2.1. Competition History and Methodological Approach

This case study reports the SM and strength of a 30 year old drug-free raw (i.e. without the use of powerlifting supportive equipment) powerlifter who competes in the super heavyweight division and holds world records in the squat (477.5 kg), deadlift (392.5 kg), and total (1105 kg).

This individual has won 3 National Championships as well as 4 World Championships with his most recent victory at the IPF World Classic Championships in Belarus. There he totaled 1090 kg across all three lifts at a body mass of 181.2 kg (Wilks of 585.98). His best squat, bench press, and deadlift that day were 470 kg, 242.5 kg, and 377.5 kg, respectively. This study was approved by the University’s institutional review board.

Muscle thickness was measured by B-mode ultrasound (Logiq e, L4-12t probe, GE, Fairfield, CT, USA) at nine sites (abdomen, anterior forearm, anterior and posterior upper arm, anterior and posterior upper-leg, anterior and posterior lower leg, and subscapula) on the right side of the body (Table 1) as described previously (10). This testing was carried out at least 24 hours after the last training session. From these measurements, total SM was estimated using the prediction equation by Sanada et al. (7). SM index was calculated as SM (kg) divided by height squared (m2). Test-retest reliability of muscle thickness measurements (ICC, SEM and minimal difference) was determined as described previously (11).

Table 1. Subcutaneous Fat Thickness and Skeletal Muscle Thickness at Nine Sites Thickness, cm Subcutaneous Fat Skeletal Muscle Forearm anterior 0.67 4.80 Upper-arm anterior 0.85 6.29 Upper-arm posterior 0.58 7.13 Abdomen 3.56 2.87 Subscapula 1.41 5.82 Upper-leg anterior 0.71 9.79 Upper-leg posterior 0.70 10.82 Lower-leg anterior 0.49 3.34 Lower-leg posterior 0.62 8.71

Muscle architecture of the vastus lateralis (midway between the lateral condyle and greater trochanter of the femur) was determined using B-mode ultrasound as described previously (12). Ultrasound images were obtained from a linear array probe held perpendicularly for the measurement of muscle thickness and parallel for the measurement of pennation angle and fascicle length. The distance between the subcutaneous adipose tissue-muscle interface and the deep aponeurosis of the vastus lateralis was accepted as the vastus lateralis muscle thickness. Pennation angle was determined as the angle between the echo from the deep aponurosis of the vastus lateralis and the interspaces among the fascicles of the vastus lateralis. The length of the fascicle across the deep and superficial aponeurosis was directly measured using ultrasound images on a display of the ultrasound system (12).

Subcutaneous fat thickness was measured using the same ultrasound images as described above. Body density was estimated from subcutaneous fat thickness using an ultrasound-derived prediction equation (10). Percent body fat was calculated from body density using the Brozek, Grande, Anderson, and Keys’s equation (13) and was used to calculate total fat mass. Fat-free mass was calculated as the difference between body mass and total fat mass. Body mass and standing height were measured to the nearest 0.1 kg and 0.1 cm, respectively, using a stadiometer and an electronic weight scale. Body mass index was calculated as body mass (kg)/standing height squared (m2).

2.2. Body Fat and Fat-Free Mass

Standing height, body mass and body mass index were 1.84 m, 183.1 kg and 54.1 kg/m2, respectively. Ultrasound estimated percent body fat was 24.3%, and calculated fat-free mass was 138.6 kg. Several studies have investigated percent fat and fat-free mass using the underwater weighing technique on professional American football players (14), professional basketball players (14), and Japanese professional sumo wrestlers (2). The offensive linemen and defensive linemen averaged body fat percentages of 15.5% and 18.7%, respectively, with an estimated fat-free mass of 95.4 kg and 97.7 kg, respectively. The largest football player in that study had 107 kg of fat-free mass (14). A professional basketball player who played the center position had 100.7 kg of fat-free mass (15). Similarly, seven elite Japanese professional sumo wrestlers averaged 26.1% of percent body fat and 109 kg of fat-free mass. The largest fat-free mass in the sumo wrestlers was 121.3 kg, which was the largest fat-free mass value in the published literature (2). Compared with the previously published data, the 138.6 kg of fat-free mass in this case study was approximately 17 kg higher than that of the previously reported sumo wrestler (2).

2.3. Muscle Mass and Powerlifting Performance

In this study, total SM and SM index were 58.0 kg and 17.2 kg/m2, respectively. Recently, we have reported on the relationship between SM index and body mass in male athletes and recreationally active men. The relationship was parabolic, reaching a plateau (approximately 17 kg/m2) beyond 120 kg of body mass (5). Only four of the 95 large-sized male athletes had a SM index of more than 15 kg/m2 (5). Further, our previous study investigating the SM of 20 elite male powerlifters (including 7 world and/or national champions) reported that the six super-heavyweight powerlifters averaged 51.6 (SD 4.3) kg for total SM and 15.4 (SD 1.2) kg/m2 for SM index, with the largest athlete being at 59.3 kg and 16.5 kg/m2, respectively (1). Thus, the SM and SM index values of the powerlifter reported in this case study are close to the highest values in the published literature.

Using this lifter’s most recent competition, we calculated the powerlifting performance per unit of SM (kg). His relative strength was 8.10 kg/kg for the squat, 4.18 kg/kg for the bench press, and 6.51 kg/kg for the deadlift. For comparison, the average values of the six heavyweight powerlifters reported previously were 6.95 kg/kg, 4.84 kg/kg, and 6.33 kg/kg, respectively (1). Thus, the powerlifter in this case study not only had high levels of absolute muscular strength but also had high levels of relative strength per unit SM, particularly in the squat.

2.4. Muscle Architecture

The muscle thickness, pennation angle and fascicle length of the vastus lateralis was 4.2 cm, 30 degrees and 8.2 cm, respectively. A previous study reported that seven heavyweight powerlifters averaged 3.7 cm for muscle thickness, 24 degrees for the pennation angle and 9.1 cm for fascicle length in the vastus lateralis (16). On the other hand, mean values of untrained young men were 2.3 - 2.4 cm for muscle thickness, 18 - 20 degrees for pennation angle and 6.9 - 7.2 cm for fascicle length in the vastus lateralis (17, 18). The powerlifter in the current investigation had a greater pennation angle of the vastus lateralis compared to previously reported heavyweight powerlifters (16) and untrained men (17, 18). Kawakami and colleagues (9) studied approximately 700 individuals (aged 3 - 94 years, including normal individuals and highly trained bodybuilders) and reported a range of muscle thickness (1.2 - 4.5 cm) and pennation angles (9 - 33 degrees) of the vastus lateralis. In this case study, the lifter approached the maximal values reported by Kawakami et al. (9) for both muscle thickness and pennation angle. These findings suggest that a very large vastus lateralis may be more related to an increase in pennation angle rather than fascicle length.