

In sport, there is a critical time period in which __ is essential.

RFD

The neural mechanism: the magnitude of FP correlation to muscle activation and __ rate.

discharge

Recruitment order is consistent with the __ principle.

size

In fast/ballistic movements, the rate coding threshold is __, so fast and slow twitch fibers become active sooner.

lower

Faster muscle activation directly correlates to greater ability to achieve __.

RFD

Limiting factor: insufficient activation from the __ cortex.

motor

Total cross sectional area has __ correlations with force and RFD.

small

Tissue stiffness shows __ correlations with force and RFD.

good

Type 2 fibers have a faster cross-bridge cycling rate and Ca2+ release than Type 1, contributing to __.

increased RFD

Increasing Type 2 fiber CSA (e.g., a 2:1 ratio) is associated with increased __.

RFD

High gear in gearing leads to high velocity contractions and an increased __ angle.

pennation

Low gear is about a 1:1 ratio, producing high force contractions and __ velocity contractions.

low

Shorter muscle fibers are associated with increased __.

RFD

Sprint training improved the sarcoplasmic reticulum's ability to release Ca2+ at a faster rate, thereby influencing __.

RFD

Myosin __ control the myosin heavy chains.

light chains

Tissue stiffness is a measure of resistance to deformation and influences __.

force transmission

RFD is more __ to performance than maximal strength.

related

A training approach that combines heavy and light days in the same session can enhance __, RFD, and power output.

explosiveness

Length-tension relationship describes how muscle force changes with length: initially increasing with length, reaching a __, then decreasing.

maximum

Ca2+ must bind to the __ to permit cross-bridge cycling.

troponin

When actin and myosin overlap is too little, no force is produced; as overlap increases, force increases; once actin overlaps itself, force begins to __.

decrease