Exact calculation of the Dodge-Romig LTPD single sampling plans for inspection by variables

Acceptance sampling, LTPD plans, Inspection by variables, Software Mathematica,

Influence of acute eccentric exercise on the H:Q ratio

The purpose of the present study was to examine the effects of an acute bout of eccentric exercise on maximal isokinetic concentric peak torque (PT) of the leg flexors and extensors and the hamstrings-to-quadriceps (H:Q) strength ratio. Sixteen male (mean±SD: age=20.9±2 years; stature=177.0±4.4 cm; mass=76.8±10.0 kg) volunteers performed maximal, concentric isokinetic leg extension and flexion muscle actions at 60°·sec − 1 before and after (24–72 h) a bout of eccentric exercise. The eccentric exercise protocol consisted of 4 sets of 10 repetitions for the leg press, leg extension, and leg curl exercises at 120% of the concentric one repetition maximum (1-RM). The results indicated that the acute eccentric exercise protocol resulted in a significant (P\u3c0.05) decrease in isokinetic leg flexion (13–19%) and leg extension (11–16%) PT 24–72 h post-exercise. However, the H:Q ratios were unaltered by the eccentric exercise protocol. These findings suggest that an acute bout of eccentric exercise utilizing both multi – and single – joint dynamic constant external resistance (DCER) exercises results in similar decreases in maximal isokinetic strength of the leg flexors and extensors, but does not alter the H:Q ratio

The effect of muscle recovery drinks on peak torque following an eccentric exercise bout

PURPOSE: The purpose of this study was to exam the effects of consuming a protein drink containing a blend of whey protein (PRO) or an amino acid (AA) drink on muscle recovery following an intense bout of lower body eccentric exercise on leg extension and leg flexion peak torque (PT). METHODS: Twenty four male subjects volunteered to participate in this study. The subjects were randomly assigned to either the PRO (n=8, age=20.1+2.2 yrs, weight=84.7+13.8 kg, height=176.1+7.4 cm) AA (n=8, age=18.8+0.7 yrs, weight=78.1+ 14.8 kg, height=176.8+4.1 cm) or PL (n=8, age=20.8+2.5 yrs, weight=73.6+8.3 kg, height=176.1+4.1 cm) group. The study was approved by the university Institutional Review Board and each subject completed an informed consent and health history questionnaire. The subjects reported to the laboratory to perform strength testing on the dominant limb of the lower extremity in order to determine their one repetition maximum (1RM) for leg press, leg extension, and leg flexion. The subjects returned to perform three sets of three maximal leg extensions and flexions at 60 degrees per second on an isokinetic machine in order to determine baseline leg extension/flexion peak torque. Five days later the subjects were lead through a unilateral (dominant limb) high intensity eccentric resistance training protocol in order to elicit muscle soreness. Immediately following the exercise session the subjects received either the PRO, AA, or PL. Subjects then returned to the lab day 1, 2, 3, and 4 post eccentric training for isokinetic strength testing at 60 degrees per second (just like baseline testing mentioned above 3 sets of 3 reps). Immediately following each test session the subjects consumed their assigned drinks. RESULTS: Two (leg extension PT and leg flexion PT) group × time repeated measures ANOVA resulted in a non significant (p\u3e0.05) group × time interaction with a significant (p\u3c0.05) main effect for time. Therefore, the results of this study indicated that the subjects all recovered at an equally independent of their group assignment. CONCLUSIONS: In conclusion, the supplementation of either PRO or AA following a high intensity bout of lower body eccentric exercise did not significantly improve peak torque for leg flexion or leg extension when compared to the PL group