HMS, BM EQ-Bank 16 MC

Which sequence correctly describes the quadriceps muscle action and knee joint movement when performing a squat?

\begin{align*}
\begin{array}{l}
\rule{0pt}{2.5ex} \ \rule[-1ex]{0pt}{0pt}& \\
\rule{0pt}{2.5ex}\textbf{A.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{B.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{C.}\rule[-1ex]{0pt}{0pt}\\
\rule{0pt}{2.5ex}\textbf{D.}\rule[-1ex]{0pt}{0pt}\\
\end{array}
\begin{array}{|l|l|l|}
\hline
\rule{0pt}{2.5ex}\textbf{Descent Phase}\rule[-1ex]{0pt}{0pt}& \textbf{Bottom Position}& \textbf{Ascent Phase} \\
\hline
\rule{0pt}{2.5ex}\text{Eccentric}\rule[-1ex]{0pt}{0pt}&\text{Isometric }&\text{Concentric}\\
\hline
\rule{0pt}{2.5ex}\text{Concentric}\rule[-1ex]{0pt}{0pt}& \text{Isometric concentric}&\text{Eccentric}\\
\hline
\rule{0pt}{2.5ex}\text{Isometric}\rule[-1ex]{0pt}{0pt}& \text{Eccentric}&\text{Concentric} \\
\hline
\rule{0pt}{2.5ex}\text{Concentric}\rule[-1ex]{0pt}{0pt}& \text{Eccentric}&\text{Isometric} \\
\hline
\end{array}
\end{align*}

Show Answers Only

\(A\)

Show Worked Solution

During a squat, the quadriceps undergoes three distinct phases of contraction:

Descent phase:

Eccentric contraction – muscle lengthens under tension to control downward movement

Bottom position:

Isometric contraction – muscle length remains constant to maintain position

Ascent phase:

Concentric contraction – muscle shortens to produce force for upward movement against gravity

This sequence enables controlled movement throughout the entire squat pattern while managing forces at each phase.

\(\Rightarrow A\)