Sports-Specific Conditioning — MCQs
The rhythm for inspiration starts in:
Anterior gliding of the tibia on the femur is prevented by
During exercise increase in O2 delivery to muscles is because of all except:
A pole vaulter had a fall during pole vaulting and had paralysis of the arm . Which of the following investigations gives the best recovery prognosis -
Aerobic capacity is increased by:
Physiological unlocking is caused by -
Latent period of muscle twitch is 10 milliseconds, contraction period is 40 milliseconds, and the relaxation time is 50 milliseconds. What would be the tetanizing frequency?
An 18-year-old athlete presents with acute knee pain and hemarthrosis after pivoting. The Lachman test is positive. Which ligament is most likely injured?
Train of four fade is a characteristic feature of:
Patient had an injury to thumb causing thumb abduction. Which of the following can happen?
Sports-Specific Conditioning Indian Medical PG Practice Questions and MCQs
Question 1: The rhythm for inspiration starts in:
- A. Pneumotaxic centre
- B. Apneustic centre
- C. DRG
- D. Pre-Botzinger complex (Correct Answer)
Explanation: ***Pre-Botzinger complex*** - The **Pre-Botzinger complex** is a cluster of neurons in the medulla oblongata recognized as the primary site for generating the **respiratory rhythm**. - It establishes the basic pattern for **inspiratory efforts**, acting as the central pattern generator for breathing. *Pneumotaxic centre* - The **pneumotaxic center** (located in the pons) fine-tunes the respiratory rhythm by **inhibiting inspiration**, thus regulating the rate and depth of breathing. - While it modulates respiration, it does not originate the basic inspiratory rhythm. *Apneustic centre* - The **apneustic center** (located in the pons) prolongs inspiration by stimulating the inspiratory neurons in the medulla. - Its main role is to promote deep, prolonged inspiratory gasps, but not to initiate the rhythm. *DRG* - The **Dorsal Respiratory Group (DRG)** in the medulla contains inspiratory neurons that primarily control the **diaphragm** and **external intercostals**. - While essential for inspiration, the DRG receives its rhythmicity from the Pre-Botzinger complex and acts as an integration center for various inputs.
Question 2: Anterior gliding of the tibia on the femur is prevented by
- A. Anterior cruciate ligament (Correct Answer)
- B. Ligament of Humphrey
- C. Ligament of Wrisberg
- D. Posterior cruciate ligament
Explanation: ***Anterior cruciate ligament*** - The **anterior cruciate ligament (ACL)** is a crucial stabilizer of the knee joint, preventing the **anterior translation of the tibia** relative to the femur. - It also limits **hyperextension** and internal rotation of the tibia. *Posterior cruciate ligament (PCL)* - The **PCL** primarily prevents posterior displacement or **gliding of the tibia** on the femur. - It is often injured by direct trauma to the anterior tibia or through vehicular accidents. *Ligament of Humphrey* - The **ligament of Humphrey** is an accessory ligament of the knee that runs anterior to the **posterior cruciate ligament (PCL)**. - It arises from the posterior horn of the lateral meniscus and inserts into the medial femoral condyle, potentially augmenting PCL function. *Ligament of Wrisberg* - The **ligament of Wrisberg** is another accessory ligament that runs posterior to the **posterior cruciate ligament (PCL)**. - It also originates from the posterior horn of the lateral meniscus and inserts into the medial femoral condyle, serving a similar function to the ligament of Humphrey in stabilizing the knee.
Question 3: During exercise increase in O2 delivery to muscles is because of all except:
- A. Increased blood flow to muscles
- B. Oxygen dissociation curve shifts to left (Correct Answer)
- C. Increased extraction of oxygen from the blood
- D. Increased stroke volume
Explanation: ***Oxygen dissociation curve shifts to left*** - During exercise, the **oxygen dissociation curve actually shifts to the right** (Bohr effect), facilitating the release of oxygen to deprived tissues. - A left shift would mean **hemoglobin binds more tightly to oxygen**, making it harder for oxygen to be delivered to exercising muscles. *Increased blood flow to muscles* - **Vasodilation** in the active muscles directs a larger proportion of the cardiac output to meet their metabolic demands. - This significantly increases the amount of **oxygenated blood** reaching the muscle tissue. *Increased extraction of oxygen from the blood* - Exercising muscles have a **higher metabolic rate** and thus a greater demand for oxygen. - This leads to a larger **arteriovenous oxygen difference**, meaning more oxygen is removed from the blood as it passes through the capillaries. *Increased stroke volume* - The heart pumps a **greater volume of blood per beat**, increasing cardiac output. - This contributes to the overall increase in **blood flow to the systemic circulation**, including the muscles.
