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BACKGROUND: An advantage that deadlift (DL) has over back squat (BSQ) is that the latter requires additional equipment (i.e., squat rack). Accordingly, if DL can lead to positive effects on jumping, acceleration, and change of direction, DL could present as a more practical training exercise than that of BSQ. OBJECTIVE: This study aimed to compare the effects of DL and BSQ on jumping, acceleration, and change of direction. METHODS: Twenty-three men (12 in the DL group [age: 20.3 ± 1.4 years old, height: 169.6 ± 6.7 cm, body weight: 65.7 ± 11.2 kg] and 11 in the BSQ group [age: 20.2 ± 1.9 years old, height: 171.5 ± 4.8 cm, body weight: 70.1 ± 6.8 kg]) participated in this study. The participants performed five repetitions maximum (RM) of DL and BSQ, and the isokinetic strength of hip joint extension, muscle thickness of the gluteus maximus and hamstrings, countermovement jump (CMJ) height, 10 m sprint time, and T-test results were measured. The 1RM was estimated using the 5RM and normalized to body weight (BW). Both groups performed supervised DL and BSQ training for eight sessions. RESULTS: There were significant improvements on 1RM DL/BW (p < 0.01), 1RM BSQ/BW (p < 0.01), and 10 m sprint (p < 0.01) in the two groups. The effect sizes (d) of the DL and BSQ groups were 2.01 and 1.04 for 1RM DL/BW, 1.08 and 2.08 for 1RM BSQ/BW, 0.35 and 0.11 for CMJ height, and - 0.94 and - 0.54 for 10 m sprint, respectively. CONCLUSIONS: DL training might improve jumping and acceleration compared to those of BSQ training. [ABSTRACT FROM AUTHOR]

The article discusses a study that examines the test-retest reproducibility of a 5-repetition maximum (5-RM) strength test in older adults. Twenty-eight elderly people older than 60 years and with three months of strength training experience passed a 5-RM strength test. The high test-retest reproducibility was shown by the narrow limits of agreements. The study concluded that the 5-RM strength test can be utilized in sports practice for theoretical and practical purposes.

The aim of the study was to determine whether forearm muscle strength correlates with sport climbing performance. Three different movements of the forearm musculature in 25 recreational climbers (performance on sight (os) style mean F7a+, range 6b+ – 7c; red point (rp) style 7b+, range 7a – 8b+) were examined. A special isokinetic device was built to investigate eccentric and concentric isokinetic maximum strength of wrist (wr) flexion, proximal interphalangeal joint (pi) flexion of the middle- and ringfinger and a "rolling in a bar" movement involving both interphalangeal joints and the metacarpophalangeal joint (ro) of all fingers. There was no correlation between absolute maximum strength and climbing performance. Relative strength (strength/body weight) of all three exercises however correlated significantly with climbing difficulty of rp and os style, except pi flexion and os style. Correlation coefficient was highest between rp and concentric wr flexion. Among forearm musculature concentric wrist flexion was the best predictor for sport climbing performance. [ABSTRACT FROM AUTHOR]