Question 4: A pole vaulter had a fall during pole vaulting and had paralysis of the arm . Which of the following investigations gives the best recovery prognosis -
- A. Electromyography (Correct Answer)
- B. Strength Duration Curve
- C. Creatine phosphokinase levels
- D. Muscle biopsy
Explanation: Electromyography - **Electromyography (EMG)** can help assess the extent of nerve damage and reinnervation, providing insights into the potential for recovery [1]. - The presence of **spontaneous activity** (fibrillations, positive sharp waves) indicates denervation, while the appearance of **motor unit action potentials (MUAPs)** suggests reinnervation [1]. *Creatine phosphokinase levels* - **Creatine phosphokinase (CPK)** levels primarily indicate **muscle damage**, not the extent of nerve injury or recovery potential. - While muscle damage can occur with nerve injury, CPK does not provide specific prognostic information for nerve regeneration. *Strength Duration Curve* - The **strength duration curve** assesses the excitability of a nerve or muscle to electrical stimulation. - While it can differentiate between **nerve and muscle damage**, it provides less comprehensive prognostic information compared to EMG regarding the status of nerve regeneration. *Muscle biopsy* - A **muscle biopsy** would directly evaluate muscle pathology, such as atrophy or regeneration. - However, it is an **invasive procedure** and provides less direct information about nerve recovery compared to EMG, which directly assesses nerve and muscle electrical activity.
Question 5: Aerobic capacity is increased by:
- A. Strenuous exercise
- B. Regular moderate-intensity exercise
- C. High-intensity interval training (Correct Answer)
- D. Prolonged exercise routine
Explanation: ***High-intensity interval training*** - **High-intensity interval training (HIIT)** is the **most efficient method** for improving **aerobic capacity (VO2max)** in the shortest time frame. - The alternating periods of maximal effort and short recovery lead to **greater increases in maximum oxygen uptake (VO2max)** compared to continuous moderate-intensity training. - HIIT elicits strong physiological adaptations in both **cardiovascular and muscular systems**, including increased mitochondrial density and enhanced oxygen delivery. *Strenuous exercise* - While strenuous exercise can contribute to improved fitness, it is a **broad, non-specific term** that does not refer to a structured training method optimized for aerobic capacity. - The effectiveness depends entirely on the **duration, frequency, intensity**, and specific structure of the exercise. *Regular moderate-intensity exercise* - **Regular moderate-intensity exercise** (continuous aerobic training) effectively improves aerobic capacity and is excellent for building an **endurance base**. - However, research shows that HIIT produces **faster and greater improvements in VO2max** per unit of training time compared to traditional moderate-intensity continuous training. - Both methods improve aerobic capacity, but HIIT is more **time-efficient** and produces superior VO2max adaptations. *Prolonged exercise routine* - A **prolonged exercise routine** is too vague and could refer to any long-duration training program. - While prolonged endurance training improves aerobic fitness, it is **less efficient** than HIIT for maximizing VO2max gains, though it excels at improving **fat oxidation** and **endurance performance**.
Question 6: Physiological unlocking is caused by -
- A. Sartorius
- B. Rectus femoris
- C. Semimembranosus
- D. Popliteus (Correct Answer)
Explanation: ***Popliteus*** - The **popliteus muscle** is responsible for the **physiological unlocking** mechanism of the knee joint at the beginning of flexion from a fully extended position. - It **internally rotates the tibia** on the femur (or externally rotates the femur on the tibia) to disengage the femoral condyles from their locked position, allowing flexion to initiate. *Sartorius* - The **sartorius muscle** is a strong flexor, abductor, and external rotator of the hip, and a flexor and internal rotator of the knee joint. - It does not primarily contribute to the unlocking mechanism of the knee. *Rectus femoris* - The **rectus femoris** is one of the quadriceps muscles and is a powerful extensor of the knee. - It plays no role in initiating knee flexion by unlocking the joint. *Semimembranosus* - The **semimembranosus** is part of the hamstring group, primarily involved in knee flexion and hip extension. - While it contributes to knee flexion, it does not perform the specific rotational movement required for unlocking the knee.
Question 7: Latent period of muscle twitch is 10 milliseconds, contraction period is 40 milliseconds, and the relaxation time is 50 milliseconds. What would be the tetanizing frequency?
- A. 50 Hz
- B. 75 Hz
- C. 25 Hz (Correct Answer)
- D. 100 Hz
Explanation: ***25 Hz*** - **Tetanizing frequency** is the minimum stimulation frequency required to produce tetanus (sustained muscle contraction without complete relaxation between stimuli). - For **incomplete tetanus** to occur, the next stimulus must arrive during the relaxation phase, before the muscle fully relaxes. - The critical time window is the **latent period + contraction period** = 10 ms + 40 ms = 50 ms. However, to ensure summation occurs reliably during relaxation, stimuli typically arrive at a slightly higher frequency. - **Practical tetanizing frequency** = approximately 1/(40 ms) = **25 Hz**, which ensures stimuli arrive during the latter part of contraction or early relaxation phase, producing sustained tension. - This frequency allows sufficient overlap for tetanic fusion while accounting for the physiological requirements of the muscle twitch cycle. *50 Hz* - This frequency (one stimulus every 20 ms) would produce a **complete tetanus** with no visible relaxation between stimuli. - This is higher than the minimum tetanizing frequency required for this muscle with its 100 ms total twitch duration. - While this would produce tetanus, it exceeds the minimum frequency needed. *75 Hz* - This very high frequency (one stimulus every 13.3 ms) would produce a **smooth, complete tetanus**. - This is approximately 3 times the minimum tetanizing frequency and represents excessive stimulation. - Such high frequencies are well beyond what is needed to prevent relaxation in this muscle. *100 Hz* - This extremely high frequency (one stimulus every 10 ms, equivalent to the latent period alone) would produce **maximal tetanic fusion**. - This is 4 times the minimum tetanizing frequency needed for this muscle. - While physiologically possible, this represents supramaximal stimulation frequency for tetanus production in this scenario.
Question 8: An 18-year-old athlete presents with acute knee pain and hemarthrosis after pivoting. The Lachman test is positive. Which ligament is most likely injured?
- A. Posterior Cruciate Ligament
- B. Anterior Cruciate Ligament (Correct Answer)
- C. Lateral Collateral Ligament
- D. Medial Collateral Ligament
Explanation: ***Anterior Cruciate Ligament*** - The **Lachman test** is the most sensitive clinical test for diagnosing an **ACL tear**, indicating anterior tibial translation. - **Pivoting injuries** and **hemarthrosis** (blood in the joint) are classic signs of a severe ACL injury, often involving bone bruising. *Posterior Cruciate Ligament* - PCL injuries are less common and typically result from a direct blow to the **anterior tibia** while the knee is flexed or a hyperextension injury. - The primary test for PCL integrity is the **posterior drawer test**, which assesses posterior tibial translation. *Lateral Collateral Ligament* - LCL injuries usually result from a **varus stress** to the knee, often in contact sports, and can cause pain on the lateral aspect of the knee. - The **varus stress test** is used to assess LCL integrity, but it does not cause hemarthrosis as frequently as an ACL tear. *Medial Collateral Ligament* - MCL injuries are common and result from a **valgus stress** to the knee (a blow to the outside of the knee). - The **valgus stress test** assesses MCL integrity, causing pain on the medial aspect of the knee and typically not resulting in acute hemarthrosis unless other structures are also injured.
Question 9: Train of four fade is a characteristic feature of:
- A. Non depolarizing block (Correct Answer)
- B. Depolarizing block
- C. Both depolarizing and non-depolarizing block
- D. Malignant hyperthermia
Explanation: ***Non depolarizing block*** - A **train-of-four (TOF) fade** is a hallmark of **non-depolarizing neuromuscular block**, due to the competitive antagonism of acetylcholine at the postsynaptic receptor. - The first twitch depletes a portion of readily releasable acetylcholine, and the subsequent twitches show progressive fade because less acetylcholine is released with each successive stimulus. *Depolarizing block* - In a **Phase I depolarizing block**, there is **no fade** with TOF stimulation because the acetylcholine receptor is continuously activated, leading to sustained depolarization. - During prolonged exposure to a depolarizing agent, a Phase II block may develop which *can* exhibit fade, but this is a secondary phenomenon, and the primary characteristic of a depolarizing block is lack of fade. *Both depolarizing and non-depolarizing block* - While a **Phase II depolarizing block** can show fade, it is not a *characteristic* feature of all depolarizing blocks, distinguishing it from the consistent fade seen in non-depolarizing blocks. - The primary action of depolarizing agents (Phase I block) does not involve fade, making this option incorrect as a universal characteristic. *Malignant hyperthermia* - **Malignant hyperthermia** is a hypermetabolic crisis triggered by certain anesthetic agents, primarily involving uncontrolled calcium release from the sarcoplasmic reticulum, not directly related to neuromuscular blockade monitoring patterns. - While muscle rigidity can be a symptom, it does not manifest as a **train-of-four fade**, which is specific to postsynaptic acetylcholine receptor interactions.
Question 10: Patient had an injury to thumb causing thumb abduction. Which of the following can happen?
- A. Kaplan lesion
- B. Game keepers thumb (Correct Answer)
- C. Mallet finger
- D. Bennett fracture
Explanation: ***Gamekeeper's thumb*** - A **Gamekeeper's thumb**, or **skier's thumb**, is an injury to the **ulnar collateral ligament (UCL)** of the thumb's metacarpophalangeal (MCP) joint. - This injury commonly occurs due to a **forceful abduction** and hyperextension of the thumb. *Kaplan lesion* - A **Kaplan lesion** refers to an avulsion fracture of the radial styloid process, usually associated with scaphoid fractures. - This lesion is typically related to wrist injuries, not primarily thumb abduction. *Bennett fracture* - A **Bennett fracture** is an intra-articular fracture at the base of the first metacarpal bone. - It usually results from an axial load applied to a partially flexed thumb, rather than pure abduction. *Mallet finger* - A **mallet finger** is an injury to the **extensor tendon** of the finger, causing the fingertip to remain in a flexed position. - This injury typically affects the distal interphalangeal (DIP) joint of any finger and is not directly related to thumb abduction.
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